An empty hollow metal sphere has a potential of + 130 V with respect to ground (defined to be at V = 0) and has a charge of 1.8 10-9 C. Find the electric potential at the center of the sphere.

A water line with an internal radius of 5.29 x 10-3 m is connected to a shower head that has 15 holes. The speed of the water in the line is 0.651 m/s.

The best evidence of Earths rotation is provided by

Why does light refract when entering a different medium of propagation?

A string is stretched by two equal and opposite forces F newton each then the tension in sting is?

The Tacoma Narrows Bridge collapsed due to A. beats. B. frequency modulation. C. destructive interference. D. resonance.

8. A force of 80 pounds on a rope is used to pull a box up a ramp inclined at 100 from the horizontal. The rope forms an angle of 330 with the horizontal. How much work is done pulling the box 25 feet along the ramp?

A raindrop has a mass of 5.4 * 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted (a) on the raindrop by the earth and (b) on the earth by the raindrop.

As an astronaut travels towards Earth, her weight A. decreases because gravity decreases. B. decreases because her mass decreases. C. increases because gravity increases. D. remains the same because her mass remains the same.

Lightning often strikes water. a. True b. False

How much work must be done on a 10 kg snowboard to increase its speed from 4 m/s to 6 m/s?