Thread: Change in Gravitational Potential Energy (Theta Involved)

A 100kg man walks up a steep hill that is inclined at to the horizontal. After walking along this incline, his change in gravitational potential energy will be:

a)
b)
c) Correct Answer
d)

Given


to horizontal

Required


Analysis

I'm not exactly sure how to solve this with the given.
Do I have to use the equation ?

As I can "guess" from your question theta here stands for degree itself

Reason and Explanation to your answer:

Change in gravitational potential energy is = m*g*h

Where h is the distance above the initial line ,in your case its horizontal -
---------------------------------------
Distance of man above horizontal --after he has climbed 1000m along the slope of 30degree inclination = 1000 sin(30)

Put the
value of g and m in the equation

your answer

= 100 * 1000 sin(30) * 9.8 Joule

= 10^5 * (1/2) * 9.8 J

=4.9 * 10^5 J

= 4.9e5 J

Tell me if you still need help