A 200-N block, on a 30° incline, is being held motionless by friction. The coefficient of static friction between the block and the plane is 0.60 . The force due to friction is:
a. 104 N.
c. 60 N.
b. 100 N.
d. 0 N.
B
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Indirect detection of an extrasolar planet means ________
A) seeing the planet with the naked eye B) sending a space probe to the planet C) acquiring images or spectra of the planet D) observing the planet's effect on its host star
Graphical Addition: Vectors 
and 
obey the equation 
+ 
= 0. These vectors satisfy which one of the following statements?
A. Vectors 
and 
are at right angles to each other.
B. Vectors 
and 
point in the same direction.
C. Vectors 
and 
have the same magnitudes.
D. The magnitude of 
is the negative of the magnitude of 
.
The Hubble time is expressed as
A) H × D. B) D/v. C) 1/H. D) H × T. E) the critical density/H.
Mass on a Spring: An object that hangs from the ceiling of a stationary elevator by an ideal spring oscillates with a period T. If the elevator accelerates upward with acceleration 2g, what will be the period of oscillation of the object?
A. 4T B. 2T C. T D. T/2 E. T/4