A roller coaster begins at the top of a hill. If it accelerates at the rate of 2 m/s2 and has a mass of 2000 kg, what net force is acting on it? (F=ma)

A. 0.001 N

B. 0.5 N

C. 4000 N

D. 1000 N

A train traveling 80.0 kph is blowing its horn as it approaches a railroad crossing. The horn has a frequency of 300.0 Hz. Assume the speed of sound is 331.5 m/s. What is the observed frequency of the horn? 395 Hz 281 Hz 322 Hz

In any case, resistance of a material is a measure of the quantity of present in the materials.

How is momentum conserved in a Newton's cradle when one steel ball hits the other? 1. Both balls have momentum to start, and they share it after the collision. 2. All the momentum starts in one ball, and after the collision, they share it. 3.

A wire is wrapped multiple times around a galvanized or aluminum nail and then each end of the wire connected to a battery for some period of time. what happens when the nail is then positioned next to a paper clip and why?

A train is accelerating at a rate of 2 m/s. If its initial velocity is 20 m/s, what is its velocity after 30 seconds? Given: Equation: Plug in: Answer:

What causes ice to melt and water to boil

A block of mass 3.5 kg slides down a frictionless inclined plane of length 6.4 m that makes an angle of 30 degrees with the horizontal. if the block is released from rest at the top of the incline, what is its speed at the bottom

What is the wavelength of an earthquake wave if it has a speed of 5 km/s and a frequency of 10 Hz?

The gamma ray released by each decay carries 140kev of energy. find the total energy e released by decays in the 2 hours.

Think of the last five things you read. Now think of a type of reading you havent done recenty have never read. What kind of pattern do you see in your reading? What is your favorite type of reading and your least favorite type of reading?