The high ____________________ of quasars reveals to astronomers that they must be very distant
Fill in the blank(s) with correct word
redshift
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A copper plate has a hole with a diameter of 2.50 cm. A copper shaft with a diameter of 2.501 cm is to be inserted into the hole. If the linear coefficient of thermal expansion for copper is 
then what is the decrease in temperature the copper shaft has to be subjected to in order to allow the shaft to just fit inside the hole?
A. 23.5
B. 26.4
C. 30.1
D. 33.3
E. 39.5
Matter Waves: Electrons are accelerated to a speed of 4.0 × 104 m/s and are then aimed at a double-slit apparatus, where interference fringes are detected. If the electrons were replaced by neutrons, what speed must neutrons have to produce interference fringes with the same fringe spacing as that observed with the electrons? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, mneutron = 1.675 × 10-27 kg)
A. 2.2 × 101 m/s B. 7.3 × 107 m/s C. 1.7 × 106 m/s D. 9.3 × 102 m/s
Mars has a mass that is 1/10th the mass of the Earth and a radius that is 1/2 the radiusof Earth. Compare the force of gravity on Mar's surface to that on the surface of Earthusing the proportional relationship F is proportional toM/R2
a) Gravity on Mars is 10 times stronger than on Earth. b) Gravity on Mars is 1/10th as strong as on Earth. c) Gravity on Mars is 4/10ths as strong as on Earth. d) Gravity on Mars is 4 times stronger than on Earth. e) Gravity on Mars is equal to gravity on Earth.
You stand near the earth's equator. A positively charged particle that starts moving parallel to the surface of the earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the
earth are directed a. upward. b. downward. c. from south to north. d. from north to south. e. from east to west.