(Answered) 1 do heavier objects fall more slowly than lighter

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1. Do heavier objects fall more slowly than lighter objecets?

2. Why do objects float in liquids denser than themselves?

3. A particle is moving around in a circle and its position is given in polar coordinates asx=Rcosθ, andy=Rsinθ, whereRis the radius of the circle, andθis in radians.From these equations derive the equation for centripetal acceleration.

4. How come in free fall you feel weightless even though gravity is pulling down on you? (ignore air resistance when answering this question).

5. What is the difference between centripetal acceleration and centrifugal force?

6. What is the difference between energy and power?

7. Two identical cars collide head on. Each car is traveling at 100 km/h. The impact force on each car is the same as hitting a solid wall at:

(a) 100 km/h

(b) 200 km/h

(d) 50 km/h

8. Why is it possible to drive a nail into a piece of wood with a hammer, but it is not possible to push a nail in by hand?

9. An archer pulls back 0.75 m on a bow which has a stiffness of 200 N/m. The arrow weighs 50 g. What is the velocity of the arrow immediately after release?

10. When a moving car encounters a patch of ice the brakes are applied. Why is it desirable to keep the wheels rolling on the ice without locking up?

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