A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz
After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in the air is 343 m/s.
A) 68 Hz
B) 69 Hz
C) 70 Hz
D) 71 Hz
E) 72 Hz
C
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An object that is 3.4 mm tall is placed 25 cm from the vertex of a convex spherical mirror. The radius of curvature of the mirror has magnitude 73 cm. (a) How far is the image from the vertex of the mirror? (b) What is the height of the image?
What will be an ideal response?
A Carnot refrigerator has a COP of 2.0
(a) What is its efficiency operated as an engine? (b) Operated as an engine, heat is taken in at 500.°C; what is the exhaust Celsius temperature?
The unusual nature of viruses (behaving as living organisms while within them, but becoming inert while isolated) has caused scientists to consider the possibility that:
A) viruses may be considered a kind of life. B) the ability to breathe may need to be added to the definition of life. C) the ability to evolve or mutate should be added to the definition of life. D) the ability to grow should be added to the definition of life. E) the definition of life may be more complex than a simple check list.
Two long, parallel wires carry currents of 20.0 A and 10.0 A in opposite directions (Fig. OQ30.9). Which of the following statements is true? More than one statement may be correct