Is it true that once rock forms it never changes

Dallas says that any change in velocity is directly proportional tothe time interval over which the change took place. Dana says thatis true only when the acceleration is constant. Which one, ifeither, is correct? a.

What is the shape of popcorn

A railroad diesel engine weighs four times as much as a freight car. The diesel engine coasts at 4.8 km/h into a freight car that is initially at rest.

Sewage at a certain pumping station is raised vertically by 5.49 m at the rate of 1 890 000 liters each day. The sewage, of density 1 050 kg/m3, enters and leaves the pump at atmospheric pressure and through pipes of equal diameter.

You slide across a wooden floor in your socks. There is a normal force of 800 N acting on you, and the coefficient of kinetic friction is 0.44. What is the force of friction acting on you as you slide?

The puzzle box is traditionally associated with the work of

A 0.95-kg sample of water at 11°C is in a calorimeter. You drop a piece of steel with a mass of 0.39 kg at 212°C into it.

Let the magnitudes of two displacement vectors be 4 m and 8 m, respectively. If the two vectors are added, the magnitude of the resultant vector. A. is exactly equal to 4 m. B. is exactly equal to 12 m. C. is greater than 12 m. D.

justin pushes basket of toys with 50N of force for 3 meters in 100 seconds. how much work did he do on the basket

In general, what can be said about metals.