On the way to lower floors, an elevator begins its descent from rest with a constant acceleration, descending the first 5.0 m in 1.85 s. What is the apparent weight of a 75 kg man inside the accelerator during this time interval?
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- 1. A 75.0 kg man stands on a platform scale in an elevator. Starting from rest, the elevatorascends, attaining its maximum speed of 1.20 m/s in 1.00 s. It travels with this constant speed forthe next 10.00 s. The elevator then undergoes a uniform acceleration in the negative y directionfor 1.70 s and comes to rest. What does the scale register: (d) during the time it is slowing down? Take g = 10 ms-2In a classic clip on Americas Funniest Home Videos, a sleeping cat rolls gently off the top of a warm TV set. Ignoring air resistance, calculate the position and velocity of the cat after (a) 0.100 s, (b) 0.200 s, and (c) 0.300 s.A wrench is dropped from the top of a tall tower. It takes 3.07 s to reach the ground. How tall is the tower, in meters? Assume the wrench’s initial velocity is zero, use 9.80 m/s2 as the acceleration due to gravity, and assume air drag does not matter.
- An elevator weighing 5.8 kN in ascending with an acceleration of 3 m/s2. Theoperator is standing on the scale inside the elevator and during the ascesion thescale registers 910N. What is the tension (N) in the supporting cables?A box with mass m sits at the bottom of a long ramp thatis sloped upward at an angle a above the horizontal. You give the boxa quick shove, and after it leaves your hands it is moving up the rampwith an initial speed v0. The box travels a distance d up the ramp andthen slides back down. When it returns to its starting point, the speedof the box is half the speed it started with; it has speed v0 /2. What isthe coefficient of kinetic friction between the box and the ramp? (Youranswer should depend on only a.)Forces During Chin-ups. When you do a chinup, you raise your chin just over a bar (the chinning bar), supporting yourself with only your arms. Typically, the body below the arms is raised by about 30 cm in a time of 1.0 s, starting from rest Assume that the entire body of a 680 N person doing chin-ups is raised by 30 cm, and that half the 1.0 s is spent accelerating upward and the other half accelerating downward, uniformly in both cases. Draw a free-body diagram of the person’s body, and use it to find the force his arms must exert on him during the accelerating part of the chin-up.
- When you do a chinup, you raise your chin just over a bar (the chinning bar), supporting yourself with only your arms. Typically, the body below the arms is raised by about 30 cm in a time of 1.0 s, starting from rest. Assume that the entire body of a 680 N person doing chin-ups is raised by 30 cm, and that half the 1.0 s is spent accelerating upward and the other half accelerating downward, uniformly in both cases. Draw a free-body diagram of the person’s body, and use it to find the force his arms must exert on him during the accelerating part of the chin-up.A 9500-kg test missile blasts off vertically from the ground with a constant upward accelerationof 2.28 m/s^2. When it has reached a height of 550 m, its engines suddenly fail; the only forceacting on it is now gravity. a) What is the maximum height reached? b) How much time will elapse after engine failure before the rocket comes crashing down theground, and how fast will it be moving just before it crashes? c) Sketch a vs t, v vs t, and y vs t graphs of the rocket’s motion from the instant of blast-off tothe instant just before it strikes the ground.You stand on the seat of a chair and then hop off. (a) During the time you are in flight down to the floor, the Earth moves toward you with what acceleration? Model the Earth as a perfectly solid object. (Assume your mass is 66.0 kg.) 1.08*10E-22 Your response is off by a multiple of ten. m/s² Explain your logic. (b) The Earth moves toward you through what distance? (Assume the seat is 46.0 cm high.) 1.56*10E-23
- A fa Vo B C Fig. 523. Problems 1131-1133. 31/ In Fig. 523, bodies A and Care connected by a weightless flexible cord over a smooth surface B (f = 0). The coeffi- cient of friction f = 1/3. If WA = 64.4 lb., We 96.6 lb., and the initial velocity of A is 30 fps toward the left, find the time in seconds for A to travel 10 ft. Ans. 0.39 sec. except that =The fire alarm goes off, and a 97-kg fireman slides 3.0 m down a poleto the ground floor. Suppose the fireman starts from rest, slides withconstant acceleration, and reaches the ground floor in 1.2 s. What wasthe upward force F>exerted by the pole on the fireman?When you do a chin-up, you raise your chin just over a bar (the chinning bar), supporting yourself with only your arms. Typically, the body below the arms is raised by about 30 cm in a time of 1.0 s, starting from rest. Assume that the entire body of a 680-N person doing chin-ups is raised by 30 cm, and that half the 1.0 s is spent accelerating upward and the other half accelerating downward, uniformly in both cases. Draw a free-body diagram of the person’s body, and use it to find the force his arms must exert on him during the accelerating part of the chin-up. Show complete solution.