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An unwary football player collides with a padded goalpost while running at a velocity of 7.50 m/s and comes to a full stop after compressing the padding and his body 0.250 m.
(a) How long does the collision last? s(b) What is his deceleration? m/s2
Two disks are rotating about the same axis. Disk A has a moment of inertia of 4.59 kg·m2 and an angular velocity of +7.91 rad/s. What is the moment of inertia of disk B
Consider an alternating current of the form i(t) sin(2pit), where t is the time elapsed measured in seconds. (a) at what times is the magnitude of the current largest? (b) if this current were applied to a resistor, at what times would the magnitude ..
What is the magnitude of the magnetic flux through this circle due to the same magnetic field (with a magntiude of 0.220 T ), now in the + y -direction?
A source emits sound uniformly in all directions. There are no reflections of the sound. At the distance r1 from the source the sound is 3.9 dB louder than it is at a distance r2 from the source. What is the ratio r1/r2.
Light of wavelength 550. nm in air is found to travel at 1.96x10^8 m/s in a certain liquid. Determine the frequency of the light in air
It takes an elevator 2.4 min to raise a vehicle with a mass of 356 kilogram from the floor to a height of 8 m. Determine what size motor does it take to do the job
You are an astronaut in the space shuttle pursuing a satellitein need of repair, How long will it take to overtake the satellite if youreduce your orbital radius by 1.0 km
two equally charged insulating balls each weigh 0.42 g and hang from a common point by identical threads 40 cm long.
a sewing machine needle moves with a rapid vibratory motion rather like shm as it sews a seam. suppose the needle
The power radiated by a distant star is 6.2 x 10^27 W. The radius of the star, which may be considered a perfect radiator, is 1.06 x 10^10 m. Determine the surface temperature of the star.
A pulsar is a rapidly rotating neutron star that emits a radio beam the way a lighthouse emits a light beam. We receive a radio pulse for each rotation of the star. The period T of rotation is found by measuring the time between pulses. The pulsar..
A 32.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 21.00 m. Calculate the mechanical energy lost due to friction
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