The Hubble Law is a relation between a galaxy's
a. mass and its luminosity.
b. distance and its luminosity.
c. mass and its recession velocity.
d. distance and its recession velocity.
e. mass and its diameter.
D
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Two particles, each having a mass of 3.0 ?g and having equal but opposite charges of magnitude 5.0 nC, are released simultaneously from rest when the two are 5.0 cm apart. What is the speed of either particle at the instant when the two are separated by 2.0 cm?
A. 2.1 m/s B. 1.5 m/s C. 1.8 m/s D. 2.4 m/s E. 3.2 m/s
How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
a. 0.22 kJ b. 0.20 kJ c. 0.24 kJ d. 0.27 kJ e. 0.31 kJ
To increase the temperature of 50 grams of water by 2 Celsius degrees requires
A) 0.04 calorie. B) 2 calories. C) 4.19 calories. D) 25 calories. E) 100 calories.
A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline?
a. the hoop b. the solid sphere c. the spherical shell d. the cylinder e. They all go the same distance up their inclines.