A student slides her 80.0-kg desk across the level floor of her dormitory room a distance 4.00 m at constant speed. If the coefficient of kinetic friction between the desk and the floor is 0.400, how much work did she do?
A) 128 J
B) 3.14 kJ
C) 26.7 J
D) 1.26 kJ
E) 24.0 J
D
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In units of yards, how far from the Big Bang is the Recombination period, when the gas becomes transparent to light?
a. much, much less than a yard b. about a yard c. about 5 yards d. about 10 yards
In a double-slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 150 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point P when the angular distance of P is 10° relative to the central peak, and the wavelength is 500 nm? (Convert your result so the angle is between 0 and 360°.)
A. 145° B. 155° C. 165° D. 135° E. 95°
The water hole lies between 18 and 21 cm in wavelength in the radio spectrum
Indicate whether the statement is true or false
In addition to the proper chemistry, it is ________ that determines the feasibility of life on a given planet
Fill in the blank(s) with correct word