Why aren’t hydrogen fuel cell cars currently available to the public? they produce more noise pollution than other cars. they have had unpredictable electrical problems. they have not yet been driven over long distances. they require more testing in real-world conditions.

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

The act of moving from one place to another. a. locomotor b. aerobic c. stationary d. static

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?