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  1. S

    Help w/Current Through Batteries

    Thanks, that actually helped alot! And I looked over your method again, and it does make more sense.
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    Help w/Current Through Batteries

    Okay, so, defining the current to be traveling in a clockwise direction: LEFT LOOP: E1-i1R1-(i2)R2-E2-i1ri=0 RIGHT LOOP: -E3-i3R1+E2-(i2)R2-i3R1=0 I feel like a third variable is necessary. Because the R1's on either side aren't equal. THere is one current going through the left...
  3. S

    Help w/Current Through Batteries

    Wouldn't you have three unknowns? The current through R2, the current through R1 in the left loop, and the current through R1 in the right loop? That's what's been confusing me.
  4. S

    Help w/Current Through Batteries

    In the figure below, the resistances are R1 = 1.1 , R2 = 1.5 , and the ideal batteries have emfs 1 = 2.0 V, and 2 = 3 = 5.5 V. http://www.webassign.net/hrw/hrw7_27-40.gif I feel like I've tried everything to solve this problem; I just don't get it!
  5. S

    Linear Momentum of A System of Particles

    Well, it's in increments of 0.5, so I just assumed the momentum axis went from 0-2.
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    Linear Momentum of A System of Particles

    It's 7 right? So, would that make the initial magnitude 5?
  7. S

    Linear Momentum of A System of Particles

    At time t = 0, a ball is struck at ground level and sent over level ground. The figure below gives the magnitude p of the ball's momentum versus time t during the flight. (p1 = 7.0 kg·m/s and the vertical axis is marked in increments of 0.5 kg·m/s.) At what initial angle above the horizontal is...
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    Vectors problem trouble

    The two vectors a and b have equal magnitudes of 13.0 m and their angles are θ1 = 30° and θ2 = 100°. Find the components of their vector sum, r. I know this is a very simple problem, but I can't get it! And it is frustrating me to no end. I know the y component of the sum is 16.3. (I...
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    Finding An Initial Speed, Intro to Physics Question

    A boy tosses a coin straight up to 2.8 m. Suppose the height when the coin leaves his hand is 1.2 m. What was the initial speed of the coin when it left his hand? I'm just confused as to what equation to use. And I don't know whether to assume the acceleration is -9.8 m/s^2. Thanks.
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