Recent content by hollystella

I see... So then W(total) = (20 N) * (15 m)? Then W(total) would be 300 J. Then I would be able to put that into W(tot) = K2 - K1, find what K1 is and then equate that to (1/2)m*(v1)^2 to find the initial speed. Is that right?

I was thinking there would be a force upwards because it was thrown up into the air. Is there another way I should be looking at this?

This is the problem: You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work-energy theorem to find a) its speed just as it left the ground; b) its maximum height. I drew a...

Thanks so much for your help. This is what I calculated it out to: I found the sum of the forces in the vertical direction: ncos(angle) + (-mg) = 0, so ncos(angle) = mg, and in terms of mg, n = (mg)/(cos[angle]). To find out what that angle was, I used the sum of the forces in the...

The problem was: A curve with a 120-m radius on a level road is banked at the correct angle for a speed of 20 m/s. If an automobile rounds this curve at 30 m/s, what is the minimum coefficient of static friction neeed between tires and road to prevent skidding? I drew a free body diagram...

Hey all, I'm new here and would appreciate some help with this question about banked curves. A curve with a 120-m radius on a level road is banked at the correct angle for a speed of 20 m/s. If an automobile rounds this curve at 30 m/s, what is the minimum coefficient of static friction...