About how long will a 0.5-Mo star spend on the main sequence?
a. 6 billion years
b. 62 billion years
c. 620 million years
d. 6 million years
e. 600 thousand years
b
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The ratio of the density of a material to the density of water is the __________
Fill in the blank(s) with correct word
A mass spectrometer needs
A) colinear magnetic and electric fields. B) perpendicular magnetic and electric fields. C) only a magnetic field. D) only an electric field. E) a perpendicular gravitational field.
A particle (q = +5.0 ?C) is released from rest when it is 2.0 m from a charged particle which is held at rest. After the positively charged particle has moved 1.0 m toward the fixed particle, it has a kinetic energy of 50 mJ. What is the charge on the fixed particle?
a. ?2.2 ?C b. +6.7 ?C c. ?2.7 ?C d. +8.0 ?C e. ?1.1 ?C
A pipe of length 10.0 m increases in length by 1.5 cm when its temperature is increased by 72°F. What is its coefficient of linear expansion?
a. 38 × 10^?6/°C b. 75 × 10^?6/°C c. 68 × 10^?6/°C d. 28 × 10^?6/°C e. 47 × 10^?6/°C