Recent content by chicagobears

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    Resistance of Wires: 2L & A vs 2a & A

    Yeah but I kinda want to know how to solve it
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    Resistance of Wires: 2L & A vs 2a & A

    Thanks. However, is their any way to do this without calculus? I understand what it is saying but my class is mainly comprised of pre-calculus students witha few calculus students like me. Is their even a way to do this without calculus?
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    Resistance of Wires: 2L & A vs 2a & A

    Homework Statement Two wires both 2L. Wire 1 has a cross sectional area of A. Wire 2 cross sectional area starts at 2a but gradually gets thinner till it is A. Both have the same resitivity constant. Which one has more resistance? Homework Equations R=kL/A The Attempt at a Solution...
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    How Is the Coefficient of Friction Calculated for an Amusement Park Ride?

    yea that was my mistake...
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    How Is the Coefficient of Friction Calculated for an Amusement Park Ride?

    No need to answer. I get this now...
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    How Is the Coefficient of Friction Calculated for an Amusement Park Ride?

    Homework Statement In an amusement park ride, people are spun at 5 radians per sec in a 3 m cylinder. What is the coefficient of friction to prevent people from falling down? Homework Equations Centripetal Force= (mv^2)/r Force of friction=(mu)(mg) Velocity=(r)(ω) The Attempt at a...
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    A 30 kg child moving at 4 m/s jumps onto a 50 kg sled that is initiall

    Thanks PhantomJay. I read about it and it makes sense. We haven't learned momentum yet so I was confused on what they were doing.
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    A 30 kg child moving at 4 m/s jumps onto a 50 kg sled that is initiall

    Homework Statement A 30 kg child moving at 4 m/s jumps onto a 50 kg sled that is initially on a frictionless surface. Find the speed of the child-sled system after it jumps onto the sled I know the solution looks like this (30)(4)=(30+50)(v) but i don't know why and what that equation is?