Author Question: In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each ... (Read 472 times)

leilurhhh · **on:** Jul 29, 2018

In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each flight rises 3.1 m. (1 hp = 746 W)

(a) What is her total change in potential energy?
(b) What was the minimum average power (in watts) that she expended during the 22 s?
(c) What horsepower motor would be required to generate the same power?

Question 2

A steel wire, 3.2 m long, has a diameter of 1.2 mm. The wire stretches 1.6 mm when it bears a load. Young's modulus for steel is 2.0 1011 Pa. The mass of the load is closest to

A) 28 kg. B) 24 kg. C) 16 kg. D) 20 kg. E) 12 kg.

nathang24 · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

(a) 6.3 kJ (b) 290 W (c) 0.39 hp

Answer to Question 2

E

leilurhhh · **Reply #2 on:** Jul 29, 2018

Thank you!

nathang24 · **Reply #3 on:** Jul 29, 2018

Always glad to help...

Author Question: In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each ... (Read 472 times)

leilurhhh

In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each ...

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nathang24

In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each ...

leilurhhh

In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each ...

nathang24

In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each ...