An astronaut lands on a new planet. The new planet’s mass is half that of the Earth and the new planet’s radius is half that of the Earth. If he weighs 500 N on Earth, what will the force of gravity be on him on the new planet?
Predict what the MASS would be of something exerting a force of 45N on a spring scale. EXPLAIN how you got your answer.
When a wave enters a new medium, it may speed up or slow down. What other properties of the wave do you think might change when it enters a new medium?
A man plans to use a 2 metre crowbar to lift a rock by putting a pivot 0,8 m from the rock. One end of the crowbar will be under the rock and he will push down on the other end with a force of 400 N. The mass of the rock is 50 kg. 1.Will the man be able to move the rock? Show how you worked out your answer. 2.The man’s daughter says that she can move the rock although her force on the other end is only 200 N. Explain how this is possible
A body of mass 40kg is accelerating at a rate of 9m/s² . What is the rate of change of linear momentum?
Fill the blank, please: ....is the transfer of thermal energy between particles of matter that are touching.
A police dog gets caught in a shootout. A 5 g bullet moving at 100 m·s–1 strikes the dog and lodges in his shoulder. Fortunately the dog survives. The bullet undergoes uniform acceleration and penetrates his shoulder to a depth of 6 cm. Calculate the time taken for the bullet to stop
