A steel wire in a piano has a length of 0.700 m and a mass of 4.30 grams. To what tension must this wire be stretched to make the fundamental frequency correspond to middle C, (fc = 261.6 Hz)?
824 N
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A 40.0-kg suitcase is being pulled along the ground by means of a strap which exerts a force of 10.0 N at an angle of 43.0° above the horizontal. What is the normal force exerted by the ground?
A) 17.1 N B) 15.7 N C) 385 N D) 272 N E) 398 N
In a thermally insulated kitchen, an ordinary refrigerator is turned on and its door is left open. The temperature of the room:
A. remains constant according to the first law of thermodynamics B. increases according to the first law of thermodynamics C. decreases according to the first law of thermodynamics D. remains constant according to the second law of thermodynamics E. increases according to the second law of thermodynamics
Once black holes become dormant, they cannot become active galactic nuclei (AGN) again
Indicate whether the statement is true or false
A typical protostar may be several thousand times more luminous than the Sun. What is the source of this energy?
A) Chemical combustion of hydrocarbons B) Nuclear fusion in its core C) From the release of gravitational energy as the protostar continues to shrink D) The ionization of the gas as it heats up E) From nearby hot stars or supernovae that have initiated the star formation process