Two moons orbit a planet in circular orbits. Moon A has orbital radius R, and moon B has orbital radius 4R. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A) 20 days
B) 80 days
C) 160 days
D) 320 days
E) 5 days
C
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The water level in identical bowls, A and B, is exactly the same. A contains only water; B contains floating ice as well as water. When we weigh the bowls, we find that
A.
B.
C.
D.
the volume of the water.E.
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half life of the radioisotope is
a. 3 minutes b. 4 minutes c. 6 minutes d. 8 minutes e. 12 minutes
Which is more polar, a sulfur-bromine (S-Br) bond or a selenium-chlorine (Se-Cl) bond?
A) A selenium-chlorine bond should be more polar because of a greater difference in effective nuclear charge. B) A selenium-chlorine bond should be more polar because of a smaller difference in effective nuclear charge. C) A sulfur-bromine bond should be more polar because of a greater difference in effective nuclear charge. D) A sulfur-bromine bond should be more polar because of a smaller difference in effective nuclear charge.
A plane is moving due north, directly towards its destination. Its airspeed is 200 mph. A constant breeze is blowing from west to east at 40 mph. How long will it take for the plane to travel 200 miles north?
a. one hour c. less than one hour b. more than one hour d. more information is needed