Which of the following main-sequence turnoffs indicates the oldest globular cluster?
A.) O5.
B.) O9.
C.) B7.
D.) B2.
E.) G2
Ans: E.) G2
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Compare the kinetic energy of two balls: ball 1: mass m thrown with speed 2v ball 2: mass 2m thrown with speed v
A. KE1 = 4KE2 B. KE1 = KE2 C. 2KE1 = KE2 D. KE1 = 2KE2
Four samples of steel, lead, alcohol, and glass all have the same mass and are all initially at 20°C. After 100 calories of heat are added to each sample, the final temperatures are 38.2°C for the steel, 85.6°C for the lead, 23.4°C for the alcohol, and 30°C for the glass. Which of these four materials has the largest specific heat capacity?
A. The alcohol B. The steel C. The lead D. The glass E. All of these choices have the same heat capacity, since all absorbed 100 cal of heat
A conducting sphere of radius 20.0 cm carries an excess charge of +15.0 µC, and no other charges are present. (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )
The potential (relative to infinity) due to this sphere at a point 12.0 cm from its center is closest to A) zero. B) 674 kV. C) 1130 kV. D) 3380 kV. E) 9380 kV.
Impulse: A batter applies an average force of 8000 N to a baseball for 1.1 ms. What is the magnitude of the impulse delivered to the baseball by the bat?
Fill in the blank(s) with the appropriate word(s).