Whereas loudness is a physiological sensation, sound intensity is
A) the same.
B) measurable with acoustical instruments.
C) both of these
D) neither of these
Answer: B
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A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. ?0.64 kJ b. ?0.40 kJ c. ?0.52 kJ d. ?0.28 kJ e. ?0.76 kJ
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the sun respectively. The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is
a. 0.25. b. 0.50. c. 1.0. d. 2.0. e. 4.0.
Mutual Inductance: The mutual inductance between two coils is 10 mH. The current in the first coil changes uniformly from 2.7 A to 5.0 A in 160 ms. If the second coil has a resistance of 0.60 ?, what is the magnitude of the induced current in the second coil?
Fill in the blank(s) with the appropriate word(s).
The potential energy of a spring is 0.25 J when it is compressed 0.04 m to the left of its equilibrium position. This is its leftmost position. What is its kinetic energy when it returns to the equilibrium point?
A. zero B. -0.3 J and moving to the left C. 0.3 J and moving to the right D. 0.3 J and at rest