With a Hubble constant of 70 km/sec/Mpc, the critical density would be
A) 6.23 × 10-23 g/mole.
B) 3 × 10-31 g/cc.
C) 1.4 g/cc.
D) 4 × 10-36 g/cc.
E) 9 × 10-27 kg/m3.
E
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A simple junction transistor consists of three semiconductor sections consisting of
A) pnp semiconductors. B) npn semiconductors. C) either pnp or npn semiconductors. D) none of the given answers
Projectile Motion: As shown in the figure, a heavy rock is shot upward from the edge of a vertical cliff. It leaves the edge of the cliff with an initial velocity of 15 m/s directed at 25° from the vertical and experiences no appreciable air resistance as it travels. How high is the cliff?
Fill in the blank(s) with the appropriate word(s).
A conducting bar of length L rotates with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA ? VP?
a.
?12 mV
b.
+8.0 mV
c.
?8.0 mV
d.
+12 mV
e.
?16 mV
The force of a falling apple hitting the ground depends upon
A) the speed of the apple just before it hits the ground. B) the time of contact with the ground. C) whether or not the apple bounces. D) all of the above