Physics teacher, Mr. McKee, shoots a .22 caliber rifle at a .30 kg block of wood. The rifle and the wood are mounted on carts that sit on air track, as shown, so that friction is negligible. The 6.0 kg gun fires a 0.020 kg bullet with a speed of 200 m/s. a) what is the final velocity of the block of wood with the bullet lodged inside?

b) what is the recoil velocity of the gun?

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.