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A 45 kg figure skater is spinning on the toes of her skates at 1.0 rev/s. Her arms are outstretched as far as they will go. In this orientation, the skater can be modelled as a cylindrical torso (40 kg, 20 cm average diameter, 160 cm tall) plus two rod-like arms (2.5 kg each, 66 cm) attached to the outside of the torso. The skater then raises her arms straight above her head, where she appears to be a 45 kg, 20-cm-diameter, 200-cm-tall cylinder. What is her new rotation frequency, in revolutions per second?
A 440.0-N force accelerates a go-cart and its driver from 10.1 m/s to 18.1 m/s in 5.20 s. What is the mass of the go-cart plus driver
A spaceship of mass 2.30×106kg is cruising at a speed of 5.30×106m/s when the antimatter reactor fails, What is the speed of the third piece
for uniform circular motion describe how the speed velocity and acceleration change with time. for each vector quantity
the frequncy doubled output of a laser has a wavelength of 532nm. if each pulse of light has a total energy of 0.550j
Suppose electrons in a TV tube are accelerated through a potential difference of 2.00 104 V from the heated cathode, At what speed would the electrons impact the phosphors on the screen
explain the shape of the distribution of sample means.
The pilot (mass m) of an aerobatic glider (an airplane with no engine) flies her aircraft in a loop (a vertical circle of radius R) so that her head always points toward the inside of the loop. What will the scale read at the lowest point of the lo..
What is an average magnitude of the Pointing vector 5.0miles from a radio transmitter broadcasting isotropically with an average power of 250-kW?
A 10,000 kg railroad car is rolling at 2 m/s when a 400 kg load of gravel is suddenly dumped in. What is the railroad cars speed just after the gravel is dumped in.
a beam of polarized light strikes two polarizing sheets.The characteristic directions of the second is 90 degree with respect to incident light. Find angle betta for a transmitted beam intensity that is 0.10 times the incident beam intensity
Astronomers have recently discovered a new planet in a faraway solar system, with a radius of roughly 380 km. calculate the minimum density of the planet
A car of mass 2000 kg rounds a circular turn of radius 10 m. If the road is flat and the coefficient of static frictionbetween the tires and the road is 0.8, how much work is done on the car by friction
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