A student weighing 700 N climbs at constant speed to the top of an 8 m vertical rope in 10 s. The average power expended by the student to overcome gravity is most nearly?

a. 1.1 Wb. 87.5 Wc. 560 Wd. 875 We. 5600 W

Explanation:

A student weighing (W) = 700 N,  

The constant speed to the top of vertical rope (ΔV) = 8 m and

Time (T) = 10 s

To find, the average power expended by the student to overcome gravity (most nearly) = ?

We know that,

Power =

=

=

=

= 70 × 8 W

= 560 W

∴ The average power expended by the student to overcome gravity (most nearly) = 560 W

Thus, the required "option c) 560 W" is correct.

answer: option c.

explanation:

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures