A ball is thrown with an initial speed of 60 m/s at an angle of 30° above the horizontal. What is the ball's horizontal displacement at the end of 4 seconds? Use g = 10 m/s2
A) 240 m
B) 60 m
C) 120 m
D) 210 m
E) 140 m
D
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A 2000 kg car is traveling at 20.0 m/s and then puts on the brakes and comes to a complete stop. The heat generated at the brakes due to stopping heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg 
What is the increase in the temperature of the brakes?
A. 75.3
B. 53.1
C. 23.9
D. 18.9
E. 12.4
When we see that a spectral line of a galaxy is broadened, that is, spanning a range of wavelengths, we conclude that
A) we do not have very good resolution of a star's orbital velocity. B) there are many stars traveling at extremely high orbital velocities. C) there are different Doppler shifts among the individual stars in the galaxy. D) we are actually measuring the orbital velocity of a cloud of atomic gas. E) we are actually measuring the orbital velocity of dark matter.
A 2.00-L container holds half a mole of an ideal gas at a pressure of 12.0 atm. What is the gas temperature? (R = 0.082 1 L/atm/mol/K)
a. 292 K b. 438 K c. 731 K d. 585 K e. 365 K
Which of the following two stick structures are different conformations of the same molecule?
A) a and c B) b and c C) a and d D) b and d E) none of the above