If a ball is thrown straight up into the air with an initial velocity of 70 ft/s, its height in feet after t second is given by y=70t−16t2. Find the average velocity for the time period beginning when t = 2 and lasting:
(i) 0.1 seconds
(ii) 0.01 seconds and
(iii) 0.001 seconds.

This is the substance(s) formed in a chemical reaction.

Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j

Abag of potato chips contains 2.00 l of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0 deg c. what will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00 deg c and atmospheric pressure is 70.0 kpa? assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.