Ok so the question goes like this: The winding cages in mine shafts are used to move workers in and out of the mines. These cages move much faster than any commercial ele- vators. In one South African mine, speeds of up to 65.0 km/h are at- tained. The mine has a depth of 2072 m. Suppose two...
A 2.1x10^3kg car starts from rest at the top of a driveway that is sloped at an angle of 20 degrees with the horizontal. An average friction force of 4.0x10^3N impedes the car's motion so that the car's speed at the bottom of the driveway is 3.8m/s. What is the length of the driveway?
What i...
A wrench slides off a tilted shelf, although if a force of 1.6N is applied opposite the wrench's motion the wrench will slide down the shelf with a constant velocity. If the shelf is 1.2m long, what is the work done by the applied force on the wrench?
This is what I did:
w=(1.6N)(1.2m)= and...
A worker uses a ramp to slide a refrigerator onto the back of the truck. The ramp is 5.0m long, and raises the refrigerator 1.5m above the ground. The amount of work done by the worker is 1800J. What is the magnitude of the force the worker must exert to load the refrigerator?
Ok so the first...