A 0.600-mm diameter wire stretches 0.5% of its length when it is stretched with a tension of 20 N. What is the Young's modulus of this wire?
A) 5.66 × 1010 N/m2
B) 3.54 × 109 N/m2
C) 1.41 × 1010 N/m2
D) 6.43 × 109 N/m2
E) 2.78 × 109 N/m2
C
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According to the nebular theory, how did the asteroid belt form?
A) It is made of planetesimals that formed beyond Neptune's orbit and never accreted to form a planet. B) It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet. C) It consists of objects that fragmented from the protosun during a catastrophic collision early in the formation of the solar system. D) It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets. E) It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula.
Of the following heat engines, which has the highest efficiency?
a. Hero's engine b. a Carnot engine c. a car's gasoline engine d. a truck's diesel engine
The mirrors for X-ray telescopes are the same shape as those of optical reflectors
Indicate whether the statement is true or false
An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
a. 35 m/s b. 25 m/s c. 30 m/s d. 21 m/s e. 17 m/s