The gravitational field is equivalent to:
a. the inertial mass.
b. an accelerated frame of reference.
c. an event horizon.
d. a clock running slowly.
b
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Graphical Addition: Two vectors, of magnitudes 20 mm and 50 mm, are added together. Which one of the following is a possible value for the magnitude of the resultant?
A. 10 mm B. 20 mm C. 40 mm D. 80 mm
Consider a container of 2.0 g of hydrogen, H2 (one mole). Suppose you removed all the electrons and moved them to the other side of Earth
(Earth's radius is 6380 km, k = 1/4??0 = 9.0 × 109 N ? m2/C2, NA = 6.022 × 1023 molecules/mol, e = 1.60 × 10-19 C) (a) How much charge is left behind after you remove the electrons? (b) What electric force do the protons exert on the electrons after they are separated as described?
A beetle runs an erratic pattern on a square kitchen table that is 1.5 m on a side. The sides are arranged along the directions North/South and East/West. If he begins at the Southwest corner, and travels along one side to the adjacent corner in 20.0 s. He then turns north, and reaches the Northeast corner 12.5 s later. What is the magnitude of his average velocity for the whole trip?
A. 0.092 m/s B. 0.098 m/s C. 0.065 m/s D. 0.033 m/s
Which force holds the quarks together within a proton?
a) Gravity, through exchange of gravitons. b) Proton/neutron mutual attraction forces. c) The 'strong' force, through exchange of gluons. d) Electromagnetic, through exchange of photons. e) The 'weak' force, through nuclear decay.