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Questions in physics

[Answered] Who invented the prism?

[Answered] Within a book on a desk, there are billions of forces pushing and pulling on all the molecules. Why do these forces never by chance add up to a net force in one direction, causing the book to accelerate "spontaneously" across the desk?

[Answered] Kelly carried a box weighing 10 N for 200 meters from his car to his new house. George then took the box from Kelly and carried it up a 3-meter tall flight of stairs. Who did more work?

[Answered] A 700-watt gasoline engine and a 300-watt electric motor both do 3 J of work. Which machine can do the work faster? Explain your answer.

[Answered] Define the efficiency of an energy converter.

[Answered] A crane does 62,500 joules of work to lift a boulder a distance of 25.0 meters. How much did the boulder weigh?

[Answered] A pendulum is dropped 0.50 m from the equilibrium position as shown below. What is the speed of the pendulum bob as it passes through the equilibrium position?

[Answered] Can you explain that gravity pulls us to the Earth, and can you calculate weight from masses both on Earth and on other planets?

[Answered] What two things affect the gravitational force acting on an object?

[Answered] How do you relate and explain a planet's distance from the Sun to factors like the length of its year and its average temperature?