Which example is a naturally occurring magnet

A a nail

B a piece of iron

C aluminum

D earth

Jim (mass=100kg) rollerblades on a smooth horizontal floor at a constant speed of 2.0 m/s for a distance of 5m in 5 seconds. What is the power in this process? (assume g is 10 m/s^2)

A 50.0 g projectile is launched with a horizontal velocity of 657 m/s from a 4.65 kg launcher moving in the same direction at 2.00 m/s. What is the launcher's velocity after the launch?

If PEs represents the potential energy stored in a spring in kg. m^2 / s2, and x represents the change in spring length from its equilbrium position in m, what is the unitfor the spring constant k in the formula PEs = 1/2 kx^2

Which of the following changes igneous or sedimentary rock into metamorphic rock? A. heat and pressure B. heat and weathering C. water and weathering D. water and pressure

Explain why a fast moving freight train cannot be stopped quickly

Velocity is: а - speed and direction. b - distance divided by time. c - always the same as speed. distance multiplied by time. d - distance multiplied by time

The gauge pressure in each of the four tires of an automobile is 230 kpa. if each tire has a "footprint" of 180 cm2 (area touching the ground), determine the mass of the car.

A bus travels 20 KM and 30 minutes what is average speed of the bus

What is the total number of atoms in the following formula? CaBr2

A lifeguard on a beach observes that waves have a speed of 7 m/s and a distance of 4.6m between wave crests. what is the period of the wave motion?