The Doppler effect is useful in measuring the ____
a. distance to an object
b. chemical composition of an object
c. temperature of an object
d. motion of an object across the line of sight of an observer
e. motion of an object toward or away from the observer
e
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Gravitational time dilation can be observed in the spectra of atoms on the surface of the Sun
Indicate whether the statement is true or false
The best way to increase the tensile strength of a polycrystalline ceramic is to
(a) Decrease the grain size (b) Add alloy elements (c) Decrease porosity (d) Solution treat, quench, and age
If the Earth were represented as a basketball (˜10 in. in diameter) and the Moon as a baseball (˜3 in. in diameter) then, to order of magnitude, what size would best represent the diameter of the Sun?
a. 10 ft b. 100 ft c. 1000 ft d. 10000 ft
Uniform Circular Motion: When a car goes around a circular curve on a horizontal road at constant speed, what force causes it to follow the circular path?
A. the normal force from the road B. the friction force from the road C. gravity D. No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration.