Question : If both the mass and the velocity of a body are increased to twice their magnitude, the kinetic energy will increase by:
Option 1: 2 times
Option 2: 4 times
Option 3: 8 times
Option 4: 16 times
Correct Answer: 4 times
Solution : The correct option is 4 times.
The kinetic energy of a body rises by a factor of 4 when both its mass and velocity are raised to twice its magnitude. The equation for kinetic energy, KE = 1/2 * m * v2, may be used to explain this. It takes into account the body's mass, velocity, and kinetic energy. The new kinetic energy of the body may be estimated as follows if both its mass and speed are doubled: The body's new mass is 2 meters. The body's new velocity is 2v. These numbers are substituted in the kinetic energy calculation to provide KE = 1/2 * (2m) * (2v)2 = 4 * (1/2 * m * v)2 = 4 * KE.
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Question : The work done by the string of a simple pendulum during one complete oscillation is equal to
Option 1: The total energy of a pendulum
Option 2: Kinetic energy of the pendulum
Option 3: Potential energy of the pendulum
Option 4: Zero
Question : Gliders depend on the following energy for their flight:
Option 1: wind energy
Option 2: electrical energy
Option 3: heat energy
Option 4: chemical energy
Question : One calorie of heat energy is equivalent to approximately ____________ joules of mechanical energy.
Option 1: 0.24
Option 2: 0.48
Option 3: 2.4
Option 4: 4.2
Question : Which of the following is the correct statement?
Option 1: Joule is the unit of work
Option 2: The unit of energy is the watt.
Option 3: Joule/ second is also a unit of energy.
Option 4: The unit of power is joule/newton.
Question : Select the most appropriate option to fill in the blank.
After a tiring day, the workers decided to ____________ to restore their energy.
Option 1: have an axe to grind
Option 2: put a spoke in the wheel
Option 3: bring to book
Option 4: hit the sack
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