A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. What is the acceleration of the crate if the 750-N force is maintained after the crate begins to move and the coefficient of kinetic friction is 0.16?
a. 1.8 m/s2
c. 3.0 m/s2
b. 1.4 m/s2
d. 2.1 m/s2
B
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The electric field in a given location points along the –x axis. This means that
A. At that location, the potential is positive B. At that location, the potential decreases as one moves toward negative values of x. C. At that location, the potential decreases as one moves toward positive values of x. D. At that location, the potential is negative
A hole is poked through the metal side of a drum holding water. The hole is 28 cm below the water surface. What is the initial speed of outflow?
a. 1.9 m/s c. 3.2 m/s b. 2.3 m/s d. 3.5 m/s
There are more giant elliptical than dwarf galaxies
Indicate whether the statement is true or false
Titan is an interesting moon because:
A) beneath its clouds, Titan may be Earth-like, with liquid water. B) the Huygens rover has sent back images of sedimentary rocks there. C) it has a rich atmosphere that may resemble that of the early Earth. D) it is known to have ice volcanism on its surface. E) All of the above.