Physics Final Questions & Answers

Physics Final Questions & Answers A ball of mass "m" and momentum "p" has kinetic energy equal to which of the following: 1/2 (p²/m) , p²/m , 2 (p²/m) , 1/2 (m/p²) , 2 (m/p²) - CORRECT ANSWER- 1/2 (p²/m) -1/2mv² and 1/2pv and 1/2p²/m A person throws a marble straight up into the air, releasing it a short height above the ground and catching it at that same height. If air resistance is negligible, which of the following graphs of position y versus time t is correct for the motion of the marble as it goes up and then comes down? Up then down (straight) Upside down parabola Pointed curve Weird thing Reflection of weird thing - CORRECT ANSWER- Upside down parabola A planet of mass m orbits a start of mass M, where m<M. The orbit is circular, its radius is r, and its period is T. True statements? The orbital speed equals (2(pi)r)/T The gravitation force equals GMm/r² If the orbital radius r were greater, T ...would also be greater. - CORRECT ANSWER- Orbital speed is d/t d = circumfrence = 2(pi)r GMm/r² is the formula