Two adjacent sources each emit a frequency of 800. Hz in air where the velocity of sound is 340. m/s. How much farther back would the first source have to be moved so an observer in front of the sources would hear no sound?
What will be an ideal response?
0.213 m
Physics & Space Science
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How much heat (in kcal) must be removed to make ice at ?10°C from 2 kg of water at 20°C? (The specific heat of ice is 0.50 cal/g?°C.)
A. 190 B. 200 C. 240 D. 210 E. 50
Physics & Space Science
Describe one of the future planned space missions to search for extrasolar planets. How will it improve on current observations?
What will be an ideal response?
Physics & Space Science
The number of protons in a nucleus is the __________ number
Fill in the blank(s) with correct word
Physics & Space Science
An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the circuit can accommodate 15 A of current. How many heaters can be safely operated in the circuit?
A) 2 B) 3 C) 4 D) 5 E) more than 5
Physics & Space Science