As a roller coaster car starts down a slope, it's velocity is 4m/s. But 3 seconds later it's velocity is 22m/s in the same direction. What is its acceleration

The distance between neighboring singly charged sodium and chlorine ions in crystals of table salt (NaCl) is 2.82*10^-10m. What is the attractive electric force between the ions?

A wave is traveling at 241 m/s. It has a wavelength of 30.0 m. What is its frequency? A. 8.03 Hz B. 30.0 Hz C. 271 Hz D. 7,230 Hz

If you push on a heavy box that is at rest, you must exert some force to start its motion. 5. however, once the box is in motion you need a smaller force to maintain that motion. why?

An airplane touches down on the runway with a speed of 70 m/s2. Determine the airplane after each second of its deceleration.

Why do we need to separate out certain things from a mixture

The observation location A is located at m. The conventional current running through the wire is 7.5 amperes. In this exercise you will calculate the magnetic field at the observation location due only to segment 4 of the wire.

The wavelength of a light wave can be used to measure which of the following? A. The direction the wave is traveling B. How many photons the wave contains C. How much energy the wave has D. How high the top of the wave is

Sound 1 has an intensity of 38 W/m2. Sound 2 has an intensity level that is 2.5 dB greater than the intensity level of sound 1. What is the intensity of sound 2?

A cannonball is launched horizontally off a 20 m high castle wall with a speed of 85 m/s. How long will the cannonball be in flight before striking the ground? What is the range of the cannonball?

It is well known that bullets fired at Superman simply bounce off his chest. Suppose that a gangster sprays Superman's chest with bullets of mass m = 1.7 g at a rate of R = 165 bullets/min. The speed of each bullet is v = 380 m/s.