4. If a book falls off the kitchen counter and hits the floor 0.51 seconds later, how tall is the counter and how fast would the book be traveling when it
hits the floor? Assume the book fell at a rate of 9.8 m/s2 (acceleration due
to gravity).

At what point the certain object feels zero garvitational force between earth and the moon. take the required information from the book.required: distance away from earth or moon

J. j. thomson’s experiment disproved the theory that an atom

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm