Tony (of mass 45 kg) coasts on his bicycle (of mass 20 kg) at a constant speed of 7 m/s, carrying a 7 kg pack. tony throws his pack forward, in the direction of his motion, at 5 m/s relative to the speed of bicycle just before the throw. what is the initial momentum of the system (tony, the bicycle, and the pack)? answer in units of kg · m/s.

Sarah and michelle work at a tech company that designs exercise apps. sarah tells michelle she has heard that james, their supervisor, interviewed with a competitor and may be leaving the company, which would open up a management position. what kind of power is sarah exerting?

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.