A rising parcel of air continues to rise as long as
A) the wind is blowing.
B) it is warmer and less dense than the surrounding air.
C) the temperature is inverted.
D) it is cooler and denser than the surrounding air.
Answer: B
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a. True b. False Indicate whether the statement is true or false
When a vapor condenses, energy is
A) absorbed by the vapor. B) released from the vapor. C) both of these D) neither of these
The quantum mechanical model of the hydrogen atom requires that if the principal quantum number = 6, there will be how many permitted orbital quantum numbers?
a. 3 c. 6 b. 16 d. 5
A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just
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