When you drop a rock from a cliff, which of the following happens?

Only the rock falls to the Earth

Only the Earth falls up to meet the rock

The rock and the Earth fall towards each other

None of the above

What is the frequency of an electromagnetic wave that has a wavelength of 4,000m?

When the frequency of an electromagnetic wave increases, its energy a. stays the same. b. increases. c. decreases?

What's the difference between solids and liquids?

The diagram shows that currently about 100 gigatons/year of carbon are moved from the atmosphere to vegetation on land. Which process could decrease this number? ncdc. noaa. gov. A. reducing the amount of urban area in the world. B.

Suppose you put in 100 j of work on a lever and get out 93 j of work. what is the efficiency of the lever and how much of the work input is lost as heat in joules?

50g of ice at 0°C is mixed with 50g of water at 80°C, what will be the final temperature of a mixture in degrees C?

If the Density of an object is 5.2 g/cm3, and its volume is 3.7 cm3, what is its mass

The direction of the magnetic field is determined by which of the following? A. energy of the current B. magnetic domain C. magnetic force D. direction of the current

A ship is traveling at 154 m/s and accelerates at a rate of 1.80 m/s^2 for 1 minute. What will its speed be after that minute? Calculate the answer in both meters per second and kilometers per hour.

Gerry is looking at salt under a powerful microscope and notice a crystalline structure. what can be known about the salt sample that Gerry is looking at