How many quarks are in a tritium isotope, H?
A) 2
B) 3
C) 4
D) 6
E) 9
E
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What physical feature of Mars is atypical compared with the other terrestrial planets?
A) its size
B) its atmospheric content
C) its surface composition
D) its density
E) its rotation rate
On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did Kepler and Galileo first discover that we live on a planet in solar system
a) December 17 b)September 3 c) 1 second ago
What is the magnitude of the magnetic force on a charged particle (Q = 5.0 ?C) moving with a speed of 80 km/s in the positive x direction at a point where Bx = 5.0 T, By = ?4.0 T, and Bz = 3.0 T?
A. 2.8 N B. 1.6 N C. 1.2 N D. 2.0 N E. 0.4 N
A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the sled and the surface is 0.20, what was the initial speed of the sled?
A) 9.8 m/s B) 6.3 m/s C) 3.6 m/s D) 7.2 m/s E) 8.9 m/s