Neutrinos travel at very high speeds (close to the speed of light). How does this fact imply that neutrinos cannot make up the bulk of the dark matter in galaxies?
A) Their high speeds mean neutrinos cannot have much mass.
B) Their high speeds tell us that neutrinos interact only through the weak force and gravity.
C) Their speeds of neutrinos mean that neutrinos would escape from galaxies.
Answer: v
You might also like to view...
Radiation dosage is commonly measured in
A) rads. B) rems. C) joules. D) none of the above
Which of the following moons has the most substantial atmosphere?
A) Titan B) Ganymede C) Io D) Europa E) Mimas
The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil?
A) 70 V B) 30 V C) 100 V D) 400 V E) 480 V
A piece of copper of mass 100 g is being drilled through with a 1/2" electric drill. The drill operates at 50.0 W and takes 30.0 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. 40.6°C c. 31.0°C b. 38.8°C d. 27.3°C