What is the velocity (in m/s) of a 550 kg roller coaster cart at the bottom of the track if it started with 990,000 J of gravitational potential energy at the top of the track? Assume a frictionless surface.

You are driving at 90 km/h. How many meters are you covering per second?

Explain why semiconductors, or metalloids, deserve their name.

Describe two ways to change the frictional force between two solid surfaces.

What is the density of a brick with a volume of 0.0010 m3 and a mass of 1.9 kg?

What is the purpose of a transformer? Transformers adjust overall circuit resistance. Transformers change the frequency of an oscillating current. Transformers change the voltage in a circuit. Transformers store charge.

Resistors in parallel together contain less resistance than resistors in series together. Create an analogy to explain this phenomena and post it here.

Unlike the idealized voltmeter, a real voltmeter has a resistance that is not infinitely large. part a a voltmeter with resistance rv is connected across the terminals of a battery of emf e and internal resistance r.

The acceleration of an object is the slope of its velocity-time graph. True False

When a cannon fires a cannonball, the cannon will recoil backward because the?

True or False: As we learn more about organisms how we classify them can continue to change. O True O False