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.
When 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 less