The howler monkey is the loudest land animal and can be heard up to a distance of 2.5 km. Assume the acoustic output of a howler to be uniform in all directions. The acoustic power emitted by the howler, in mW, is closest to:
A) 0.079
B) 0.026
C) 0.26
D) 0.79
E) 2.6
A
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Energy and Momentum: If you want to double the kinetic energy of a gas molecule, by what factor must you increase its momentum?
A. 
B. 2
C. 2
D. 4
E. 16
Which of the following statements about thermal radiation is always true?
A) A hot object emits more radiation per unit surface area than a cool object. B) A cold object produces more total infrared and radio emission per unit surface area than a hot object. C) A hot object produces more total infrared emission than a cooler object. D) All the light emitted by hot object has higher energy than the light emitted by a cooler object.
A 2.0-kg block slides on a rough horizontal surface. A force (magnitude P = 4.0 N) acting parallel to the surface is applied to the block. The magnitude of the block's acceleration is 1.2 m/s2 . If P is increased to 5.0 N, determine the magnitude of the block's acceleration
a. 2.1 m/s2 b. 2.3 m/s2 c. 1.9 m/s2 d. 1.7 m/s2 e. 3.2 m/s2
When a single slit that is 0.050 mm wide is illuminated by light of 550-nm wavelength, what is the angular separation between the first two minima on one side of the central maximum?
A) 0.36° B) 0.47° C) 0.54° D) 0.63° E) 1.3°