Does lightning come from the ground? I have heard that lightning comes from the ground up. But when it strikes something on land, it's the top of that object that gets destroyed.

In this case, lithium would be classified as a (n) A) atom. B) compound. C) ion. D) molecule.

True or False: Cooler objects always have more thermal energy than warmer objects.

The temperature of a gas is increased by 10degree Celsius. what is the corresponding change on Fahrenheit scale?

You are asked to design a retroreflector using two mirrors that will reflect a laser beam by 180 degrees independent of the incident direction of the beam. What should be the angle between the two mirrors?

A sound wave has a wavelength of 0.0325 m and a frequency of 9380 Hz. What is the speed of the wave? (Unit = m/s)

What causes day and night on earth?

A yo-yo can be thought of as a solid cylinder of mass m and radius r that has a light string wrapped around its circumference (see below). One end of the string is held fixed in space.

Why is time an independent variable and position is a dependent variable in a position versus time graph

A geologist estimates that a large boulder weighs 7840 N. What should he estimate the mass of this boulder to be? A. 650 kg B. 740 kg C. 780 kg D. 800 kg

Two objects have the same momentum. Do the velocities of these objects necessarily have (a) the same directions and (b) the same magnitudes? Give your reasoning in each case.