A high-voltage transmission line of diameter 2 cm and length 150 km carries a steady current of 1 000 A. If the conductor is copper with a free charge density of 8 × 10^28 electrons/m3, how long does it take one electron to travel the full length of the cable? (e = 1.6 × 10^?19 C)
a. 6.0 × 10^2 s
b. 6.0 × 10^4 s
c. 6.0 × 10^6 s
d. 6.0 × 10^8 s
e. 6.0 × 10^–10 s
d
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A 0.30-kg mass is suspended on a spring. In equilibrium the mass stretches the spring 2.0 cm downward. The mass is then pulled an additional distance of 1.0 cm down and released from rest. Write down its equation of motion
A) y = (0.01 m) cos (22.1 t) B) y = (0.01 m) sin (22.1 t) C) y = (0.03 m) cos (22.1 t) D) y = (0.03 m) sin (22.1 t)
Collisions between low density continental plates create the tallest mountain chains, such as the Himalayas
Indicate whether the statement is true or false
The 500-m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500-m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would then be measured to be
A. 180 m. B. 320 m. C. 500 m. D. 625 m. E. 781 m.
The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that ________
A) the planets are always accelerating B) a force is acting on the planets C) the planets will eventually fall into the Sun D) the planets have angular momentum