How much work is done. Physics problem

In summary, the formula for calculating work is Work = Force x Distance. The SI unit for work is Joules (J), and work is directly related to energy. Work can also be negative if the force applied is in the opposite direction of the object's displacement. Power, on the other hand, measures the rate at which work is done.
  • #1
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#9

Homework Statement



1. A +38 uC charge is place @ 41cm from an identical +38uC. If assuming the potential identity is 0. what's the potential midway btw the 2 charges?
2. How much work is done to move a 0.40 uC charge from a point midway between the charge to a point 10 cm closer to either of the charges?

Homework Equations



V= m/q ?
F= Ke qq/r

The Attempt at a Solution


Not sure where to start but...
8.99e-19(38e-6)(q3)/(.041m-x )^2
8.99e-19(38e-6)(q3)/(x )^2
 
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  • #2


Simply calculate the ΔV because that times q is your work.
 
  • #3


so i used V= Ke q/r?
 

1. How do you calculate work in a physics problem?

The formula for calculating work is: Work = Force x Distance. This means that you multiply the amount of force applied to an object by the distance that the object moves in the direction of the force.

2. What units are used to measure work?

The SI unit for work is Joules (J). Other common units used to measure work include Newton-meters (N*m) and foot-pounds (ft*lbs).

3. How does work relate to energy?

Work is directly related to energy. In fact, work is defined as the transfer of energy. When work is done on an object, energy is transferred to that object. And when work is done by an object, energy is transferred away from that object.

4. Can work be negative?

Yes, work can be negative. This happens when the force applied to an object is in the opposite direction of the object's displacement. In this case, the work done on the object is considered negative because energy is being taken away from the object.

5. What is the difference between work and power?

Work and power are related, but they are not the same thing. Work is the amount of energy transferred to or from an object. Power, on the other hand, is the rate at which work is done. In other words, power measures how quickly work is being done.

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