Which of the following explains why the Big Dipper will look different 100,000 years from now than it does today?
A) Earth rotates once each day.
B) Earth orbits the Sun once each year.
C) The direction of Earth's axis in space precesses with a period of about 26,000 years.
D) Stars appear to move randomly relative to our Sun in the local solar neighborhood.
E) The universe is expanding.
C) The direction of Earth's axis in space precesses with a period of about 26,000 years.
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Friction: A policeman investigating an accident measures the skid marks left by a car on the horizontal road. He determines that the distance between the point that the driver slammed on the brakes (thereby locking the wheels) and the point where the car came to a stop was 28.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes?
A. 10.7 m/s B. 12.8 m/s C. 21.4 m/s D. 32.9 m/s E. 45.7 m/s
When monochromatic light illuminates a grating with 7000 lines per centimeter, its second order maximum is at 62.4°. What is the wavelength of the light?
A) 336 nm B) 752 nm C) 633 nm D) 452 nm E) 363 nm
The density of copper at 293 K is 
and its linear expansion coefficient is
Consider a hot cube of copper that is 1.0cm on a side when its temperature is 1356 K. What is the cube’s mass?
A. 8.80 g B. 8.46 g C. 8.78 g D. 8.38 g E. 8.94 g
Earth behaves as an artificial pulsar, with the strongest pulses for alien observers when North America is either rising or setting
Indicate whether the statement is true or false