How do things rust? Is this chemical or mechanical weathering?

Which units can be used to measure length or distance? Check all that apply. gram meter kilometer liter inch Kilometer

Does the sun always shine directly overhead at the equator at noon

A charge of 9 pC is uniformly distributed throughout the volumebetween concentric spherical surfaces having radii of 1.6 cmand 3.6 cm. Let: ke = 8.98755*109 N·m2/C2. What is themagnitude of the electric field 2.

A high-jump athlete leaves the ground, lifting his center of mass 1.8 m and crossing the bar with a horizontal velocity of 1.4 m/s. At what minimum speed must she leave the ground to accomplish this?

The driver of a train moving at 23m/s applies the breaks when it pases an amber signal. The next signal is 1km down the track and the train reaches it 76s later. The acceleration is - 0.26s^2. Find its speed at the next signal.

If you do 1000j of work on a system and remove 500j of heat from it, what is the change in its internal energy

Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 4.5 m long, its mass is 0.42 kg, and the force exerted on it by the children is 71 N.

An object will only change its motion if a force is directly applied to it. is this a true statement?

Janice has just measured the density of an object. Which value is possible? (Density: D = )

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy