The movement of the tectonic plates is caused by A) convection currents in Earth's mantle. B) the gravity of the iron-nickel core. Eliminate C) the rotation of the Earth. D) the Moho discontinuity.

What is the region around a magnet where the magnetic force is exerted? A. magnetic poles B. tesla C. charge field D. magnetic field

A kg mass is connected to a nail on a frictionless table by a massless string m long. there is no appreciable friction between the nail and the string.

5) A girl with 40kg mass is riding an 8 kg bicycle. At the top of the hill her speed is 6.0 m/s, and her speed triples at the bottom of the hill. The hill is 15.0 m high. What is the work done by the non conservative forces?

When does radioactive decay occur? A. when an atom gains electrons B. when neutrons accumulate in the nucleus C. when an atom loses electrons D. when the nucleus decays

An object that has negative acceleration is definitely doing what? speeding up maintaining a constant speed slowing down (incorrect) accelerating in a direction that is opposite to a stated positive direction.

Which of the following water samples would be considered acidic

A linearly-polarized electromagnetic (EM) wave has an electric field with amplitude 1000 V/m. You hold a a linear polarizer in front of it and rotate the polarizer so that all of the EM wave is blocked. You then rotate the polarizer 30 degree.

Let y'=4 x. find all values of r such that y = rx^{2} satisfies the differential equation. if there is more than one correct answer, enter your answers as a comma separated list.

What are the starting materials for nuclear fission

Why is it possible to throw a 0.145 kg baseball much further than a 7 kg bowling ball?