A column of water exerts a pressure of 100. Pa and a force of 2.40 N. What is the cross-sectional area of a the column?

A frictional force is the force exerted by a surface as an object moves across it; therefore, it is considered a contact force. true or false

Explain the difference between constructive and destructive interference.

Convection is a mode of heat transfer for which types of objects? A. solids and liquids B. gases and solids C. gases only D. liquids and gases E. liquids only.

The blade of a lawn mower is rotating at an angular speed of 128 rad/s. The tangential speed of the outer edge of the blade is 32 m/s. What is the radius of the blade?

A car traveling along a road begins accelerating with a constant acceleration of 1.5 m/s2 in the direction of motion. after traveling 392 m at this acceleration, its speed is 35 m/s. determine the speed of the car when it began accelerating.

A wave with a frequency of 30 Hz has a wavelength of 40.5 m. How fast is the wave traveling?

A soccer ball is sitting in the middle of a soccer field during a game. When the referee blows his whistle, one of the players runs toward the ball and kicks it as hard as he can.

A body with v=20m/s changes its speed to 28m/s in 2sec. its acceleration will be

Charge: A piece of plastic has a net charge of + 2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 * 10-19 C)

How much heat is needed to raise the temperature of 6g of water by 18oC?