A father pushes his child in a cart. The cart starts to move. Scientists can use many physical quantities to describe what is happening.

The car is placed on a ramp, which is 20 meters high. The mass of the car and the child is 100kg.

Calculate the potential energy the car will have before it is let go and the velocity the car will travel at down the ramp assuming no frictional forces.

Acceleration due to gravity (g) = 10 m/s2

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?