Question

# What is the change in length of a metal rod with an original length of 4...

1. What is the change in length of a metal rod with an original length of 4 m, a coefficient of thermal expansion of 0.00002/ ° C, and a temperature change of 30° C?

 1 2.4 mm 2 12 mm 3 1.2 mm 4 24 mm
2. Determine the number of electrons passing through a point in the wire in 8 minutes when the current is 10 A.

 a. 3 * 1016 electrons b. none of these c. 4,800 electrons d. 1.6 * 1019 electrons
3. Points A and B have electric potentials of 12 V and 20 V, respectively. How much work would be required to take 3 C of positive charge from A to B?

 1 36 J 2 24 J 3 60 J 4 zero
4. *A patient has a body temperature of 310 K. Should you be concerned?

 Not really, it's 101 degrees Fahrenheit Not terribly, it's 97 degrees Fahrenheit No, it's 98.6 degrees Fahrenheit
5. You are riding on a roller coaster. Which case would produce a zero acceleration?

 a. roller coaster making a sharp turn b. roller coaster speeding up down a hill c. roller coaster slowing down up a hill d. none of the choices
6. A 3.0 cm tall object is placed along the principal axis of a thin convex lens of 30.0 cm focal length. If the object distance is 40.0 cm, which of the following best describes the image distance and height, respectively?

 17.3 cm and 7.0 cm 120 cm and 9.0 cm 17.3 cm and 1.3 cm 120 cm and 1.0 cm
7. A 1 000-kg sports car accelerates from zero to 25 m/s in 7.5 s. What is the average power delivered by the automobile engine?

 20.8 kW 30.3 kW 41.7 kW 52.4 kW
8. What is the total pressure on a diver at a depth of 45 m under the sea? Atmospheric Pressure is 101 kPa. The density of sea water is 1,025 kg/m3.

 a. 553 kPa b. none of the choices c. 0 Pa d. 101 kPa
9. An ACME operating table has four legs. Each leg is square, closed on the end and measures 0.10m X 0.10m. If the table weighs 1200 N and the patient on the table weighs 800 N, determine the total pressure exerted on the operating room floor.

 a. 100,000 Pa b. 200,000 Pa c. 2,000 Pa d. 50,000 Pa
10. The pressure on an oxygen tank reads 300 kPa. An equivalent reading is

 a. 300 Pa b. 43.5 psi c. 4 atm d. 100 mm Hg
11. If water is moving at a speed of 0.25 m/s through a tube with a cross-sectional area of 0.05 m2, what is the flow rate?

 .013 m3/s .05 m3/s .25 m3/s 5 m3/s
12. An object of mass 0.50 kg is transported to the surface of Planet X where the object's weight is measured to be 20 N. The radius of the planet is 4.0 ´ 10 6 m. What is the mass of Planet X? ( G = 6.67 ´ 10 -11 N ×m 2/kg 2)

 13 ´ 1019 kg 17 ´ 1022 kg 9.6 ´ 1024 kg 21 ´ 1025 kg

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