The pressure differential across a wing cross section due to the difference in air flow is explained by
A) Newton's third law.
B) Bernoulli's equation.
C) Poiseuille's law.
D) Archimedes Principle.
E) Kepler's law.
B
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Mass on a Spring: An object attached to an ideal spring executes simple harmonic motion. If you want to double its total energy, you could
A. double the amplitude of vibration. B. double the force constant (spring constant) of the spring. C. double both the amplitude and force constant (spring constant). D. double the mass. E. double both the mass and amplitude of vibration.
You can get a sunburn while under the "shade" of a beach umbrella due to
A) reflected sunlight from the sand. B) refracted sunlight from the water. C) light scattering in the air. D) none of the above
Isaac Newton's contributions to physics include
a. the laws of motion. b. the law of universal gravitation. c. invention of the calculus. d. the invention of the reflecting telescope. e. all of the above.
The figure shows a cross section of three parallel wires each carrying a current of 15 A. The currents in wires A and C are out of the paper, while that in wire B is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 4.0-m length of wire C?
a.
90 mN
b.
54 mN
c.
30 mN
d.
18 mN
e.
36 mN