What is the unit of electric current?
a. The volt.
b. The joule.
c. The coulomb.
d. The ampere.
e. The watt.
d
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The speed of a particle moving in a circle 2.0 m in radius increases at the constant rate of 4.4 m/s2 . At an instant when the magnitude of the total acceleration is 6.0 m/s2, what is the speed of the particle?
a. 3.9 m/s b. 2.9 m/s c. 3.5 m/s d. 3.0 m/s e. 1.4 m/s
Briefly describe how astronomers estimate the number of galaxies in the observable universe.
Fill in the blank(s) with the appropriate word(s).
Which of the following stars is the hottest?
A) a blue star B) an orange star C) a yellow star D) a green star E) a red star
The lithosphere consists of
a. all of the crust's depth. b. all of the crust's depth and part of the mantle's depth. c. part of the crust's depth. d. all of the crust's depth and all of the mantle's depth.