Acceleration is the change of

1. speed and direction

2. work and distance

3. speed and distance

4. time given to work

How does an electric motor use magnetic force to produce motion? A. The north pole of a permanent magnet placed in the center of an electromagnet attracts the north pole of the electromagnet. B.

A block of mass m is pushed a horizontal distance D from position A to position B, along a horizontal plane with friction coefficient µ. Then the mass is pushed from B to A.

In an old house, the heating system uses radiators, which are hollow metal devices through which hot water or steam circulates. In one room the radiator has a dark color (emissitivity = 0.830). It has a temperature of 64.1 oC.

What is responsible for the hole in the ozone layer?

An airplane travels 80 m/s as it makes a horizontal circular turn which has a 0.80-km radius. What is the magnitude of the resultant force on the 75-kg pilot of this airplane?

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force exerted on a 0.0300-kg bullet to accelerate it to a speed of 600 m/s in a time of 2.00 ms (milliseconds) ?

Why are the sedimentary layers at capitol reef tilted?

What do we call it when an object exerts force on another for a short period of time? * Momentum Work Impulse Friction

Why is flammability a chemical property?

Luke pulls a sled using a force of 65 N for a distance of 25 m across level ground. The rope Luke pulls forms an angle of 25° with the ground. About how much work does Luke do on the sled? 250 J 690 J 1,500 J 1,600 J