Two objects are dropped from a bridge, an interval of 1.0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation
A) decreases.
B) increases at first, but then stays constant.
C) increases.
D) stays constant.
E) decreases at first, but then stays constant.
C
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How does an accretion disk around a neutron star differ from an accretion disk around a white dwarf?
A) The accretion disk around a neutron star is much hotter and emits higher-energy radiation. B) The accretion disk around a neutron star is made mostly of helium, while the accretion disk around a white dwarf is made mostly of hydrogen. C) The accretion disk around a neutron star is more likely to give birth to planets. D) The accretion disk around a neutron star always contains much more mass.
About how hot was the Big Bang when matter and energy "decoupled"?
A) 900 million K B) 15 million K C) 3,000 K D) 300 K E) 2.73 K
A long nonconducting cylinder (radius = 12 cm) has a charge of uniform density (5.0 nC/m3) distributed throughout its column. Determine the magnitude of the electric field 5.0 cm from the axis of the cylinder.
A. 25 N/C B. 20 N/C C. 14 N/C D. 31 N/C E. 34 N/C
What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 27°C, and he is in a room that is at a temperature of 17°C? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 65.7 W B) 60.3 W C) 64.8 W D) 68.4 W E) 62.6 W