Study Guide for Examination #4

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1. 32 degree F corresponds to ____Celsius.

a. 43

b. 140

c. 79

d. 0

2. In order to use a substance to make a thermometer the substance must _______with a temperature change.

a. expand

b. contract

c. change

d. change linearly

3. How many kilocalories of heat are required to heat 750 g of water from 35 degree C to 55 degree C?

 a. 15

b. 1500

c. 1.5x10⁴

d. 6.3x10⁴

4. The density of a given amount of water _____as the temperature decreases from 4 degree C to 0 degree C.

a. decreases

b. increases

c. remains constant

d. none of the above

5. When a solid melts,

a. the temperature of the substance increases

b. the temperature of the substance decreases

c. heat leaves the substance

d. heat enters the substance

6. The density of the wire is increased 9 times. What happens to the speed of the waves on

 the wire?

a. it increases by 3

b. it triples

c. it is reduced by 3

d. it is reduced by 1/3

7. At the bottom of a lake, a sound pulse is generated which is received by an observer 25.0

m above the surface of the lake in 0.100 s. Both the lake and air are at a temperature of 20.0 Celsius degrees. How deep is the lake? (assume the speed of sound in fresh water at 20 Celsius is 1482 m/s).

8. The wave traveling on the string has a wavelength of 0.250 m and amplitude of 2.5

nm. Write an equation describing the waves as it travels toward the –x-axis.

 

9. A transverse wave is traveling on a string. The displacement y of a particle from its

equilibrium position is given by y=(0.021 m) sin[25t – 2x]. The linear density of the string is 1.6x10^-2 kg/m. What is the tension in the string?

 

10. A 1.5 m steel wire is heated from room temperature 22 degree C to 150 degree C. How

much does its length change?  (= 12x10^-6/degree C)

11. The intensity of the sound produced at a live rock concert is 0.75 W/m² above the threshold of hearing (1x10 ^-12 W/m²). What is the sound intensity level in dB?

12. How much heat is required to raise 10.0 kg of water from 25 degree C to 55 degree C?

 

13. The heat needed to vaporize an amount of liquid mercury at 357 degree Celsius is 4.9x10⁴ J. What is the mass of the mercury? (Latent heat of vaporization for mercury is 2.9x10⁵ J/kg)