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Questions in physics

📝 Answered - Which of the following work is done by effort? A) input work B) output work C) resultant work D) useful work Which of the following has 100% efficiency? A) hydraulic machine B) perfect machine C) simple machine D) compound machine Velocity ratio of which machine is given by [tex]$\frac{l}{h}$[/tex]? A) lever B) inclined plane C) pulley D) wheel and axle

📝 Answered - Which theory is supported most by the finding that the moon is similar in composition to the outer portions of Earth? A. Impact theory B. Synchronous theory C. Capture theory D. Co-formation theory

📝 Answered - How does Newton's Third Law apply when you push a heavy object? A. The object pushes back with an equal and opposite force. B. The object moves with no reaction force. C. The object pulls you toward it with greater force. D. The object does not move because the forces cancel out.

📝 Answered - Which change will always result in an increase in the gravitational force between two objects? A. Increasing the masses of the objects and increasing the distance between the objects B. Decreasing the masses of the objects and decreasing the distance between the objects C. Increasing the masses of the objects and decreasing the distance between the objects D. Decreasing the masses of the objects and increasing the distance between the objects

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - What causes an electrical charge? A. Protons moving between objects B. Neutrons moving between objects C. Electrons moving between objects.

📝 Answered - Check all the examples of capillary action. Select all correct options: * water collecting on a penny and not spreading * water climbing up a paper towel when the corner is placed in water * paper clips floating on the top of water if placed carefully * water being pulled up to the tops of trees

📝 Answered - What type of heat transfer heats the air in our homes? A. radiation B. conduction C. convection

📝 Answered - How does the electric force between two charged particles change if the distance between them is reduced by a factor of 2? A. It is reduced by a factor of 4. B. It is increased by a factor of 2. C. It is reduced by a factor of 2. D. It is increased by a factor of 4.