Samantha pushes a 60-N crate up a ramp 30 m in length and inclined at 10° with the horizontal. What potential energy change does the crate experience?
a. 1.8E+3 J
b. 1.8E+3 J
c. 1.2E+1 J
d. 3.1E+2 J
e. 1.0E+4 J
d
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A 120 N picture hangs from a nail in the wall. The maximum shear stress the nail can sustain is 1.00 
The smallest diameter the nail can be is
A. 10.5 mm. B. 12.4 mm. C. 13.7 mm. D. 14.4 mm. E. 15.9 mm.
RC Circuits: A fully charged 37-µF capacitor is discharged through a 1.0-k? resistor. If the voltage across the capacitor is reduced to 7.6 volts after just 20 ms, what was the original potential across the capacitor?
A. 16 V B. 13 V C. 11 V D. 9.0 V E. 8.0 V
Light of wavelength 500 nm illuminates a round 0.50-mm diameter hole. A screen is placed 6.3 m behind the slit. What is the diameter of the central bright area on the screen?
A) 15 mm B) 270 ?m C) 7.7 mm D) 3800 ?m
Consider a main-sequence star, a white dwarf, a neutron star, and the singularity of a black hole. Which of the following lists them in the correct order of increasing density (low to high)?
A) main sequence star, white dwarf, neutron star, black hole singularity B) main sequence star, neutron star, white dwarf, black hole singularity C) black hole singularity, main sequence star, white dwarf, neutron star D) main sequence star, black hole singularity, neutron star, white dwarf