Cepheids and globular clusters are limited in their ability to measure the distance to galaxies because they ____
a. are too rare
b. are not bright enough to detect at large distances
c. behave differently in other galaxies than they do in our own
d. do not appear in dwarf galaxies
e. are only found in elliptical galaxies
b
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A pendulum with a bob of mass 150 g has the same period as a thin rod (not massless) of the same mass and length 17 cm when the rod is pivoted about its end. What is the length of the pendulum?
A. 12 cm B. 15 cm C. 22 cm D. 27 cm
The amount of heat necessary to change the temperature of 1 kg of a substance by 1°C is called the substance's
A. specific heat. B. latent heat. C. heat of combustion. D. mechanical equivalent of heat.
The color of a mineral's powder is called its ______________
Fill in the blank(s) with correct word
The uncertainty in the position of a proton is 250 pm. What is the minimum kinetic energy of the proton when its position has been measured to this precision?
A. 41 MeV B. 83 MeV C. 21 MeV D. 5.2 MeV