You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive the frequency as 1470 Hz
You are relieved that he is in pursuit of a different speeder when he continues past you, but now you perceive the frequency as 1400 Hz. What is the frequency of the siren in the police car? The speed of sound in air is 343 m/s.
A)
1300 Hz
B)
1320 Hz
C)
1430 Hz
D)
1360 Hz
E)
1370 Hz
C
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In 20 minutes, Kara ran 2.40 km on a treadmill facing due east. Relative to the gym, what were her displacement and average velocity during this time interval?
a. 0; 0 b. 0; 2.00 m/s c. 2.40 km, east; 0 d. 2.40 km, east; 2.00 m/s, east e. 2.40 km, west; 2.00 m/s, west
Rocks solidified from molten material above ground are classified as ______________ igneous rocks
Fill in the blank(s) with correct word
You stand near the Earth's equator. A positively charged particle that starts moving parallel to the surface of the Earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the
Earth are directed a. upward. b. downward. c. from south to north. d. from north to south. e. from east to west.
When a car is struck by lightning, the resulting electric field inside the car is
A) normally huge, but for a brief time. B) small enough to be safe for a passenger inside. C) zero.