Based on the number of galaxies visible in the Hubble Deep Field (Figure 16.1 in your textbook), the estimated number of galaxies in our observable universe is about ________
A) 50,000 B) 100 million C) 100 billion D) Infinity
C
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The internal energy of a substance can be increased by
a. doing work on it b. letting it do work c. adding heat to it d. extracting heat from it e. none of the above
9.0 g of water in a 2.0-L pressure vessel is heated to 300°C. What is the pressure inside the container? (R = 0.082 L • atm/mol • K, one mole of water has a mass of 18 grams)
a. 12 atm c. 24 atm b. 16 atm d. 32 atm
How many turns should a 10-cm long ideal solenoid have if it is to generate a 1.5-mT magnetic field when 1.0 A of current runs through it? (?0 = 4? × 10-7 T ? m/
A) A) 12 B) 15 C) 120 D) 1200 E) 3200
Two waves are described by y1 = 6 cos 180t and y2 = 6 cos 186t, (both in meters). With what angular frequency does the maximum amplitude of the resultant wave vary with time?
a. 366 rad/s b. 6 rad/s c. 3 rad/s d. 92 rad/s e. 180 rad/s