Carbon has a negative temperature coefficient of resistance of –0.5 × 10^–3 (°C)-1 . What temperature increase would result in a resistance decrease of 3% for a carbon resistor?
a. 60°C
c. 20°C
b. 100°C
d. 40°C
A
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Gravity obeys an inverse square relation. This statement implies that the force due to gravity between two masses
a. will increase as the distance between the two masses increases. b. will decrease as the square of the distance between the two masses increases. c. will cause the two masses to move away from each other. d. will cause the two masses to move in a straight line. e. will cause the two masses to orbit each other.
If a virtual image is formed along the principal axis 15 cm from a concave mirror with the focal length 15 cm, what is the object distance from the mirror?
a. 6.0 cm c. 30 cm b. 10 cm d. 7.5 cm
In a head-on automobile collision, a person's momentum could be reduced from 2000 kg m/s to zero in just 0.1 s. If this occurs, the average force exerted to stop the person is
A. 2,000 N. B. 20,000 N. C. 200 N. D. This can't be answered without knowing the person's mass
Far-ultraviolet rays have short wavelengths, low energies, and travel at the speed of sound
a. True b. False Indicate whether the statement is true or false