A box is to be moved across a level surface. A force of magnitude 200 N may be applied at an angle of 30° below the horizontal to push the box or at an angle of 30° above the horizontal to pull the box, either application sufficient to overcome friction and move the box. Which application will cause the box to have the greater acceleration?
a. the one below the horizontal
b. the one above the horizontal
c. both give equal acceleration
d. more information is needed
b
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According to the law of reflection, a light ray striking a mirror at an angle of incidence of 30 degrees will leaves the mirror at an angle of
a. 60 degrees. b. 30 degrees. c. less than 30 degrees. d. none of the above.
Mercury's surface most resembles that of which other body?
A) Earth B) Moon C) Venus D) Mars E) Io
A wave is represented by the equation y(x, t) = 3.2 cm sin(1000 rad/s t - 50
x). Another wave is represented by the equation y(x, t) = 4.2cm sin(1000 rad/s t - 50
x). If the two waves interfere constructively, then what is equation that represents the coherent superposition of the two waves?
A. y(x, t) = 7.4 cm sin(1000 rad/s t + 50.0
x)
B. y(x, t) = 1.0 cm sin(1000 rad/s t - 50.0x)
C. y(x, t) = 1.0 cm sin(1000 rad/s t + 50.0x)
D. y(x, t) = 7.4 cm sin(1000 rad/s t - 50.0x)
Which is smaller?
A) a local group B) a local supercluster