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1. The Fermi Gamma-ray Space Telescope, launched in 2008, can detect gamma rays with energies ranging from 10 keV to 300 MeV. For each of those energy extremes, ?nd the resulting kinetic energy and speed of an electron created by the gamma ray as part of an electron-positron pair. Assume that the electron has half of the gamma ray's energy.
2. Gamma-ray detectors like the one described in the preceding problem often use calorimetry to determine gamma-ray energies. Suppose a beam of 100-MeV gamma rays strikes a target with a mass of 2.5 kg and speci?c heat 430 J/(kg # K). How many gamma rays are needed to raise the target's temperature by 10 mK?
A 10.0 k resistor and a capacitor are connected in series and then a 10.0 V potential difference is suddenly appliedacross them. The potential difference across the capacitor rises to9.00 V in 1.35 µs.
An 18 g rifle bullet traveling 200 m/s buries itself in a 3.5 kg pendulum hanging on a 2.8 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of the pendulum's displacement. vertical m hor..
How much charge can be placed on a capacitor with air between the plates before it breaks down if the area of each plate is 9.00 cm2
Black holes can be characterized by their event horizons.
a tennis player swings her 1200 g racket with a speed of 10.9 ms. she hits a 60 g tennis ball that was approaching her
Two 2.0-g pith balls hang in air on essentially weightless cotton threads 50-cm long from a common point of support. Find the magnitude of the charge on each ball
What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with the following radius
A 55.0 kg ice skater is moving at 4.00 m/s when she grabs theloose end on a rope, the opposite end of which is tied to a pole. Determine the force exerted by the horizontal rope on her arms
Two identical particles, both of mass m and charge q, What is the speed of each particle when they are a distance 2d apart
A spring is hung from the ceiling. A 0.509 -kg block is then attached to the free end of the spring. Find the angular frequency of the block's vibrations
The velocity of a 1.9 kg block sliding down a frictionless inclined plane is found to be 1.53 m/s. 1.90 s later, it has a velocity of 7.04 m/s. What is the angle of the plane with respect to the horizontal
a pencil 15.7 cm long is released from a vertical position with the eraser end resting on a table. the eraser does not
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