On earth, you can throw a ball straight up until it reaches a height of 18 meters. If you threw the same ball with the same initial velocity on another planet, it would only reach a height of h meters, which is equal to the day of the month in which you were born, divided by 2. For example, if my birthday is February 19th, my ball would reach a height of 9.5 meters on the second planet. What is the acceleration due to gravity on the second planet?

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

Acar travels 40m in 8 seconds find the car speed