A starship navigator measures the distance between the Earth and the sun. If the ship is moving at a speed of 0.90 c, instead of obtaining 93 million miles, the navigator measures a distance (in millions of miles) of
a. 41.
b. 30.
c. 80.
d. 215.
e. 90.
a
Physics & Space Science
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Doppler Effect: Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz signal is returned. If the speed of sound is 345 m/s, how fast is the object moving?
A. 6.9 m/s B. 8.4 m/s C. 331 m/s D. 347 m/s
Physics & Space Science
Four equal resistors connected in series have same current and same voltage across each resistor
Indicate whether the statement is true or false
Physics & Space Science
A 6.0-J pulse of light from a laser has what momentum?
a. Light does not have momentum because it doesn't have mass. b. 3.0 × 10^9 kg·m/s c. 6.7 × 10^–9 kg·m/s d. 2.0 × 10^–8 kg·m/s
Physics & Space Science
Wave 1 has intensity 9.0 units while wave 2 has intensity 4.0 units. What is their ratio of amplitudes,
A1/A2? A. 20 B. 5.1 C. 2.3 D. 1.5 E. 1.3
Physics & Space Science