Jenny is sitting on a sled on the side of a hill inclined at 15°. What force is required to keep the sled from sliding down the

hill if the combined weight of Jenny and the sled is 90 pounds?

Which would show an example of how physical changes are reversible?

Does the electric field depend on area?

Scott is making a chart to show the difference between chemical reactions and nuclear reactions. Which part of his chart is incorrect?

Differences between gamma rays and microwaves

A spring is stretched from equilibrium to 0.90 m, and the work done on the spring equals 18 J. What is the value of the spring constant?

Show that the units N/kg can be written using only units of meters (m) and second (s). Is this a unit of mass, acceleration or force.

Following an inelastic collision, what can kinetic energy be converted into? Check all that apply. heat impulse momentum potential energy sound

A potato has a volume of 750cubic centimeters and a mass of 390grams. Calculate its density. Write your answer to the hundredths place.

You could increase the mechanical efficiency of this screw by

While riding in your boat, you notice one wave pass by every two seconds. If the actual frequency of the waves is 1 Hz, with what speed are you moving through the water? (The speed of the waves is 5 m/sec.) A. 1m/2s towards the waves B.