On heating an object, the speed of its molecules will increase. Heating transfers thermal energy to the molecules, causing them to move more rapidly; option [A]. This increase in molecular motion results in a rise in temperature and expansion of the object. Therefore, the correct option is [A] willRead more
On heating an object, the speed of its molecules will increase. Heating transfers thermal energy to the molecules, causing them to move more rapidly; option [A]. This increase in molecular motion results in a rise in temperature and expansion of the object. Therefore, the correct option is [A] will increase, aligning with the principles of kinetic theory, which state that the average kinetic energy of molecules in a substance is directly proportional to its temperature. As the molecules gain energy, they move faster, leading to an increase in speed. This phenomenon is observed in various contexts, from the expansion of gases to the melting of solids and the vaporization of liquids. Thus, heating induces greater molecular motion, demonstrating the relationship between thermal energy and the speed of molecules in a substance.
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.
On heating an object, the speed of its molecules
On heating an object, the speed of its molecules will increase. Heating transfers thermal energy to the molecules, causing them to move more rapidly; option [A]. This increase in molecular motion results in a rise in temperature and expansion of the object. Therefore, the correct option is [A] willRead more
On heating an object, the speed of its molecules will increase. Heating transfers thermal energy to the molecules, causing them to move more rapidly; option [A]. This increase in molecular motion results in a rise in temperature and expansion of the object. Therefore, the correct option is [A] will increase, aligning with the principles of kinetic theory, which state that the average kinetic energy of molecules in a substance is directly proportional to its temperature. As the molecules gain energy, they move faster, leading to an increase in speed. This phenomenon is observed in various contexts, from the expansion of gases to the melting of solids and the vaporization of liquids. Thus, heating induces greater molecular motion, demonstrating the relationship between thermal energy and the speed of molecules in a substance.
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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.
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