Thanks for visiting guys.. I really need help… i’m having some issues solving the following problems… can someone help me out? I’d like to find out the following…

Can someone describe to me a situation in which a force is applied but no work is done?

(Something i’ve always wondered).. how is work and energy related?

In which on the following is work being done?
A)A person shovels snow off a sidewalk.
B)A worker lifts bricks, one at a time, from the ground to the back of a truck.
C)A roofer’s assistant carries a bundle of shingles across a construction site.

EEEEP!… find the force a person exerts in pulling a wagon 20 m if 1,500 J of work is done.

A car’s engine produces 100kW of power. How much work does the engine do in 5 s? I don’t really understand.

A color TV uses 120 W of power. How much energy does the TV use in 1 hour?

-Thanks In Advance!

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I have purchased a new home and have been forced to move from my condo because something is wrong with the way it is managed. . This is why. I had one pc. of slate in my sidewalk next to the driveway that needed to be raised, they put a whole new sidewalt in 10 feet by 5 feet..Why??? I had to call the Board of Health because my backyard was mud. Now they want me to pay $3100 for 7 new skylights because they are putting a new roof on and to maintain the integrity of the new roof because they cannot find the flashing needed for our skylights, they want me to pay $3100 for new skylights. On Friday they want to pull our shingles off and put tarp on our roof over the weekend and also told us to remove valuables because the roofer is not responsible. I never thought they could come up with anything worse than the sidewalk but they did. I even think they will be using my own skylights with a sticker on them. I swear something is up with our president & the Mgm. person. Please help

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I’M HAVING A HARD TIME WITH THE FOLLOWING!! PLEASE HELP!

Can someone explain how the scientific defenition of work is different from the everyday meaning?

Can someone give me an example of a situation in which a force is applied but no work is done?

Which of the following situations is work being done?
A)A person shovels snow off a sidewalk.
B)A worker lifits bricks, one at a time, from the ground to the back of a truck.
C)A roofer’s assistant carries a bundle of shingles across a construction site.

Can someone describe to me the circumstances for which the output work would equal the input work in a machine?

How does lubricating a machine effect the output force exerted by the machine?

I’m having a hard time calculating the mechanical advantage of a hammer if the input force is 125 N and the output force is 2,000 N.

-THANKS IN ADVANCE!!!!

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