# Search results

1. ### An incline problem

I think the acceleration would be -g*cos(35), from that use constant acceleration equations to solve the problem.
2. ### Average Speed?

This problem in general is very dumb because it implies an instantaneous change in speed from 55km/h to 90km/h.
3. ### Average Speed?

The solution offered in the very biginning, \overline {v} = {v_0 + v_f \over 2} only works if assuming constant acceleration.
4. ### Electric fields and electrostatic forces

Electric field, E = \frac{kq}{r^2} Since you have two particles with charges, lets call the unknown charge q1, and the known charge q2, where Since E = 0, \frac{kq_1}{r^2} + \frac{kq_2}{r^2} = 0, where r is the distance from the charge to the point of zero electric field. Therefore... For...
5. ### Help would be realy good now.

Be more specific, what do you mean by cartesian co-ordinates? Explain the situation clearly, and exactly what your assignment is, its hard to help when only a couple of questions are known from an entire assignment. Is this the situation that the two questions apply to?
6. ### Experiment on pendulums

Im sure someone else can do a better job, but i'll try to answer some of your questions. First of all, if i remember correctly, one period of a pendulum is the time it takes for a complete swing to happen (by complete swing, i mean the weight swings from one side to the other, and back). The...
7. ### Force, work, and energy problems

Well, i dont know, as long as i got the answer right
8. ### Force, work, and energy problems

First list out what u know, it always helps me when I do. m=2kg d=1.2m W=3J V_0=1m/s Now figure out how fast the cart accelerates F=ma, W=Fd=mad 3J=(2kg)(a)(1.2m) a=1.25m/s^2 Now use a constant acceleration equation to find the speed at the end. V^2 = V_0^2 + 2ad V^2 = (1m/s)^2...