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anonymous
 4 years ago
PHYSICS QUESTION.
helpppp with this last problem.
anonymous
 4 years ago
PHYSICS QUESTION. helpppp with this last problem.

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0An object's mass is 50 KG. 1 what is its potential energy relative to the ground if its height is 20 meters above the earth? 2 What is its potential energy relative to the ground if the objet is raised from 20m to 100 m? 3 what is the gain in potential energy? 4 What is the gain in total mechanical energy ? (assuming the object at rest at both 20 and 100 m)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.05 What is the amount of work applied to the object to raise it from 20m to 100m? 6 what is the amount of force applied to raise it? 7 what is the weight of the object? 8  why is the weight equal the force acting on the object lift it? 9  what is the power of the machine used to do lifting if the process took 5s to complete?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0What is the equation for potential energy?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Correct. So what is the potential energy when y = 20?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0So 1 = 9800 J and 2 = 39200J but with 3 i subract 39200  9800?

JamesJ
 4 years ago
Best ResponseYou've already chosen the best response.0@nikkysterr: don't forget eashmore some medals for his help!

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0whooo ! alright but it confuses me when it comes to "object at rest"

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0For #4, total mechanical energy is the sum of potential and kinetic energies. If an object is at rest, what is it's kinetic energy?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Correct. So what is the total mechanical energy?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Mechanical Energy is zero.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I'm having some internet trouble. Forgive me if my responses are delayed.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0no problem i appreciate your help.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0physics isnt my strongest subject.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Nope. Mechanical Energy (ME) is defined as such\[ME = KE + PE\]If KE is zero, we still need to account for PE.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0so mechanical energy isnt zero?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Nope. It is equal to potential energy in this case.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Oh so the mechanical energy would be the Potential Energy?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0for the amount of work how do i find the force?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i know i have the distance 80 [10020]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0but i need the force. to get the work.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Nope. To find the work, we can use the workenergy theorem which is defined as\[W = \Delta ME = \Delta KE + \Delta PE = \Delta PE\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0We will find the force from this value of work, using the definition of work you are thinking of. You're on the right track.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0the work force is equal to the PE.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Work is equal to the same answer we got for number 3.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0because i was thinking w = f times d. and force = mass times acceleration i

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Now, from this value\[W = F \cdot y\]We can find the force from this expression, using the value from work obtained in number 5.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0so it would be 9800J = f * 80?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yes. I must leave now. I'll leave you with an outline of what to do: I must leave. I'll outline the solution to the remainder of the questions: 5. The amount of work comes from the definition of work I gave you earlier. \[W = \Delta U = \Delta KE + \Delta PE = \Delta PE\] 6. Comes from the other definition of work. \[W = F \cdot y\]We know the work from part 5, and the distance we move in y (100  20). We can solve for y. 7. Weight is equal to (mass)x(gravity) 8. Because we are not accelerating the object upwards in a true sense, we are just opposing gravity to lift the object. 9. \[P = {W \over t}\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0thank you so much for your help ! i appreciate it !
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