You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed and you perceive the frequency as
You are relieved that he is in pursuit of a different driver when he continues past you, but now you perceive the frequency as What is the speed of the police car? The speed of sound in air is
A) 40.1 m/s B) 41.7 m/s C) 39.2 m/s D) 30 m/s E) 38.4 m/s
A
You might also like to view...
When is/was gravitational contraction an important energy generation mechanism for the Sun?
A) It was important when the Sun was forming from a shrinking interstellar cloud of gas. B) It is the primary energy generation mechanism in the Sun today. C) It has played a role throughout the Sun's history, but it was most important right after nuclear fusion began in the Sun's core. D) It is important during periods when the Sun is going from solar maximum to solar minimum.
The rest energy of a particular subatomic particle is 1200 MeV. If this particle is traveling at 90% the speed of light, what is its total relativistic energy?
A 420-turn circular coil with an area of 0.0650 m2 is mounted on a rotating frame, which turns at a rate of 22.3 rad/s in the presence of a 0.0550-T uniform magnetic field that is perpendicular to the axis of rotation. What is the instantaneous emf in the coil at the moment that the normal to its plane is perpendicular to the field?
a. 33.5 V b. zero c. 0.0673 V d. 747 V e. 1.50 V
If the theoretical efficiency of a Carnot engine is to be 100%, the heat sink must be
A) at absolute zero. B) at 0°C. C) at 100°C. D) at 1000°C. E) infinitely hot.