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The disk of the Milky Way is about 105 light years in diameter. A cosmic-ray proton enters the galactic plane with speed v = 0.99c.
a) How long does it take the proton to cross the galaxy from out viewpoint?
b) How long does the proton think it takes?
c) How wide is the galaxy to the proton (in its direction of motion)?
A long straight ideal solenoid of radius 6 cm, with 150 turns/m passes (on axis) through the center of a flat circular coil, What is the total flux across the coil, as a function of time
If 42.8 cm of copper wire (diameter = 1.36 mm, resistivity = 1.69 x 10-8?·m) is formed into a circular loop and placed perpendicular to a uniform magnetic field that is increasing at the constant rate of 11.9 mT/s
In one day, a 75 kg mountain climber ascends from the 1400 m level on a vertical cliff to the top at 2380 m. find her change in gravitational potential energy on the second day
A long, straight wire runs along the axis of the solenoid, carrying a current of 15. Find out the magnitude of the net magnetic field a radial distance of 0.80 from the straight wire.
You are at a rock concert, and the sound intensity reaches levels as high as 120 dB. Calculate the amplitude of this oscillating force
The spring stretches 5.0 cm from its previous equilibrium position toward the two spheres. Calculate the spring constant.
A woman stands on a scale in a moving elevator. Her mass is 73.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. What does the scale read during the acceleration
the membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space.
a hollow metal sphere has inner and outer radii of 7 cm and 10 cm radii. a point charge is located at the center is
A barge of mass 5x 10^4 kg is pulled along the Erie Canal by two mules, walking along towpaths parallel to the canal on either side of it. The ropes harnessed to the mules make angles of 45° to the canal.
What is the kinetic energy of a ball of mass 16.1 kg at the apex (highest point) of its trajectory, if it is thrown with an initial speed of 45 mph and an initial angle of 42.8 o with respect to the horizontal?
Some sharks respond to very weak electric fields, as weak as 1.0 µV/m. To grasp how weak this field is, how far apart would the plates have to be
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