A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is
a. 0
b. 5 m/s2.
c. 9.8 m/s2.
d. 10 m/s2.
e. 20 m/s2.
d
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What change slowly occurs during the main-sequence lifetime of a star?
A) As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity. B) It gathers more gas from interstellar space, increasing its mass and hence the luminosity. C) Its core temperature slowly increases, increasing the fusion rate and hence the luminosity. D) As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity.
A rectangular coil (0.20 m × 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N ? m. What is the current in the coil?
A. 5.0 mA B. 1.7 A C. 8.3 mA D. 1.0 A E. 42 mA
The daily spin of Earth on its axis is called ________.
A. constellation B. rotation C. revolution D. precession E. annualization
When you hold one end of a solid rod in a fire, the other end becomes hot because of heat convection
a. True b. False Indicate whether the statement is true or false