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need help with number 20

need help with number 20

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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I need help with number 20

 

19. Determine the power developed by a man weighing 6.0 × 10² newtons who climbs a rope at a constant speed of 2.0 meters per second. 20. Student A lifts a 40.-newton box from the floor to a height of 0.30 meter in 2.0 seconds. Student B lifts a 30.-newton box from the floor to a height of 0.40 meter in 4.0 seconds. Compared to student A, student B does (1) less work but develops more power (2) more work but develops less power (3) the same work but develops less power (4) the same work but develops more power 21. A 5.0 × 10²-newton girl develops 250 watts of power as she runs up two flights of stairs to a landing a total of 5.0 meters vertically above her starting point. Calculate the time required for the girl to run up the stairs. 22. A motor having a maximum power rating of 8.1 x 10 watts is used to operate an elevator with a weight of 1.8 x 104 newtons. What is the maximum weight this motor can lift at an average speed of 3.0 meters per second? (1) 6.0 x 10²³ N (3) 2.4 × 10 N (2) 1.8 x 104 N (4) 2.7 x 10* N 38°F N ch 9:
Transcribed Image Text:19. Determine the power developed by a man weighing 6.0 × 10² newtons who climbs a rope at a constant speed of 2.0 meters per second. 20. Student A lifts a 40.-newton box from the floor to a height of 0.30 meter in 2.0 seconds. Student B lifts a 30.-newton box from the floor to a height of 0.40 meter in 4.0 seconds. Compared to student A, student B does (1) less work but develops more power (2) more work but develops less power (3) the same work but develops less power (4) the same work but develops more power 21. A 5.0 × 10²-newton girl develops 250 watts of power as she runs up two flights of stairs to a landing a total of 5.0 meters vertically above her starting point. Calculate the time required for the girl to run up the stairs. 22. A motor having a maximum power rating of 8.1 x 10 watts is used to operate an elevator with a weight of 1.8 x 104 newtons. What is the maximum weight this motor can lift at an average speed of 3.0 meters per second? (1) 6.0 x 10²³ N (3) 2.4 × 10 N (2) 1.8 x 104 N (4) 2.7 x 10* N 38°F N ch 9:
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