Mechanical energy is ...

A. Found in machinery only

B. usually measured at the atomic level

C. the sum of the chemical and thermal energy of an object

D. the sum of the kinetic and potential energy of an object

What are three good things plate tectonics provide for humans?

lthough robots have largely taken the place of humans for travel to the moon and beyond, humans will likely return to the moon someday. Where should we land? Calculate how hot it gets when the sun is directly overhead.

Liquid water is heated until it boils and becomes water vapor. Which statement is true about the water?

If two teams playing tug-of-war pull on a rope with equal but opposite forces, what is the net external force on the rope?

Imagine a 10kg block moving with a velocity of 20m/s to the left. Calculate the kinetic energy of this block.

What type of simple machine is a hand drill? A) pulley B) wedge C) ramp D) screw

Calculate the wavelength and frequency of the radiation emitted by the electronic transition from the 10th to the 9th excited state of hydrogen.

An unknown fluid has a specific gravity of 0.750. What is the volume of 22.5 kg of this fluid? A. 10 L B. 20 L C. 30 L D. 40 L

What kind of tide is responsible for extreme tides

What does the speed of sound depend on? A. Medium that the sound travels through B. Acoustics C. Frequency of the sound D. Loudness of the sound