Speed refers to what and is it scalar or vector

What is the density of a rock which has a mass of 35 grams and a volume of 7.0 cubic centimeters?

An electric motor rotating a workshop grinding wheel at a rate of 151 rev/min is switched off. Assume constant angular deceleration of magnitude 2.23 rad/s 2. Through how many revolutions does the wheel turn before it finally comes to rest

Which term describes the forces acting on the car? A. inertial B. buoyant C. balanced D. unbalanced

How many places are there for electrons in the third shell of an atom?

The source of the sun's heat is A. nuclear fission. B. nuclear disintegration. C. nuclear fusion. D. nuclear separation.

If 30 N of force is exerted over an area of 20 m2, how much pressure is being applied? A. 1.5 pascals B. 50 pascalsC. C. 600 pascals

A cannon recoils from launching a cannonball. The speed of recoil is small because the?

Which statement is correct

The toxic effects of water pollution are generally

Thermal energy flows spontaneously from hotter objects to colder ones. a. True b. False