20. Student A lifts a 40.-newton box from the flöor 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
20. Student A lifts a 40.-newton box from the flöor 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
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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please help with questions 20,21, and 22
Transcribed Image Text: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 x 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 × 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 10 N
(2) 1.8 x 10 N
(3) 2.4 x 104 N
(4) 2.7 × 10ª N
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