Are cosmic rays electromagnetic waves? Why or why not?
What will be an ideal response?
No, because they are subatomic particles traveling at high speeds.
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A sample of tendon 3.00 cm long and 4.00 mm in diameter is found to break under a minimum force of 128 N
If instead the sample had been 1.50 cm long and of uniform composition and cross-sectional area, what minimum force would have been required to break it? A) 32 N B) 64 N C) 128 N D) 256 N E) 512 N
A horizontally-projected beam of protons travelling at 55 km/s travels between two parallel plates separated by 7.4 cm, and 12 cm long, between which there is an electric field of 7.2 mV/m upward. If the beam enters the region at exactly midway vertically between the plates, and exits the region 7.2 microns closer to the lower plate, where relative to the lower plate would a beam of electrons – injected into the region at the same location – exit? The proton mass is 1.67 x 10-27 kg and that of the electron is 9.11 x 10-31 kg.
A. 0.9 cm B. 5.1 cm C. 2.3 cm D. 4.6 cm
Why should resource use in the U.S. have increased by a factor of 17 in the past century? Suggest as many different reasons backed by some evidence as you can
What will be an ideal response?
Rolling without slipping depends on
A) kinetic friction between the rolling object and the ground. B) static friction between the rolling object and the ground. C) normal force between the rolling object and the ground. D) tension between the rolling object and the ground. E) the force of gravity between the rolling object and the earth.