5. An engineer wants to design an improved elevator for a building. The original design used a motor that could lift 1000 kg through a distance of 20 meters in 30 seconds. The engineer wants a motor that can lift 800 kg through a distance of 30 meters in 20 seconds. Compared to the old motor, the new motor Explain your answer. (A) Should exert a force of the same magnitude, but must provide larger power Should exert a force of a larger magnitude, output (B) and must provide a larger power output (C) Can exert a force of a smaller magnitude, and can provide a smaller power output (D) Can exert a force of a smaller magnitude, but must provide the same power output (E) Can exert a force of a smaller magnitude, but must provide a larger power output.

5. An engineer wants to design an improved elevator for a building. The original design used a motor that could lift 1000 kg through a distance of 20 meters in 30 seconds. The engineer wants a motor that can lift 800 kg through a distance of 30 meters in 20 seconds. Compared to the old motor, the new motor Explain your answer. (A) Should exert a force of the same magnitude, but must provide larger power Should exert a force of a larger magnitude, output (B) and must provide a larger power output (C) Can exert a force of a smaller magnitude, and can provide a smaller power output (D) Can exert a force of a smaller magnitude, but must provide the same power output (E) Can exert a force of a smaller magnitude, but must provide a larger power output.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter5: Newton's Laws Of Motion

Section: Chapter Questions

Problem 48PQ: To get in shape, you head to the local gym to exercise by lifting weights. Using a lat machine (Fig....

See similar textbooks

Similar questions

A skier starts at rest at the top of a large hemispherical hill (Fig. P7.63). Neglecting friction, show that the skier will leave the hill and become airborne at a distance h = R/3 below the top of the hill. Hint: At this point, the normal force goes to zero. Figure P7.63
If you lower the window on a car while moving, an empty plastic bag can sometimes fly out the window. Why does this happen?
If you hold a horizontal metal bar several centimeters above the ground and move it through grass, each leaf of grass bends out of the way. If you increase the speed of the bar, each leaf of grass will bend more quickly. How then does a rotary power lawn mower manage to cut grass? How can it exert enough force on a leaf of grass to shear it off?
Show that the acceleration of any object down an incline where friction behaves simply (that is, where fk=kN ) is a=g(sinkcos). Note that the acceleration is independent of mass and reduces to the expression found in the previous problem when friction becomes negligibly small (k=0).
Suppose you use an ideal pulley of the type shown in Figure 5.18(c) to support a car engine of mass 115 kg. (a) What would the tension in the rope be?N(b) What force must the ceiling supply, assuming you pull straight up on the rope? The pulley system's mass is 6.00 kg.N (upward)
28. How much power is developed by an airplane that cruises at 450 m/s when the thrust of its engine is 2.35 x 106 N? Group of answer choices No answer 1.06 x108 W 2.36 x109 W 1.06 x109 W 2.36 x108 W
A 4.12 N ball needs to be accelerating in the vertical direction at 20 m/s2 to reach its target height. How much force must be exerted in the vertical direction to accomplish this?
Suppose you use an ideal pulley of the type shown in Figure 5.18(c) to support a car engine of mass 130 kg. What would the tension in the rope be? NWhat force must the ceiling supply, assuming you pull straight up on the rope? The pulley system's mass is 5.00 kg. N (upward)
Suppose you use an ideal pulley of the type shown in Figure 5.18(c) to support a car engine of mass 105 kg. (a) What would the tension in the rope be? N(b) What force must the ceiling supply, assuming you pull straight up on the rope? The pulley system's mass is 6.50 kg. N (upward)
1. A child pushes a table of mass 40 kg with a force of 200 N, the table is on a rough flat floor with a friction coefficient of 0.4. What is the acceleration generated.
An elevator accelerates upward at 6.6 m/s ^ 2 A passenger with amass of 64 kg stands on the scale inside. What weight the scale shows? Use 9.8 m/s ^ 2 for g
8. A car with mass 1300 kg was travelling at 10 m/s when the driver stepped on the brakes. The car was put to a complete stop at exactly 6 seconds. Find the average breaking force. *Use g=9.8 a. 4, 8 14 N b. -2, 167 N c. 5, 387 N d. 3, 721 N e. 1, 548 N 11. A man is standing on a 23 degrees ramp. If the mass of the man is 53 kg, calculate the normal force provided by the ramp to the man. *Use g=9.8 a. 478 N b. 341 N c. 203 N d. 436 N e. 556 N