A 274-N uniform ladder, 11.0 m long, rests against a smooth vertical wall. The coefficient of static friction between ladder and floor is 0.400 . What minimum angle can the ladder make with the floor before it slips?
a. 84.3° b. 68.2°
c. 21.8° d. 51.3°
e. 11.3°
d
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Indicate whether the statement is true or false
Before it ejects a planetary nebula, a star is a
a. red giant. b. black hole. c. white dwarf. d. supernova.
Coulomb's Law: A proton is located at the point (x = 1.0 nm, y = 0.0 nm) and an electron is located at the point (x = 0.0 nm, y = 4.0 nm). Find the magnitude of the electrostatic force that each one exerts on the other. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)
A. 1.4 × 10-11 N B. 5.3 × 10-18 N C. 5.3 × 108 N D. 5.9 × 10-15 N
The spectra of different elements can be distinguished because
a. they have the same spectral lines, but the lines are of different intensities. b. they have spectral lines in different positions. c. every element has one unique spectral line. d. none of the above