Energy Levels: The energy difference between adjacent orbit radii in a hydrogen atom
A. increases with increasing values of n.
B. decreases with increasing values of n.
C. remains constant for all values of n.
D. varies randomly with increasing values of n.
Answer: B
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Thin Lenses: How far from a converging lens of focal length 30 cm must an object be placed so the image will be virtual and 3.0 times as large as the object?
Fill in the blank(s) with the appropriate word(s).
Atmospheric air at 10°C enters a 2 m long smooth rectangular duct with a 7.5 cm x 15 cm cross-section. The mass flow rate of the air is 0.1 kg/s. If the sides are at 150°C, estimate (a) the heat transfer coefficient, (b) the air outlet temperature, (c) the rate of heat transfer, and (d) the pressure drop.
GIVEN
FIND
ASSUMPTIONS
Steady state
The duct is smooth
SKETCH
A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.70 m long and each ball on the end is 0.10 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis through the center perpendicular to both rods?
a. 7.0E–3 kg·m2 b. 2.5E–2 kg·m2 c. 1.2E–2 kg·m2 d. 4.9E–2 kg·m2 e. 7.0E–2 kg·m2
A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct?
A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration points downward.