The temperature of an object is an indicator of the average kinetic energy of its molecules; option [D]. It represents the measure of the average energy associated with the random motion of molecules within the object. This kinetic energy determines the object's temperature, which can be measured usRead more
The temperature of an object is an indicator of the average kinetic energy of its molecules; option [D]. It represents the measure of the average energy associated with the random motion of molecules within the object. This kinetic energy determines the object’s temperature, which can be measured using various scales such as Celsius or Kelvin. The temperature reflects the distribution of kinetic energies among the molecules, providing valuable information about the thermal state of the object. Therefore, the correct option is [D] The average kinetic energy of its molecules, as temperature directly correlates with the average kinetic energy of the particles within the object. This fundamental relationship between temperature and kinetic energy is crucial in understanding the behavior of matter and its thermal properties, influencing various physical and chemical processes in nature and technology.
The temperature of an object indicates that on contact, heat will flow from that object to an object at a higher temperature; option [A]. This is governed by the fundamental principle of thermodynamics known as the second law, which states that heat naturally transfers from regions of higher temperaRead more
The temperature of an object indicates that on contact, heat will flow from that object to an object at a higher temperature; option [A]. This is governed by the fundamental principle of thermodynamics known as the second law, which states that heat naturally transfers from regions of higher temperature to regions of lower temperature until thermal equilibrium is achieved. Heat flow occurs spontaneously in this direction, driving processes such as conduction, convection, and radiation. Therefore, when two objects of different temperatures come into contact, heat energy will transfer from the hotter object to the cooler one until they reach the same temperature. This process continues until both objects attain thermal equilibrium, where there is no net heat transfer between them. Thus, the correct option is [A] flow from that object to an object at a higher temperature, reflecting the established principles of heat transfer and thermodynamics.
If a body is thrown from the Earth with a velocity of 11.2 km per second, then the body will never return to the Earth; Option [A]. This velocity exceeds the escape velocity of Earth, ensuring that the body will continue moving away from Earth indefinitely, unable to return due to the gravitationalRead more
If a body is thrown from the Earth with a velocity of 11.2 km per second, then the body will never return to the Earth; Option [A]. This velocity exceeds the escape velocity of Earth, ensuring that the body will continue moving away from Earth indefinitely, unable to return due to the gravitational pull. The escape velocity of Earth, approximately 11.2 km/s at the Earth’s surface, represents the minimum speed required for an object to break free from Earth’s gravitational field and enter space. Once a body achieves or exceeds this velocity, it is no longer bound by Earth’s gravity and will not return. Therefore, option A, “Never return to the Earth,” is the correct answer. This principle is fundamental to understanding space travel and celestial mechanics, as it governs the conditions under which objects can escape from planetary bodies and explore the cosmos. In summary, a body thrown from Earth with a velocity of 11.2 km/s will not return, as it has achieved escape velocity and will continue its journey away from Earth indefinitely.
When a stone is brought from the surface of the moon to the Earth, its mass remains constant; option [B]. Mass is an intrinsic property of an object, representing the amount of matter it contains, and it does not change regardless of the gravitational environment. However, its weight will change dueRead more
When a stone is brought from the surface of the moon to the Earth, its mass remains constant; option [B]. Mass is an intrinsic property of an object, representing the amount of matter it contains, and it does not change regardless of the gravitational environment. However, its weight will change due to the difference in gravitational acceleration between the moon and the Earth. Weight is the force exerted by gravity on an object and is calculated by multiplying mass by the gravitational acceleration. Since the gravitational acceleration on the Earth is stronger than that on the moon, the stone’s weight will increase when brought to Earth. This change in weight occurs because weight is dependent on both mass and the strength of the gravitational field. Therefore, the correct answer is option [B]. Its weight will change, but not the mass. This distinction between mass and weight is fundamental in physics and is essential for understanding how objects behave in different gravitational environments.
A person sitting in a lift feels that their weight is more when the lift is going up at an accelerated speed, which is; option [B]. This sensation occurs due to the interplay between gravitational force and the lift's acceleration. When the lift accelerates upward, the floor exerts an additional forRead more
A person sitting in a lift feels that their weight is more when the lift is going up at an accelerated speed, which is; option [B]. This sensation occurs due to the interplay between gravitational force and the lift’s acceleration.
When the lift accelerates upward, the floor exerts an additional force on the person, adding to the gravitational force already acting on them. This combined force, known as apparent weight, is greater than the person’s actual weight. As a result, the person feels heavier than they would at rest or when the lift is moving at a constant velocity.
Conversely, when the lift is coming down at an accelerated speed (option A), the floor exerts less force on the person, reducing their apparent weight. Similarly, when the lift is moving at a constant velocity in either direction (options C and D), the person experiences their actual weight without the additional effects of acceleration.
Therefore, option [B] correctly identifies the scenario in which a person sitting in a lift feels that their weight is more: when the lift is going up at an accelerated speed.
The ball dropped from an artificial satellite revolving around the Earth will continue to revolve around the Earth in its orbit with the same period of time as the satellite; option [C]. This is because the ball shares the same gravitational influence and motion as the satellite. It follows the curvRead more
The ball dropped from an artificial satellite revolving around the Earth will continue to revolve around the Earth in its orbit with the same period of time as the satellite; option [C]. This is because the ball shares the same gravitational influence and motion as the satellite. It follows the curvature of Earth’s surface, remaining in orbit without falling to Earth or being pulled towards the Moon. The gravitational force between the ball and the Earth keeps it in orbit, maintaining its trajectory around the planet. As long as the satellite remains in orbit, the ball dropped from it will also remain in orbit, moving along with the satellite at the same speed and direction. Therefore, option [C] accurately describes the behavior of the ball dropped from an artificial satellite, highlighting the continuous orbiting motion governed by gravitational forces and orbital mechanics, without being affected by other celestial bodies such as the Earth or the Moon.
The approximate height of a synchronous satellite from the Earth's surface is 36,000 km, which is; option [A]. Synchronous satellites, also known as geostationary satellites, orbit the Earth at the same rate as the Earth's rotation, appearing stationary relative to a fixed point on the Earth's surfaRead more
The approximate height of a synchronous satellite from the Earth’s surface is 36,000 km, which is; option [A]. Synchronous satellites, also known as geostationary satellites, orbit the Earth at the same rate as the Earth’s rotation, appearing stationary relative to a fixed point on the Earth’s surface. This orbit is achieved when the satellite’s orbital period matches the Earth’s rotational period, which is approximately 24 hours. To maintain this synchronous orbit, the satellite must be located at a specific distance from the Earth’s surface. This distance, known as the geostationary orbit altitude, is approximately 36,000 km above the Earth’s equator. At this altitude, the satellite completes one orbit around the Earth in 24 hours, matching the Earth’s rotational period and enabling it to remain stationary relative to a fixed point on the Earth’s surface. Therefore, option A correctly identifies the approximate height of a synchronous satellite from the Earth’s surface, highlighting its significance in telecommunications, weather monitoring, and other applications requiring continuous coverage of a specific area on the Earth’s surface.
A tennis ball bounces higher on a hill than on a field because Earth's gravitational acceleration decreases on mountains, which is; option [C]. Gravitational acceleration is weaker at higher altitudes due to the greater distance from Earth's center, resulting in less downward force acting on the balRead more
A tennis ball bounces higher on a hill than on a field because Earth’s gravitational acceleration decreases on mountains, which is; option [C]. Gravitational acceleration is weaker at higher altitudes due to the greater distance from Earth’s center, resulting in less downward force acting on the ball. This reduced gravitational force allows the ball to rebound higher after each bounce compared to when it is on a field at lower elevation. Options A and B are not relevant to the increase in bounce height on a hill, as air pressure and the weight of the ball do not directly affect its bounce height in this context. Therefore, the primary reason for the higher bounce on a hill is the decrease in Earth’s gravitational acceleration at higher elevations, enabling the ball to rebound more effectively against the opposing force of gravity. Consequently, option C accurately explains the phenomenon observed when a tennis ball is bounced on a hill compared to a field.
If the gravitational force of the Earth suddenly disappears, then option [A] is correct: The weight of the object will become zero, but the mass will remain the same. Weight is the force exerted on an object due to gravity, calculated as the product of the object's mass and the gravitational accelerRead more
If the gravitational force of the Earth suddenly disappears, then option [A] is correct: The weight of the object will become zero, but the mass will remain the same. Weight is the force exerted on an object due to gravity, calculated as the product of the object’s mass and the gravitational acceleration. In the absence of gravity, weight becomes zero since there is no gravitational force acting on the object. However, mass is an intrinsic property of an object, representing the amount of matter it contains, and remains constant regardless of the gravitational field. Therefore, even without gravitational force, the object’s mass remains unchanged. Option B is incorrect because mass cannot become zero unless the object ceases to exist. Option C is incorrect because mass does not become zero. Option D is incorrect because mass does not increase due to the absence of gravitational force. Thus, option A accurately describes the consequences of the sudden disappearance of Earth’s gravitational force on an object’s weight and mass.
The fraction of the Earth's gravity that is closest to the Moon's gravity is 1/6, which is option [C]. The gravitational acceleration on the Moon's surface is approximately 1/6th of that on the Earth's surface. This means that objects on the Moon weigh approximately 1/6th of their weight on Earth. TRead more
The fraction of the Earth’s gravity that is closest to the Moon’s gravity is 1/6, which is option [C]. The gravitational acceleration on the Moon’s surface is approximately 1/6th of that on the Earth’s surface. This means that objects on the Moon weigh approximately 1/6th of their weight on Earth. The ratio of the Moon’s gravity to Earth’s gravity is commonly expressed as 1/6, making option C the most accurate choice among the provided options. This difference in gravitational acceleration is due to the Moon’s smaller mass compared to Earth, resulting in weaker gravitational attraction. Understanding this fraction is crucial for space exploration and celestial mechanics, as it influences the behavior of objects and spacecraft in lunar orbit and during lunar landings. Therefore, option C accurately represents the relationship between the Earth’s gravity and the Moon’s gravity, highlighting the significance of gravitational forces in astronomical phenomena.
What is the temperature of an object an indicator of?
The temperature of an object is an indicator of the average kinetic energy of its molecules; option [D]. It represents the measure of the average energy associated with the random motion of molecules within the object. This kinetic energy determines the object's temperature, which can be measured usRead more
The temperature of an object is an indicator of the average kinetic energy of its molecules; option [D]. It represents the measure of the average energy associated with the random motion of molecules within the object. This kinetic energy determines the object’s temperature, which can be measured using various scales such as Celsius or Kelvin. The temperature reflects the distribution of kinetic energies among the molecules, providing valuable information about the thermal state of the object. Therefore, the correct option is [D] The average kinetic energy of its molecules, as temperature directly correlates with the average kinetic energy of the particles within the object. This fundamental relationship between temperature and kinetic energy is crucial in understanding the behavior of matter and its thermal properties, influencing various physical and chemical processes in nature and technology.
See lessThe temperature of an object indicates that on contact, heat will
The temperature of an object indicates that on contact, heat will flow from that object to an object at a higher temperature; option [A]. This is governed by the fundamental principle of thermodynamics known as the second law, which states that heat naturally transfers from regions of higher temperaRead more
The temperature of an object indicates that on contact, heat will flow from that object to an object at a higher temperature; option [A]. This is governed by the fundamental principle of thermodynamics known as the second law, which states that heat naturally transfers from regions of higher temperature to regions of lower temperature until thermal equilibrium is achieved. Heat flow occurs spontaneously in this direction, driving processes such as conduction, convection, and radiation. Therefore, when two objects of different temperatures come into contact, heat energy will transfer from the hotter object to the cooler one until they reach the same temperature. This process continues until both objects attain thermal equilibrium, where there is no net heat transfer between them. Thus, the correct option is [A] flow from that object to an object at a higher temperature, reflecting the established principles of heat transfer and thermodynamics.
See lessIf a body is thrown from the Earth with a velocity of 11.2 km per second, then the body will
If a body is thrown from the Earth with a velocity of 11.2 km per second, then the body will never return to the Earth; Option [A]. This velocity exceeds the escape velocity of Earth, ensuring that the body will continue moving away from Earth indefinitely, unable to return due to the gravitationalRead more
If a body is thrown from the Earth with a velocity of 11.2 km per second, then the body will never return to the Earth; Option [A]. This velocity exceeds the escape velocity of Earth, ensuring that the body will continue moving away from Earth indefinitely, unable to return due to the gravitational pull. The escape velocity of Earth, approximately 11.2 km/s at the Earth’s surface, represents the minimum speed required for an object to break free from Earth’s gravitational field and enter space. Once a body achieves or exceeds this velocity, it is no longer bound by Earth’s gravity and will not return. Therefore, option A, “Never return to the Earth,” is the correct answer. This principle is fundamental to understanding space travel and celestial mechanics, as it governs the conditions under which objects can escape from planetary bodies and explore the cosmos. In summary, a body thrown from Earth with a velocity of 11.2 km/s will not return, as it has achieved escape velocity and will continue its journey away from Earth indefinitely.
See lessWhen a stone is brought from the surface of the moon to the Earth, then
When a stone is brought from the surface of the moon to the Earth, its mass remains constant; option [B]. Mass is an intrinsic property of an object, representing the amount of matter it contains, and it does not change regardless of the gravitational environment. However, its weight will change dueRead more
When a stone is brought from the surface of the moon to the Earth, its mass remains constant; option [B]. Mass is an intrinsic property of an object, representing the amount of matter it contains, and it does not change regardless of the gravitational environment. However, its weight will change due to the difference in gravitational acceleration between the moon and the Earth. Weight is the force exerted by gravity on an object and is calculated by multiplying mass by the gravitational acceleration. Since the gravitational acceleration on the Earth is stronger than that on the moon, the stone’s weight will increase when brought to Earth. This change in weight occurs because weight is dependent on both mass and the strength of the gravitational field. Therefore, the correct answer is option [B]. Its weight will change, but not the mass. This distinction between mass and weight is fundamental in physics and is essential for understanding how objects behave in different gravitational environments.
See lessWhen does a person sitting in a lift feel that his weight is more?
A person sitting in a lift feels that their weight is more when the lift is going up at an accelerated speed, which is; option [B]. This sensation occurs due to the interplay between gravitational force and the lift's acceleration. When the lift accelerates upward, the floor exerts an additional forRead more
A person sitting in a lift feels that their weight is more when the lift is going up at an accelerated speed, which is; option [B]. This sensation occurs due to the interplay between gravitational force and the lift’s acceleration.
When the lift accelerates upward, the floor exerts an additional force on the person, adding to the gravitational force already acting on them. This combined force, known as apparent weight, is greater than the person’s actual weight. As a result, the person feels heavier than they would at rest or when the lift is moving at a constant velocity.
Conversely, when the lift is coming down at an accelerated speed (option A), the floor exerts less force on the person, reducing their apparent weight. Similarly, when the lift is moving at a constant velocity in either direction (options C and D), the person experiences their actual weight without the additional effects of acceleration.
See lessTherefore, option [B] correctly identifies the scenario in which a person sitting in a lift feels that their weight is more: when the lift is going up at an accelerated speed.
The ball dropped from an artificial satellite revolving around the Earth
The ball dropped from an artificial satellite revolving around the Earth will continue to revolve around the Earth in its orbit with the same period of time as the satellite; option [C]. This is because the ball shares the same gravitational influence and motion as the satellite. It follows the curvRead more
The ball dropped from an artificial satellite revolving around the Earth will continue to revolve around the Earth in its orbit with the same period of time as the satellite; option [C]. This is because the ball shares the same gravitational influence and motion as the satellite. It follows the curvature of Earth’s surface, remaining in orbit without falling to Earth or being pulled towards the Moon. The gravitational force between the ball and the Earth keeps it in orbit, maintaining its trajectory around the planet. As long as the satellite remains in orbit, the ball dropped from it will also remain in orbit, moving along with the satellite at the same speed and direction. Therefore, option [C] accurately describes the behavior of the ball dropped from an artificial satellite, highlighting the continuous orbiting motion governed by gravitational forces and orbital mechanics, without being affected by other celestial bodies such as the Earth or the Moon.
See lessWhat is approximately the height of a synchronous satellite from the earth’s surface?
The approximate height of a synchronous satellite from the Earth's surface is 36,000 km, which is; option [A]. Synchronous satellites, also known as geostationary satellites, orbit the Earth at the same rate as the Earth's rotation, appearing stationary relative to a fixed point on the Earth's surfaRead more
The approximate height of a synchronous satellite from the Earth’s surface is 36,000 km, which is; option [A]. Synchronous satellites, also known as geostationary satellites, orbit the Earth at the same rate as the Earth’s rotation, appearing stationary relative to a fixed point on the Earth’s surface. This orbit is achieved when the satellite’s orbital period matches the Earth’s rotational period, which is approximately 24 hours. To maintain this synchronous orbit, the satellite must be located at a specific distance from the Earth’s surface. This distance, known as the geostationary orbit altitude, is approximately 36,000 km above the Earth’s equator. At this altitude, the satellite completes one orbit around the Earth in 24 hours, matching the Earth’s rotational period and enabling it to remain stationary relative to a fixed point on the Earth’s surface. Therefore, option A correctly identifies the approximate height of a synchronous satellite from the Earth’s surface, highlighting its significance in telecommunications, weather monitoring, and other applications requiring continuous coverage of a specific area on the Earth’s surface.
See lessA tennis ball bounces higher on a hill than on a field because
A tennis ball bounces higher on a hill than on a field because Earth's gravitational acceleration decreases on mountains, which is; option [C]. Gravitational acceleration is weaker at higher altitudes due to the greater distance from Earth's center, resulting in less downward force acting on the balRead more
A tennis ball bounces higher on a hill than on a field because Earth’s gravitational acceleration decreases on mountains, which is; option [C]. Gravitational acceleration is weaker at higher altitudes due to the greater distance from Earth’s center, resulting in less downward force acting on the ball. This reduced gravitational force allows the ball to rebound higher after each bounce compared to when it is on a field at lower elevation. Options A and B are not relevant to the increase in bounce height on a hill, as air pressure and the weight of the ball do not directly affect its bounce height in this context. Therefore, the primary reason for the higher bounce on a hill is the decrease in Earth’s gravitational acceleration at higher elevations, enabling the ball to rebound more effectively against the opposing force of gravity. Consequently, option C accurately explains the phenomenon observed when a tennis ball is bounced on a hill compared to a field.
See lessIf the gravitational force of the Earth suddenly disappears, then which of the following results will be correct?
If the gravitational force of the Earth suddenly disappears, then option [A] is correct: The weight of the object will become zero, but the mass will remain the same. Weight is the force exerted on an object due to gravity, calculated as the product of the object's mass and the gravitational accelerRead more
If the gravitational force of the Earth suddenly disappears, then option [A] is correct: The weight of the object will become zero, but the mass will remain the same. Weight is the force exerted on an object due to gravity, calculated as the product of the object’s mass and the gravitational acceleration. In the absence of gravity, weight becomes zero since there is no gravitational force acting on the object. However, mass is an intrinsic property of an object, representing the amount of matter it contains, and remains constant regardless of the gravitational field. Therefore, even without gravitational force, the object’s mass remains unchanged. Option B is incorrect because mass cannot become zero unless the object ceases to exist. Option C is incorrect because mass does not become zero. Option D is incorrect because mass does not increase due to the absence of gravitational force. Thus, option A accurately describes the consequences of the sudden disappearance of Earth’s gravitational force on an object’s weight and mass.
See lessWhat fraction of the Earth’s gravity is closest to the Moon’s gravity?
The fraction of the Earth's gravity that is closest to the Moon's gravity is 1/6, which is option [C]. The gravitational acceleration on the Moon's surface is approximately 1/6th of that on the Earth's surface. This means that objects on the Moon weigh approximately 1/6th of their weight on Earth. TRead more
The fraction of the Earth’s gravity that is closest to the Moon’s gravity is 1/6, which is option [C]. The gravitational acceleration on the Moon’s surface is approximately 1/6th of that on the Earth’s surface. This means that objects on the Moon weigh approximately 1/6th of their weight on Earth. The ratio of the Moon’s gravity to Earth’s gravity is commonly expressed as 1/6, making option C the most accurate choice among the provided options. This difference in gravitational acceleration is due to the Moon’s smaller mass compared to Earth, resulting in weaker gravitational attraction. Understanding this fraction is crucial for space exploration and celestial mechanics, as it influences the behavior of objects and spacecraft in lunar orbit and during lunar landings. Therefore, option C accurately represents the relationship between the Earth’s gravity and the Moon’s gravity, highlighting the significance of gravitational forces in astronomical phenomena.
See less