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    An incline problem

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

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

    The solution offered in the very biginning, \overline {v} = {v_0 + v_f \over 2} only works if assuming constant acceleration.
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    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...
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    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?
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    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...
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    Force, work, and energy problems

    Well, i dont know, as long as i got the answer right
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    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...