A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.2 s later. If the speed of sound is 340 m/s, how high is the cliff?

Which radioactive isotope would take the least amount of time to become stable? rubidium-91 iodine-131 cesium-135 uranium-238

When you sit still in a chair with your feet on the ground and your back pressing against the back of the chair, are the forces acting on you balanced? Explain.

How does charging by conduction compare with charging by induction? A. A charged object is needed in conduction but not in induction. B. Two neutral objects are needed in conduction but not in induction. C.

a large cargo trucks needs to cross a bridge the truck is 30m long, and 3.2 wide, the cargo exerts a force of 54,000 N the bridge can withstand 450 PA of pressure. is it safe for the truck to cross the bridge?

1. The sun and other stars produce visible light by a. fluorescence. b. luminescence. c. incandescence. d. electroluminescence.

Suppose 3 neutrons are released by an atom of U-235 in the first stage of a fission chain reaction. Each of these neutrons has enough energy to cause another fission reaction in another nucleus of U-235, releasing more neutrons.

What is empirical evidence and what's is it not

What is orbital radii?

Which statement about our solar system is false? a. The Kuniper Belt is between Uranus and Neptune. b. The Sun is the only star in our solar system. c. Our solar system is made up of the Sun and other objects that orbit the Sun. d.

We can model a small merry-go-round as a uniform circular disk with mass 88 kg and diameter 1.8 m. How many 22 kg children need to ride the merry-go-round, standing right at the outer edge, to double the moment of inertia of the system?