What, approximately, are the dimensions of the smallest object on Earth that the astronauts can resolve by eye at 200 km height from the space shuttle? Assume ? = 500 nm light and a pupil diameter D = 0.50 cm. Assume eye fluid has an average n = 1.33.
A. 150 m
B. 100 m
C. 250 m
D. 25 m
E. 18 m
Answer: E
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A negatively charged rubber rod is brought near the knob of a positively charged electroscope. The result is that:
A) electroscope leaves will move farther apart B) the rod will lose its charge C) electroscope leaves will tend to collapse D) electroscope will become discharged E) nothing noticeable will happen
Exhibit 5-1
A 2.30-kg mass is suspended from the ceiling and a 1.70-kg mass is suspended from the 2.30-kg mass, as shown. The tensions in the strings are labeled 
and 
.
?
?
Use this exhibit to answer the following question(s).
Refer to . The string supporting the 1.70-kg mass is cut. The magnitudes of the tension in string 1 before and after string 2 is cut are
A.
= 22.5 N; 
= 5.80 N. B.
= 39.2 N; = 5.80 N.C.
= 22.5 N; = 22.5 N.D.
= 39.2 N; = 22.5 N.E.
= 39.2 N; = 39.2 N.A student is sitting on the right side of a school bus when it makes a right turn. We know that the force of gravity acts downwards and a normal force from the seat acts upwards. If the student stays in place when the bus turns, we also know that there must be
a. no other force on the student. b. a force parallel to the seat directed forward on the student. c. a force parallel to the seat directed to the left on the student. d. a force parallel to the seat directed to the right on the student. e. a force parallel to the seat in a direction between forward and left on the student.
What is the current in the 15-? resistor when ? = 9.0 V?
a.
0.20 A
b.
0.30 A
c.
0.10 A
d.
0.26 A
e.
0.60 A