The depth of the Hoover dam is 220m. What is the water pressure at the base of the dam?

Why is there a leap year day every four years? A. to compensate for the 1/2 day that the earth revolves around the sun each year B. To compensate for the 1/4 day that the earth revolves around the sun every year. C. because Galileo said so

A light-year is a unit of a. time. c. mass. b. distance. d. density.

Is it possible for a system to have negative potential energy? a) No, because this would have no physical meaning. b) Yes, as long as the kinetic energy is positive. c) Yes, since the choice of the zero of potential energy is arbitrary.

If a box has a mass of 300 kg, what is its weight on Earth?

Which statement is true about planets with longer orbits in the solar system? A. They have longer periods of revolution. B. They are smaller in size. C. They have less distance to travel for one revolution. D. They have longer seasons

Which device would a sleep researcher use to monitor a sleeping person's brain waves?

An experiment is performed to obtain the value of a physical property. If the true (i. e., correct) value of the property is 50 and the measured (i. e., experimental) value is 32, the percent error of the experimental result is:

White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot.

What two factors determine how fast weathering occurs

A sound that's produced by a single wave at a constant frequency and with no overtones is called