Which event is an example of a contact force?

A.

a nail being attracted to a magnet

B.

a leaf falling from a tree

C.

an electric charge jumping from a sweater to a person

D.

a person pulling a sled

What is the recommended amount of time that a teenager should be participating in physical activity A: 30 min B: 60 min C: 45 min D: 15 min

What is the force when an object exerts 15 pascal pressure on a square surface of side 5 meters

A child in a boat throws a 5.10-kg package out horizontally with a speed of 10.0 m/s. the mass of the child is 27.6 kg and the mass of the boat is 34.2 kg calculate the velocity of the boat immediately after, assuming it was initially at rest.

Valleys form mainly from

What do radio waves and microwaves have in common? A) Both are found next to visible light on the electromagnetic spectrum. B) Both are at the side of the spectrum with the lowest frequency.

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion

How many neutrons are in Cesium-130

You are standing outside during the daytime. How can you see a blade of grass? A. Light is produced by your eyes and travels out to the grass. B. Light is produced by the grass and travels straight to your eyes. C.

Are cosmic rays and gamma rays invisible or do they have color?