How can you show the relationship between applied torque and change in angular momentum?
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Q: what that torque (r X F) should do to the direction of the angular momentum vector.
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A: The expression for the torque is,
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A:
Q: A B C E D
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Q: Question 3: Calculate the net torque (magnitude and direction) on the beam in Figure below…
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Q: determine whether each object SPED UP THE ENTIRE TIME & changed direction) choose all that apply.
A: Object 1As we can see that the angular velocity increases as time elapsedso speed up is correctrest…
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- The 2.0 kg, uniform, horizontal rod is seen from the side as shown above. What is the gravitational torque about the point shown?Conservation of Angular Momentum Given data on two disks, such as masses and inner/outer diameters/radii, and the initial angular velocities of the 2 disks, use the conservation of angular momentum principle to calculate the common angular velocity after the two disks are allowed to contact each other and spin together. Or, given the common final angular velocity, solve for unknowns such as the initial angular velocity of one of the disks. Or, given data on the starting and final angular velocities and some data on the disks, solve for unknowns such as moments of inertia, masses or diameters/radii. EXAMPLE Two metal disks have masses m1=3.45 kg and m2=UNKNOWN kg, and each has a radius of 8.31 cm. (You may ignore the inner hole for both disks assume that it is very small.) They spin on cushions of air in a standard rotational dynamics apparatus. Initially, disk #1 is spinning counterclockwise at 6.02 rad/s and disk #2 is spinning clockwise at 2.50 rad/s. A pin is removed that drops disk…Which will cause a greater increase in the angular velocity of a disk: doubling the torque applied or halving the radius at which the torque is applied? Explain.
- 112... Astronomy In a little more than 5 billion years, our Sun will collapse to white dwarf approximately 16,000 km in diameter. (Ignore the fact that the Sun will lose mass as it ages.) (a) What will our Sun's angular momentum and rotation rate be as a white dwarf? (Express your answers as multiples of its present-day values.) (b) Compared to its present value, will the Sun's rotational kinetic energy increase, decrease, or stay the same when it becomes a white dwarf? If it does change, by what factor will it change? The radius of the Sun is presently 6.96 × 108 m. Example 9-14When a diver first leaves the diving platform their body is stretched out. When they tuck, what happens to their angular velocity and why?If you jump from a diving board and find that your body is rotating forward, you can spin your arms to stop the rotation and make your body land feet first. Explain in which direction you would rotate your arms and how this would help.