HELP ME PLEASEE ...An object makes 45 revolutions in 10 seconds. What is the frequency of its motion?

The pressure increases by 1.0 x 104 n/m^2 for every meter of depth beneath the surface of the ocean. at what depth does the volume of a pyrex (bulk modulus 2.6 x 1010n/m^2) glass cube, 9.8 x 10^−2m on an edge at the ocean's surface, decrease by 7.5 x 10−10m^3? explain the formula beyond this point: p=1.0x10^4, b=2.6x10^10, l=9.8x10^−2, delta v=7.5x10^−10. at some point l needs to be cubed. why p is divided by delta v?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?