A point charge Q is placed on the x axis at x = -2.0 m. A second point charge, -Q, is placed at x = 1.0 m. If Q = 60 mC, what is the magnitude of the electrostatic force on a 40-mC charge placed at the origin?
a. 16 N
b. 27 N
c. 32 N
d. 11 N
e. 3.0 N
B
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A rock is suspended from a scale reads 20.0 N. A beaker of water (having a density of 1000 kg/m3 ) is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?
A) 2.50 × 103 kg/m3 B) 3.00 × 103 kg/m3 C) 1.60 × 103 kg/m3 D) 2.67 × 103 kg/m3 E) 2.33 × 103 kg/m3
How many bonds between nitrogen and hydrogen are formed if you react nitrogen with hydrogen according to the following reaction?
N2 + 3H2 ? 2 NH3 A) 6 B) 2 C) 3 D) 1 E) 8
The expanding Universe theory:
contends that galaxies are moving away from Earth and from each other at fantastic speed. is supported by the fact that all galaxies exhibit a red shift. raises the question of when the expansion began. resulted in the formulation of the big bang theory. All of the above are true.
According to present theories, there is a neutrino for all the following particles except
a. the neutral pion. b. the electron. c. the muon. d. the tau lepton.