A bag is dropped from a hovering helicopter. After 42.4s, calculate the bag's displacement.

What would we observe on earth if the sun's internal energy source suddenly shut off?

A railway wagon of mass 20t is moving along a level track at 10km/h when it collides and couples together with a second wagon of mass 25t moving in the same direction at 5km/h.

A mover brings a box up the stairs in 10 seconds. If he applied a force of 20 N over a distance 10 m on the box, calculate the power required for him to complete this action. 0.05 watts 201 watts 2,000 watts 20 watts

Which of the following is NOT a way that machines provide a mechanical advantage? a. change direction b. change distance c. change power d. change force

What causes a tsunami to grow taller as it reaches the shore?

How can we describe an atom

What is the volume of a gold nugget that weight 2.20kg. the density of gold is 19g/cm^3 ... ?

Explain how newton's first law of motion can be considered to be a consequence of newton's second law.

Propose a hypothesis for how the position of the ball will affect the amount of its gravitational pull energy

A water-skier is pulled behind a boat by a rope that is at an angle of 13° and has a tension of 490 N. The water-skier has a mass of 49 kg. Draw a free-body diagram showing the forces acting on the skier. (She is being pulled to the right.)