Calculate (0.83 + 0.049)(4.4 × 10^3), keeping only significant figures
a. 3 900
b. 3 868
c. 3 886
d. 3 644
e. 4 000
a
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The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10-18 W. How many photons arrive each second?
(c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It hits the ground in 2.0 s. How high is the building?
A. 70 m B. 50 m C. 30 m D. 20 m
The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 5.0 kg, F = 14 N and ? = 35°, what is the coefficient of kinetic friction between the block and the horizontal surface?
a.
0.44
b.
0.33
c.
0.38
d.
0.28
e.
0.17
Compared to the spirals, elliptical galaxies tend to be more dusty
Indicate whether the statement is true or false