Recent content by bosox3790

[b]1. A +6.2 µC charge is placed at the origin and a -3.9 µC charge is placed at x = 25 cm. At what coordinates can a third charge be placed so that it experiences no net force? [b]2. F=kq_1q_2/r^2 [b]3. I got 3.48 as the velocity between the first to charges. Now I am stuck.

A wheel 60.0 cm in diameter accelerates uniformly from 245 rpm to 395 rpm in 7.5 s. How far will a point on the edge of the wheel have traveled in this time? I keep getting 125.66, I don't really understand what forumal to use.

I tried that and it doesn't work.

Some electric-power companies use water to store energy. Water is pumped by reversible turbine pumps from a low to a high reservoir. To store the energy produced in 1.0 hour by a 115 MW (115 106 W) electric-power plant, how many cubic meters of water will have to be pumped from the lower to the...

I cannot get these two questions at all. Can someone teach me how to do these? A spring with k = 47 N/m hangs vertically next to a ruler. The end of the spring is next to the 15 cm mark on the ruler. If a 2.7 kg mass is now attached to the end of the spring, where will the end of the spring...

how would you do part be on this question?

I used 0+mg(0.15m + change in y)=0+ .5k(change in y)^2

I got 141 cm but that's not correct. I can't figure out the correct answer.

A spring with k = 47 N/m hangs vertically next to a ruler. The end of the spring is next to the 15 cm mark on the ruler. If a 2.7 kg mass is now attached to the end of the spring, where will the end of the spring line up with the ruler marks? I got the answer to be 141 cm because I thought...

I tried to use the formula but I can't get the right answer.

Do I need to know Work in this case?

What is the minimum work needed to push a 1025 kg car 200 m up along a 17.5° incline? (a) Ignore friction. I got 604117.9512J (b) Assume the effective coefficient of friction retarding the car is 0.40? how do I get this one?

Please can someone explain to me how to get the answer to this problem: A sled is initially given a shove up a frictionless 27.0° incline. It reaches a maximum vertical height 1.20 m higher than where it started. What was its initial speed? Thank you.