...ton cartne inclinedt of work18. What is the average power developed bya motor as it lifts a 400.-kilogram mass ata constant speed through a vertical distanceof 10.0 meters in 8.0 seconds?(1) 320 W(2) 500 W(3) 4,900 W(4) 32,000 W19. Determine the power developed by a manweighing 6.0 x 102 newtons who climbs a ropeat a constant speed of 2.0 meters per second.20. Student A lifts a 40.-newton box from the floorto a height of 0.30 meter in 2.0 seconds. StudentB lifts a 30.-newton box from the floor to aheight of 0.40 meter in 4.0 seconds. Comparedto 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 powerverticallyne inclinede would be(4) 9.8 Jeight to a heightcrane does work21. A 5.0 x 102-newton girl develops 250 watts ofpower as she runs up two flights of stairs to alanding a total of 5.0 meters vertically above herstarting point. Calculate the time required forthe girl to run up the stairs.x 103 WX 104 Wt of work that a0. seconds?5.0 x 103 J5.0 × 104 J22. A motor having a maximum power rating of8.1 X 104 watts is used to operate an elevatorwith a weight of 1.8 × 104 newtons. What isthe maximum weight this motor can lift at anaverage speed of 3.0 meters per second?(1) 6.0 × 103N(2) 1.8 × 104 NA watts exerts3 newtons onerage speed(3) 2.4 × 104N(4) 2.7 × 104N23. A girl weighing 500. newtons takes 50.0 secondsto climb a flight of stairs 18 meterr himt10x 103newton

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18. What is the average power developed by a motor as it lifts a 400.-kilogram mass at a constant speed through a vertical distance

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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Concept explainers

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

Question

...
ton cart
ne inclined
t of work
18. What is the average power developed by
a motor as it lifts a 400.-kilogram mass at
a constant speed through a vertical distance
of 10.0 meters in 8.0 seconds?
(1) 320 W
(2) 500 W
(3) 4,900 W
(4) 32,000 W
19. Determine the power developed by a man
weighing 6.0 x 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
vertically
ne inclined
e would be
(4) 9.8 J
eight to a height
crane does work
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.
x 103 W
X 104 W
t of work that a
0. seconds?
5.0 x 103 J
5.0 × 104 J
22. A motor having a maximum power rating of
8.1 X 104 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 × 103N
(2) 1.8 × 104 N
A watts exerts
3 newtons on
erage speed
(3) 2.4 × 104N
(4) 2.7 × 104N
23. A girl weighing 500. newtons takes 50.0 seconds
to climb a flight of stairs 18 meterr himt
10x 103newton

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