Recent content by ysk1

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    Parallel Plate Capacitor True or False

    I keep getting the questions wrong. I'm so frustrated. I'd appreciate it if anyone can tell me what's wrong. Which statements are correct/incorrect for two oppositely charged, isolated parallel plates (Isolated means that the charge stays constant ): (C=capacitance, U=stored energy, +Q and...
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    Impulse and momentum of a cart down a ramp

    Question: A 500 g cart is released from rest 1.0 m from the bottom of a frictionless, 30 degrees ramp. The cart rolls down the ramp and bounces off a rubber block at the bottom. During collision, the cart and the ramp are in contact for 0.0267 sec. The average force exerted by the ramp on the...
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    Circular Motion Problems: Solving for Speed, Period, and Acceleration

    I'm stuck on the questions below. Please tell me how to solve them. Thank you. 1. How fast must a plane fly along the Earth's equator so that the sun stands still relative to the passengers? In which direction must the plane fly, east to west or west to east? Give your answer in km/hr...
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    Newton's 2nd law involving pulley

    Can inextensibility of rope also make acceleration of the movable pulley decrease to one-third, one-fourth, etc.?
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    Why Are Galilean Transformations Important in Understanding Relative Motion?

    I understand the concept of relative motion, but I don't know why I can't understand what Galilean Transformations are. Could anyone please explain it? Thank you.
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    Newton's 2nd law involving pulley

    How could you know which configuration of the ropes will give that condition?
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    Newton's 2nd law involving pulley

    I came across some questions where one box's magnitude of acceleration differed from another box's magnitude of acceleration. Please explain why and how this can be true. Thank you.
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    Angle with respect to x or y axis.

    Now I got it. I had made a small mistake. Mesmer, thank you for your help. =)
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    Angle with respect to x or y axis.

    I still don't get this. Please tell me how to do this.
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    Master Distance-Time Graphs with these Helpful Tips!

    That's right.
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    Master Distance-Time Graphs with these Helpful Tips!

    Hint: Slope of the d VS t graph is its velocity.
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    Angle with respect to x or y axis.

    I tried 162.9 degrees but I was told it's wrong. It's very frustrating.. :( The question should explain what it means by "with respect to positive x-axis". What should I do?
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    DESPERATE NEED OF HELP ON THIS Physics PROBLEM

    First, change km/h to m/s for convenience. Then set up the equation x = Vit + (1/2)at^2 for each object: Police car: x + 13.889 = 25t + t^2 ------> x = 25t + t^2 - 13.889 Speeder: x = 38.889t Now, make x of police car and x of speeder equal each other and you get: 25t + t^2 -...
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    Optimal Coordinate System for Applying Newton's 2nd Law on an Inclined Plane

    Now I have problem with the question below: Write equations for the constraints and other given information In this problem, the fact that the length of the string does not change imposes a constraint on relative accelerations of the two blocks. Find a relationship between the x component...
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    Angle with respect to x or y axis.

    A question tells me to find an angle of a vector F with respect to positive x-axis. Suppose the vector F points 17.1 degrees west of north. Then if I were to find angle of this vector with respect to positive x-axis, I add 17.1 degrees and 90 degrees and get 107.1 degrees, right? On a...