4. How much force is required to stop a 60 kg person traveling at 30 m/s during a time of a)

5.0 seconds

b) 0.50 seconds

c) 0.05 seconds

A 3.5-kg rifle fires a 15-g bullet at 840 m/s. With what speed does the rifle recoil (move backward toward the shooter's shoulder) ?

How much heat is needed to raise the temperature of 5g of water by 19oC?

A 200 kg crate is pulled along a level surface by an engine. the coefficient of friction between crate and surface is 0.4. a. how much power must the engine deliver to move the crate at 5.0m/s. b. how much work is done by the engine in 180s

How do polar bears use albedo to survive

The force that keeps two surfaces at rest from sliding over each other is

What type of energy comes from the food that we eat?

Which of the following are vector quantities? check all that apply. a. time b. displacement c. force d. mass

Imagine you are on a bus with a helium balloon tied on a string tied to the seat in front of you. the bus stops short to avoid running over a rabbit and you are thrown forward. what happens to the balloon in relation to the bus? 1. the balloon pops.

Give one reason why the density of iron is higher than the density of oxygen

In which region of the periodic table do the elements NOT normally react chemically with other elements? A. metals B. metalloids C. nonmetals D. noble gases