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A young girl spins a hula hoop of mass 0.74 kg and radius 0.73 m around her waist. Assuming that the girl's waist is much smaller that the hoop, use the parallel axis theorem to compute the rotational inertia of the hula hoop about its axis of rotation.
A. 1.2 kg m^2
B. 1.6 kg m^2
C. 0.39 kg m^2
D. 0.79 kg m^2
The angular momentum of a flywheel having a rotational inertia of 0.125 kgm2 decreases from 3.0 to 2.0 kgm2/s in a period of 1.5 s. How much work was done on the wheel
The diagram on the left below shows two resistors in series with an ideal battery, in the diagram on the right; a third resistor has been added in parallel with R2. Calculating the resistance, current and potential difference.
A wave with a frequency of 1200 Hz propagates along a wire that is under a tension of 800 N. What will be the wavelength if the tension is decreased to 600 N and the frequency is kept constant
calculate the magnitude of the force if Q1 is 4 x 10^-9 coulombs and Q2 is 8 x 10^-12 coulombs and the distance between them is 3 x 10^-8 meters.
A guitar string is under a tension of T = 198N. The string has a mass of m = 99g and length L. What is the length of the string in m
A block of mass m = 4.43 kg is attached to a spring which is resting on a horizontal frictionless table. What is the maximum speed of the block
A .14kg baseball with an initial speed of 28m/s rebounds with a speed of 34m/s after being struck with a bat. What was the average force between ball and bat
John is sitting ( at rest) at the top of a slide that is inclined 25 deg with respect to the horizontal. how much does the thermal energy increase during John's trip down the slide
a magnifying glass creates a virtual image of the observed object. explain how it is possible that humans can see the
A square coil of wire with 15 turns and an area of 0.40 m2 is placed parallel to a magnetic field of 0.75 T. What is the magnitude of the average induced emf
A rubber ball filled with air has a diameter of 25.0 cm and a massof 0.540 kg. What force is required to hold the ball
A 3.5 m string is stretched between a pulley and a wave generator consisting of a plate oscillating up and down with small amplitude and frequency 150 Hz. What is the linear mass density of the string
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