Acar moving with a velocity of 20 meters/second has 1.8 × 105 joules of kinetic energy. what is the mass of the car? a.) 4.6 × 102 kilograms b.) 9.0 × 102 kilograms c.) 1.0 × 103 kilograms d.) 1.2 × 103 kilograms

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.