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  • physics help please!?

    Calculate the moment of inertia (in kg·m2) of a skater given the following information.

    (a)

    The 64.0 kg skater is approximated as a cylinder that has a 0.120 m radius.

     _____kg·m2

    (b)

    The skater with arms extended is approximately a cylinder that is 56.0 kg, has a 0.120 m radius, and has two 0.950 m long arms which are 4.00 kg each and extend straight out from the cylinder like rods rotated about their ends.

    2 AnswersPhysics11 hours ago
  • Attachment image

    Physics help!!1?

    As shown in the figure below, we have a square one meter on a side that is free to rotate about an axis perpendicular to the plane of the square, a distance a from one side and a distance b from the other side.

    Two forces,F1 and F2, are applied to diagonally opposite corners, and act along the sides of the square, first as shown in case (i) and then as shown in case (ii) of the drawing. In each case the net torque produced by the forces is zero. If the magnitude ofF2 is 6 times that of F1,find the distances a and b that locate the axis. It should be noted that a and b are not drawn to scale.a =____ mb =____ m

    Physics1 week ago

  • Please help! I can't get these two physics problems.?

    1.A 77.0-kg ice hockey goalie, originally at rest, catches a 0.150-kg hockey puck slapped at him at a velocity of 19.0 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their final velocities be in this case? (Assume the original direction of the ice puck toward the goalie is in the positive direction. Indicate the direction with the sign of your answer.)

    a.puck ____ m/s

    b.goalie ____ m/s

    2.A 0.260-kg billiard ball that is moving at 3.80 m/s strikes the bumper of a pool table and bounces straight back at 3.04 m/s (80% of its original speed). The collision lasts 0.0160 s. (Assume that the ball moves in the positive direction initially.)

    (a) Calculate the average force exerted on the ball by the bumper. (Indicate the direction with the sign of your answer.)

    (b) How much kinetic energy in joules is lost during the collision? (Enter the magnitude.)

    (c) What percent of the original energy is lef

    2 AnswersPhysics1 month ago

  • Help please! Can't get these two physics problems?

    1.  0.260-kg billiard ball that is moving at 3.80 m/s strikes the bumper of a pool table and bounces straight back at 3.04 m/s (80% of its original speed). The collision lasts 0.0160 s. (Assume that the ball moves in the positive direction initially.)

    (a) Calculate the average force exerted on the ball by the bumper. (Indicate the direction with the sign of your answer.)

     N

    (b) How much kinetic energy in joules is lost during the collision? (Enter the magnitude.)

     J

    (c) What percent of the original energy is left?

    2. 0.0270 kg bullet moving horizontally at 500 m/s embeds itself into an initially stationary 0.500 kg block.

    (a) What is their velocity just after the collision?

     m/s

    (b) The bullet-embedded block slides 8.0 m on a horizontal surface with a 0.30 kinetic coefficient of friction. Now what is its velocity?

     m/s

    (c) The bullet-embedded block now strikes and sticks to a stationary 2.00 kg block. How far does this combination travel before stopping?

     m

    1 AnswerPersonal Finance1 month ago