A210w heater is placed in 2kg of water and switched on for 200 seconds.
a. how much energy is needed to raise the temperature of 2kg of water by 10c?
b. how much energy does the heater supply?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.