The substance that comes from a nuclear reactor which is used to generate power is
A. graphite.
B. radioactive materials.
C. enriched uranium.
D. high-pressure steam.
Answer: D
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The main difference between sand dunes and ripple marks is
A) ripple marks are only caused by water. B) ripple marks are larger than sand dunes. C) sand dunes are larger than ripple marks. D) ripple marks are stationary.
A package is dropped from a helicopter moving upward at If it takes before the package strikes the ground, how high above the ground was the package when it was released if air resistance is negligible?
A) 810 m B) 1000 m C) 1200 m D) 1500 m
The diagrams below show two uniformly charged spheres. The charge on the right sphere is 3 times as large as the charge on the left sphere. Which force diagram best represents the magnitudes and directions of the electric forces on the two spheres?
A particle (q = 5.0 nC, m = 3.0 ?g) moves in a region where the magnetic field has components Bx = 2.0 mT, By = 3.0 mT, and Bz = ?4.0 mT. At an instant when the speed of the particle is 5.0 km/s and the direction of its velocity is 120° relative to the magnetic field, what is the magnitude of the acceleration of the particle?
a. 33 m/s2 b. 17 m/s2 c. 39 m/s2 d. 25 m/s2 e. 45 m/s2