A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy?
a. 0.50 B
b. 1.4 B
c. 2.0 B
d. 0.71 B
e. 1.7 B
d
Physics & Space Science
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A piece of copper of mass 110 g is being drilled through with a 1/2" electric drill. The drill operates at 25.0 W and takes 25.0 s to bore through the copper. If all the energy from the drill heats the copper, find the copper's increase in temperature. ccopper = 387 J/kg/°C
a. 18.4 C° b. 23.5 C° c. 14.7 C° d. 22.0 C° e. 29.4 C°
Physics & Space Science
A main difference between a radio wave and a sound wave is
A) frequency. B) wavelength. C) energy. D) amplitude. E) medium or no medium.
Physics & Space Science
How much heat is necessary to change 10 g of water at 30°C into steam at 100°C?
a. 0.07 kcal b. 0.7 kcal c. 6.1 kcal d. 0.67 kcal
Physics & Space Science
When it is summer in the United States, in Australia it is
a. winter. b. summer. c. spring. d. fall.
Physics & Space Science