Which of the following is a megawatt?

A) 109W
B) 106W
C) 1000 W
D) 10-9W
E) 10-6W


B

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science