Can kintic friction affect mechanical energy

A runner in a relay race runs 20 m north, turns around and runs south for 30 m, then turns north again and runs 40 m. The entire run took 30 seconds. Draw a sketch. What was the average speed of the runner?

If you hear a higher pitch from a clarinet than from a saxophone, how do the frequencies of the sound waves from the clarinet compare to those of the saxophone? A - The saxophone's waves have a higher frequency than the clarinet.

How does shooting a shotgun related to Newton's third law

When an electric drill is used to bore a hole into a wooden beam, the user notices that the drill bit gets very hot. Explain why the drill bit gets hot when it is turning in the wood.

An object moving with a speed of 35 m/s and has a kinetic energy of 1500 J, what's the Mass

3. A 120.0 V generator supplies 3.0 kw of power. How much current ca the generator deliver?

An apple drops from a tree and hits the ground in 1.5s what is its speed just before it hits the ground?

Sound travels slow in cold air. Why does the speed of sound depend on air temperature?

A tow truck pulls a 500 kg car so that the car accelerates 2 m/s2. What is the net force on the car? 250 N 498 N 1000 N 502 N

Which force keeps you near earths surface?