Calculate the range of the force that might be produced by the virtual exchange of a proton. Assume ?E??t = h/2?. (mp = 1.67 × 10^?27 kg, c = 3.00 × 10^8 m/s, and h/2? = 1.05 × 10^?34 J?s)
a. 6.72 × 10^?25 m
b. 2.10 × 10^?16 m
c. 6.00 × 10^?8 m
d. 1.54 × 10^?15 m
b
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The Herschels' grindstone model of the Milky Way star system was too small because
a. they did not count the brightest stars. b. they did not study the southern sky. c. they did not have large enough telescopes. d. they only observed stars in the disk of the galaxy and not the halo. e. they did not know about interstellar dust clouds.
A ball dropped from the top of a building hits the ground 9.0 s later. How high is the building (in meters)?
The San Andreas fault lies on the boundary of the Pacific plate and the ______________ plate
Fill in the blank(s) with correct word
What is the equivalent resistance between points A and B in the figure when R = 10 ??
a.
20 ?
b.
10 ?
c.
25 ?
d.
15 ?
e.
3.2 ?