Answer:
e. The impulse exerted by the floor
Explanation:
a. The momentum just before colliding with the floor.
will be identical because they have the same mass and are falling the same distance so will have the same velocity. p = mΔv, v = √(2gh)
b. The amount of time in contact with the floor.
a component of impulse, but not the entire story. Ball B could have a longer contact time, but a smaller average force. p = FΔt
c. The kinetic energy just before colliding with the floor.
will be identical because they have the same mass and are falling the same distance so will have the same velocity. KE = ½mv², v = √(2gh)
d. The average force exerted by the floor
a component of impulse, but not the entire story. ball B could have a larger average force but a shorter period of action. p = FΔt
C.
The kilogram SI unit is based off an original prototype that is kept in France. The prototype itself is based off the mass of water under special conditions for temperature as well as pressure.
Weight = (mass) x (local gravity)
8.2 N = (5 kg) x ( g )
Divide each side
by 5 kg : 8.2 N / 5 kg = g
g = (8.5 kg-m/s²) / (5 kg)
= (8.5 / 5) m/s²
= 1.7 m/s² .
The answer is:
A. Oxygen
Air contains more than one substance, water is chemically made up of oxygen and hydrogen, and sodium chlorine is a mixture of sodium and chlorine.
Hope it helps :)