Which of the following is a megawatt?
A) 109W
B) 106W
C) 1000 W
D) 10-9W
E) 10-6W
B
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A copper cable needs to carry a current of 160 A with a power loss of only 2.0 W/m. What is the required radius of the copper cable? (The resistivity of copper is 1.7 × 10^?8 ??m)
a. 0.43 cm b. 0.83 cm c. 1.7 cm d. 2.6 cm e. 0.33 cm
Mutual gravitation is ____
a. a type of force that acts on an object moving at constant speed b. the acceleration of an object in the absence of a force c. a property of all matter in the universe d. the limit of gravitational force from one object to another e. a type of force that repels surrounding particles
Light with wavelength 5.6 × 10^–7 is used to determine the position of an electron to within the wavelength of the light. What is the resulting uncertainty in the electron's velocity? h = 6.63 × 10^–34 J?s, me = 9.11 × 10^–31 kg
a. 1300 m/s b. 103 m/s c. 207 m/s d. 16,331 m/s
Spherical Mirrors: An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm. If the object is 4.0 cm tall, how tall is the image?
A. 1.0 cm B. 2.0 cm C. 8.0 cm D. 16 cm