Calculating Work for Climbing Stairs

  • Thread starter Thread starter jsr219
  • Start date Start date
  • Tags Tags
    Work
AI Thread Summary
A 75-kg person climbing a flight of stairs 10 m high does approximately 7357.5 joules of work, calculated using the formula W = (f)(d), where force is derived from the person's weight. The force is determined by multiplying mass (75 kg) by gravity (9.81 m/s²), resulting in 735.75 N. This force is then multiplied by the distance (10 m) to find the total work done. The correct answer is approximately 7350 J, confirming the calculations are accurate. Understanding that work is the product of force and distance is crucial in these physics problems.
jsr219
Messages
8
Reaction score
0
How much work is done when a 75-kg person climbs a flight of stairs 10 m high at a constant speed

A.) 7.35 * 10^5 j
B.) 750 j
c.) 75 j
D.) 7500 j
E.) 7350 J


W = (f)(d)
f = ma
W= (ma)(d)



Now I'm assuming that the force is parallel to the stairs (distance as the person walks up the stairs)

so I found the force
f = ma
f= (75)(9.81) = 735.75


then I solved for work
W = (f)(d)
W = 735.75(10)
W = 7357.5 j

answer E

I'm new to to work so I just want to clarify if I'm doing the problem right or wrong
If I made any errors please feel free to correct me
We learn by our mistakes after all

Thank You
 
Physics news on Phys.org
Your answer is correct. Work is just force acting over a distance. Here, the force is the weight of the person (force of gravity), and the distance is the height of the steps.
 
Thread 'Struggling to make relation between elastic force and height'
Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Back
Top