A bow is drawn so that it has 40 J of potential energy. When the arrow is fired its kinetic energy is ideally
A) less than 40 J.
B) more than 40 J.
C) 40 J.
Answer: C
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The supermassive black hole at the center of the galaxy is:
A.) 15 light-years away. B.) 300 light-years away. C.) 8,800 light-years away. D.) 26,000 light-years away. E.) 90,000 light-years away.
Jupiter's magnetic field is the result of ________.
A. huge storms in its upper atmosphere generating lightning B. an aurora in its upper atmosphere C. the alternating wind directions in its atmosphere D. its rapid rotation and convective interior E. the large amount of iron present in its interior
A hydraulic jack has a mechanical advantage allowing a puny human to lift a car. Which of the following statements is true?
A. the input force is equal to the output force B. the area of the input piston is equal to the area of the output piston C. the distances the input and output pistons move are equal D. the work done by the output piston is equal to the work done on the input piston
The resistance of a platinum wire is to be calibrated for low-temperature work. A platinum wire with resistance 2.000 W at 20°C is immersed in liquid nitrogen at 77 K (-196°C). If the temperature response of the platinum wire is linear, what is the expected resistance of the platinum wire at -196°C? [aplatinum = 3.92 × 10^-3 (°C)-1]
a. 0.153 W c. 3.69 W b. 1.768 W d. 0.307 W