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Physics: Multiple Choice Questions

1. The density of ice is 0.92 g/cm3, and the density of seawater is 1.03 g/cm3. A large iceberg floats in Artic waters. What fraction of the volume of the iceberg is exposed?
A) 0.080%
B) 11%
C) 89%
D) 92%
E) 99%

2. During a typical workday (eight hours), the average sound intensity arriving at Larry's ear is 1.8 x 10-5 W/m2. If the area of Larry's ear through which the sound passes is 2.1 x 10-3 m2, what is the total energy entering each of Larry's ears during the workday?
A) 1.8 x 10-3 J
B) 2.2 x 10-4 J
C) 7.4 x 10-4 J
D) 1.1 x 10-3 J
E) 4.1 x 10-3 J

3. Alyssa went to her outside faucet to fill a 0.032-m^3 bucket with water to wash her car. Water exits with a speed of 0.64 m/s. The radius of the faucet is 0.0075 m. How long does it take to fill the bucket completely?
A) 9.0 s
B) 17 s
C) 190 s
D) 280 s
E) 890 s

4 Work may be expressed using all of the following units except:
A) N?m
B) joule
C) erg
D) ft?lb
E) watt

5. What are the SI units of the shear modulus?
A) N/m2
B) N/m
C) N?m
D) N/m3
E) N?m2

6. A child wants to pump up a bicycle tire so that its pressure is 2.5 x 105 Pa above that of atmospheric pressure. If the child uses a pump with a circular piston 0.035 m in diameter, what force must the child exert?
A) 120 N
B) 240 N
C) 340 N
D) 930 N
E) 1300 N

7. The coefficient of linear expansion of a certain solid is 9 x 10-6/C°. Assuming this solid behaves like most solids, what is its coefficient of volume expansion?
A) 9.1 x 10-6/C°
B) 27 x 10-36/C°
C) 27 x 10-6/C°
D) 729 x 10-6/C°
E) 729 x 10-36/C°

8. A cylinder with a radius of 0.120 m is placed between the plates of a hydraulic press. A 4.45 x 105 -N force is applied to the cylinder. What is the pressure on the end of the cylinder due to the applied force?

A) 9.84 x 106 Pa
B) 3.13 x 105 Pa
C) 6.18 x 106 Pa
D) 5.34 x 104 Pa
E) 3.71 x 106 Pa