Which of the following is an ion?
A) 2 H2
B) Br2
C) HCl
D) Au + 3 Br2
E) none of the above
Answer: E
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A string with a mass per length of 2.00 gm/m is stretched with a force of 150 N between two points that are 0.500 m apart. The frequency of the second mode of the stretched string is in tune with the fundamental frequency of an organ pipe filled with air and open at both ends. The velocity of sound in air at 0
is 331 m/s. What is the length of the organ pipe?
A. 43.6 cm B. 40.1 cm C. 37.5 cm D. 35.6 cm E. 30.2 cm
When the first law of thermodynamics, Q = ?U + W, is applied to an ideal gas that is taken through an isobaric process,
A) ?U = 0. B) W = 0. C) Q = 0. D) all of the above E) none of the above
The inside of a house is at 20°C on an early morning when the temperature outside is 15°C. The next morning the inside temperature is the same, but the outside temperature is now 5°C. How much does the energy per unit time lost by conduction through the walls, windows, doors, etc., change for the house from the first morning to the second one
a. Since the inside temperature stays the same, the loss is the same both days. b. The loss reduces to 1/3. c. The loss triples. d. The loss increases by 5/278 since we need to use the Kelvin scale for this calculation.
A car is initially traveling west at 25 mph, and makes a turn north. As the car finishes the turn, its velocity is 20 mph north. It takes 3.5 seconds to complete the turn. What is the average acceleration of the car while it is turning, in mph/s? Let east be the positive-x direction and north be the positive-y direction.
a. -7.1i + 5.7j b. 7.1-5.73 c. 571-7.13 d. -5.7i+71.