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A ballet student with her arms and a leg extended spins with an initial rotational speed of 1.1 rev/s . As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg.m2 and her rotational velocity is 4.2 rev/s. Determine her initial rotational inertia.
An infinitely long line of charge has linear charge density 5.00×10?12C/m. Calculate the protons initial kinetic energy
Two identical launchers fire projectiles with the same initial velocity. One launcher is 3.54m above the ground and fires horizontally. what is the intial velocity of the projectiles
a balloon filled with helium has a volume of 1.0 x 10-3 l at 20 degrees celcius. what will be the balloons volume at 30
A cubical box 22cm on a side is constructed from 1.0cm -thick concrete panels. A 100 W light bulb is sealed inside the box. What is the air temperature inside the box
question the frequency of a steam train whistle as it approaches you is 538hz. after it passes you its frequency is
A mass m slides down a frictionless plane that is inclined at angle θ. Show, using the method in Section 5.3, that the normal force from the plane is the familiar mg cos θ.
Summarize current research about the issue and at least two credible sources. At least one reference source should discuss the issue from a pro and the other should discuss from a con perspective.
The pendulum of a regulator clock consists of a mass of 120 g at the end of a (massless) wooden stick of length 44 cm. What is the total energy (kinetic plus potential) of this pendulum
A large man sits on a four-legged chair with his feet off the floor. The combined mass of the man and chair is 95.0 kg. what pressure does each leg exert on the floor
Two children tug on a toy of mass 2.0 kg. Costa pulls with a force of 10.0N [W 30degrees S]. The toy slides with an acceleration of 2.5 m/s^2 in the direction of the net force.
A uniformly charged wire or radius R1=0.02m runs down the axis of a cylinder of inner radius R2=0.06m. Find the electric field at the surface of the wire
The total electric field consists of the vector sum of two parts. One part has a magnitude of E1 = 1300 N/C, Find the magnitude and direction of the total field
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