A railway train 50 m long passes over a bridge 250 m long at the rate of 12 km/h.How long will it take completely pass over the bridge?
An automobile engine exerts a force of 595 N to propel the car at 90.0 km/h on a level road. What is the power output of the engine at that time?
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.
Kelly carried a box weighing 10 N the 200 meters from his car to his new house. George took the box from Kelly and carried it up the 3 meter tall flight of stairs. Who did more work?
within a book on a desk, there are billions of forces pushing and pulling on all the molecules. why is it these forces never by chance add up to a net force in one direction, causing the book to accelerate "spontaneously" across the desk?
A crane does 62,500 joules of work to lift a boulder a distance of 25.0 meters. How much did the boulder weight
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?
Can you explain that gravity pulls us to the Earth & can you calculate weight from masses on both on Earth and other planets?
