The mass of a neutrino is
A) equal to the mass of an electron.
B) equal to the mass of a proton.
C) equal to the mass of a neutron.
D) less than the mass of an electron but its actual value is unknown.
E) zero.
D
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A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200. What is the friction force on the box if
(a) a horizontal 140-N push is applied to it? (b) a horizontal 175-N push is applied to it? What will be an ideal response?
A device that measures absolute air pressure is called a __________
Fill in the blank(s) with correct word
Astronaut Sarah leaves Earth in a spaceship at a speed of 0.280c relative to Earth. Sarah's destination is a star system 12.5 light-years away
(one light-year is the distance light travels in one year). According to Sarah, how far did she travel during the trip? A) 13.0 light-years B) 12.5 light-years C) 12.0 light-years D) 11.5 light-years E) 11.0 light-years
The main-sequence turnoff of a star cluster tell us the cluster's
A.) Age. B.) Mass. C.) Distance. D.) Composition. E.) Size.