Mars was once similar to Earth in that

A. it had only one moon.

B. liquid water flowed on its surface.

C. it showed evidence of plate tectonics.

D. its atmosphere had a thin layer of carbon dioxide.

Potassium hydroxide and phosphoric acid react to form potassium phosphate and water according to the equation: 3KOH (aq) + H3PO4 (aq) K3PO4 (aq) + 3H2O (l) Determine the starting mass of each reactant if 62.1 g of K3PO4 is produced and 80.

The force on a straight current-carrying wire in a magnetic field is proportional to the current in the wire, the strength of the field, and the of the wire. a) trueb) false

You can represent the direction of force by using?

All forms of energy can do work. True or False

Calculate the hydrostatic difference in blood pressure between the brain and the foot in a person of height 1.93 m. The density of blood is 1.06 * 103 kg/m3.

Assume that a friend hands you a heavy book to hold as he turns the combination lock on his locker. Which of you does more work?

A tube, open at only one end, is cut into two shorter (nonequal) lengths. The piece that is open at both ends has a fundamental frequency of 422 Hz, while the piece open only at one end has a fundamental frequency of 666 Hz.

Table tennis the path of a table-tennis ball after being hit and hitting the surface of the table can be modeled by the function h=-4.9t (t-0.42) where h is the height in meters above the table and t is the time in seconds.

A coat rack weighs 65.0 lbs when it is filled with winter coats and 40.0 lbs when it is empty. The base of the coat rack has an area of 452.4 in2.

An initially stationary object experiences an acceleration of 6 m/s2 for a time of 15 s. How far will it travel during that time?