A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale. Assume there is no frictional force between the bottom of the scale and the hill. The static friction force the scale exerts on the person is
a. 0 N.
b. 201 N.
c. 211 N.
d. 553 N.
e. 580 N.
a
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Which of these does Earth's Moon NOT have because of its weaker gravity/smaller mass than Earth?
a. thick atmosphere b. liquid water oceans c. solid surface d. thick atmosphere and liquid water oceans e. liquid water oceans and solid surface
Each pattern shown below would appear on a screen when monochromatic light first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case is the slit illuminated with light of the longest wavelength?
a.
b.
c.
Three resistors with values R1, R2, and R3, respectively, are connected in parallel. Which of the following expresses the total resistance, RT, of the three resistors when connected in parallel?
a. RT = (1/R1 + 1/R2 + 1/R3) c. RT = R1 + R2 + R3 b. RT = R1 = R2 = R3 d. RT = (1/R1 + 1/R2 + 1/R3)-1
On the moon, the maria are younger than the highlands
Indicate whether the statement is true or false