Which of the following molecules has the highest boiling point?
A) BH3
B) NH3
C) CH4
D) All of the above should have the same boiling point.
Answer: B
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Two concentric imaginary spherical surfaces of radius R and 2R, respectively, surround a positive point charge Q located at the center of the surfaces. When compared to the electric flux ?1 through the surface of radius R, the electric flux ?2 through the surface of radius 2R is
A.
.B.
.C.
D.
E.
How can we see through the interstellar medium?
A) by observing in high-energy wavelengths such as X-rays and long wavelengths of light such as radio waves B) by observing only the brightest visible sources C) by using only the biggest telescopes D) by using telescopes above the Earth's atmosphere E) We cannot see through the interstellar medium.
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is parallel to the magnetic field?
A) zero B) 0.41 m?N C) 0.47 m?N D) 0.52 m?N E) 0.59 m?N
A satellite with a rest mass of 200 kg and a speed of 0.800c and a second satellite with a rest mass of 100 kg and a speed of 0.600c are traveling toward each other in deep space. The satellites collide and stick together
What is the rest mass of the combined object after the collision? A) 300 kg B) 389 kg C) 416 kg D) 457 kg E) 587 kg