We can study how galaxies evolve because ________
A) galaxies are transparent to visible light
B) we can watch as they interact in real time
C) the farther away we look, the further back in time we see
D) we are really smart astronomers
C
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When Nellie Newton hangs by the ends of a rope draped over a large pulley, the tension in each supporting vertical strand is
A) half her weight. B) equal to her weight. C) twice her weight. D) none of the above
What is "uniform motion?"
a. smooth motion b. motion with zero acceleration c. motion with constant velocity d. motion at a constant speed e. motion along a straight path
A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average stopping force exerted on the car?
A) 690 N B) 550 N C) 410 N D) 340 N
If a quasar has a recessional velocity of 2.7x 105 km/sec and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone? Hint: Note that the units of your result should be (km/sec)/Mpc to see what arithmetic process you need to do on a calculator
a. 50 km/sec/Mpc b. 9.7x 108 (km/sec)Mpc c. 75 km/sec/Mpc d. 0.013 km/sec/Mpc e. 273,600 km/sec/Mpc