A space probe traveling from Earth to Mars is shown at the halfway point between the two (not to scale).
Two students are discussing their answer to the previous question.
Student 1: Since the space probe is exactly halfway between Earth and Mars, the strength of the gravitational forces would be the same since the distances are the same.
Student 2: You’re right that the distances are the same, but you’re forgetting about mass. The combined mass of the space probe and Earth is much bigger than the combined mass of the space probe and Mars. So, since the distances are the same, the strength of the gravitational force on the space probe by Earth has to be bigger than the strength of the gravitational force on the space probe by Mars.
Do you agree or disagree with either or bother of the students? Explain your reasoning.

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

What is the single most important equation in all of physics?