A train moves south with a speed of 20m/s. A man on the train walks south with a speed of 0.2m/s relative to the train. how long does it take the man to move 8 m relative to the train. A. 15s
B. 32s
C.40s
D. 0.41s

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

Which notation is used to represent an alpha particle? a. b. c. d.

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?