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A child of mass 50.0 kg stands 2.00 m from the center of a horizontal circular disc of radius 4.00 m and mass 200 kg. The disc is mounted on a frictionless, vertical axis. Initially both the child and the disc are at rest. (Hint: so what is their combined initial angular momentum?) The child then begins to run in a counter clockwise direction. Shortly after the child starts running, it is observed that the disc attains a steady angular velocity of ? = -0.125rad/s in a clockwise sense. The moment of inertia of the flat disc is given by: I = 1/2 mR^2
Calculate the angular momentum of the disc (NOT the child) about the central vertical axis when the child has reached its steady (constant) tangential speed. Also calculate the steady tangential speed at which the child is running.
A diverging lens (f = â€"12.0 cm) is located 23.0 cm to the left of a converging lens (f = 35.0 cm). Determine the distance of the final image relative to the converging lens
A ship sets out to sail to a point 148 km due north. An unexpected storm blows the ship to a point 148 km due east of its starting point. (a) How far (in km) and (b) in what direction (as an angle from due east, where north of east is a positive angl..
A cart that is initially at rest moves down a slope that is inclined at 5o above the horizon, What is its final speed at the end of the slope
A 2.0 kg block is pushed against a horizontal spring and released. The spring sends the block sliding across a tabletop. find the distance to which the spring was initially compressed
A goldfish is swimming inside a spherical bowl of water having an index of refraction n = 1.333. determine the apparent distance of the goldfish from the wall
A laser used in a rock concert emits a red light with a wavelength of 721 nm. Calculate the frequency of the light
A stone is thrown from the top of a cliff that is 34.6 m high at a velocity of 13 m/s 230 above the horizontal. How long does it take to hit the ground below the cliff
An electron is in the fifth Bohr orbit of hydrogen. Calculate the time required for the electron to circle the nucleus
An RLC circuit has a resistance of 2 komega, a capacitance of 32 uF, and an inductance of 52 H. obtain the phase shift between the current and the voltage
A 1000.0 kg car traveling at 50.0 miles per hour on a long, What was the average coefficient of sliding friction between the car's tires and the road
Two events occur in an inertial system at the same time, but 7200 km apart. What is the time difference between the two events
A radio station with a power of 16kW sends out an omnidirectional wave at 2.1MHz. What is the electromagnetic wave's wavelength
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