If you point toward the zenith right now and then point there again 6 hours later, you will have pointed twice in the same direction relative to
a. your horizon.
b. the Sun.
c. the Moon.
d. the fixed stars.
A
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Syrup having density of 1000 kg/m^3 and viscosity of 1250 cP flows through a deep trough at 10 m/s. Determine the Reynolds number at a distance 2 m downstream from the entrance. Is the flow in the boundary layer laminar or turbulent?
What will be an ideal response?
In the Doppler effect it is important to distinguish between
A) frequency and speed. B) speed and velocity. C) speed and acceleration. D) distance and displacement.
A ball thrown upward reaches its maximum height and then falls back. If air resistance is negligible, its acceleration is
A. the same at all points in the motion. B. less on the way up than on the way down. C. the same up and down but zero at the top. D. less on the way down than on the way up.
A 100-kg person sits on a 5-kg bicycle. The force that the person exerts on the bicycle is borne equally by the two wheels of the bicycle. The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 × 105 Pa
What length of each tire is in contact with the ground? A) 1.6 cm B) 1.8 cm C) 3.2 cm D) 2.4 cm E) 6.4 cm