Theoretical physicists have had the greatest success in combining which force with the electromagnetic force?
a. strong nuclear force
b. weak nuclear force
c. gravitational force
d. the force caused by the exchange of gluons
b
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Some people wish that we lived in a recollapsing universe that would eventually stop expanding and start contracting. For this to be the case, which of the following would have to be true (based on current understanding)?
A) Dark energy is the dominant form of energy in the cosmos. B) Dark energy does not exist and there is much more dark matter than we are aware of to date. C) Neither dark energy nor dark matter really exist. D) Dark energy exists but dark matter does not.
A magnifying lens with a focal length of 30 cm has what magnification when the viewing eye is relaxed?
a. 7.14 b. 0.8 c. 1.3 d. 1.8 e. –0.2
A 25-?F capacitor charged to 50 V and a capacitor C charged to 20 V are connected to each other, with the two positive plates connected and the two negative plates connected. The final potential difference across the 25-?F capacitor is 36 V. What is the value of the capacitance of C?
a. 43 ?F b. 29 ?F c. 22 ?F d. 58 ?F e. 63 ?F
A satellite of mass m has an orbital period T when it is in a circular orbit of radius R around the earth. If the satellite instead had mass 4m, its orbital period would be
A) 4T. B) 2T. C) T. D) T/2. E) T/4.