Explain why you can hear your friends talking in a classroom before you turn the corner.

If a train and a car are traveling at the same speed they have the same amount of kinetic energy? True or false

A block weighing 10 newtons is resting on a plane inclined 30° to the horizontal. What is the magnitude of the normal force acting on the block? Round your answer to the nearest whole number.

Suppose you were bungee jumping from a bridge while blowing a hand-held air horn. How would someone remaining on the bridge hear the pitch of the air horn as time increased? a. The pitch would get progressively lower (i. e., smaller frequency) b.

An airplane traveling north at 220. Meters per second encounters a 50.0-meters-per-second crosswind from west to east What is the resultant speed of the plane?

What are 2 key differences between electric force and gravitational force?

Two railroad cars, each of mass 6500 kg and traveling 80 km/h in opposite directions, collide head-on and come to rest. how much thermal energy is produced in this collision?

What is a result of using a machine?

A boy rides motorbike with velocity of 20 m/s He accelerates his motorbike to a velocity of 30 m/s for 5 second. Calculate the acceleration produced in the motorbike. [Ams 2ms

How is a star's emission spectrum used to study stars?

A 52.0 kg skateboarder does a trick on a half-pipe. During the trick, he reaches a speed of 8.90 m/s. The radius of the half-pipe ramp is 3.00 meters. What is the minimum centripetal force necessary to keep the skater on the ramp?