Tools used as nut crackers by chimps and birds

Water vapor is less dense than ice because: a. molecules in the gas phase are in constant motion. b. molecules in the gas phase have more potential energy than in solids. c. molecules in the gas phase have more kinetic energy than in solids. d.

Which is a factor that affects size of mineral crystals formed in magma

An engine flywheel initially rotates counterclockwise at 5.85 rotations/s. Then, during 21.3 s, its rotation rate changes to 3.31 rotations/s clockwise.

Where do deep currents flow?

Suppose you work at a bowling alley. After work one day, you decide to line up bowling pins in a triangular pattern with one pin in the first row, two pins in the second, three pins in the third, and so on.

A roller coaster has a mass of 500 kg. It drops from rest at the top of a hill that's 57 m tall. How fast is it going when it reaches the bottom? Acceleration due to gravity is g = 9.8 m/s2.

Two sinusoidal waves are moving through a medium in the positive x-direction, both having amplitudes of 7.00 cm, a wave number of k=3.00m-1, an angular frequency of ω=2.50s-1, and a period of 6.00 s, but one has a phase shift of an angle ϕ=π12rad.

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?