A hole in a brass plate has a diameter of 1.200 cm at 20°C. What is the diameter of the hole when the plate is heated to 220°C? The coefficient of linear thermal expansion for brass is 19 × 10-6 K-1
A) 1.195 cm B) 1.200 cm C) 1.205 cm D) 1.210 cm
C
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Force on a Moving Charge: A geophysicist measures the magnetic force on a proton that is moving vertically downward at a point 1.996 km/s at the earth's equator. At that location, the earth's magnetic magnetic field is horizontal and has a strength of 0.40 × 10-4 T. What are the magnitude and direction of the force she will measure? (e = 1.60 × 10-19 C)
What will be an ideal response?
Fermium-253 has a half-life of 3.00 days. A sample of fermium has 7.37 × 107 nuclei. How long will it take for there to be only 3.36 × 106 fermium nuclei in this sample?
A) 2.75 days B) 9.80 days C) 13.4 days D) 15.7 days E) 58.6 days
A super-insulated house is at a temperature of 20°C. The temperature outside is 0°C. The surface area of the house is 200 m2, and the emissivity is 1 . Approximately how much energy is radiated (in W) per second?
a. 20 000 b. 2 000 c. 200 d. 2 e. 0.2
Using a lever to move a rock reduces the force a person must exert. What does it do to the work the person must do?
a. it reduces the work also c. the work increases b. the work stays the same d. none of the above