You are moving past the Earth at 0.99c and notice your heart beating 88. times/minute

(a) Your doctor on Earth observes your heart rate to be what?
(b) If you had been moving 99.99% the speed of light, you would have observed your heart to be beating how fast?


(a) 12. beats/min
(b) 88. beats/min

Physics & Space Science

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Gravitational lensing is the process by which

A) a massive object magnifies and distorts the light from an object behind it B) the wavelengths of light from a star are shifted as it moves about its center of mass C) a planet passes in front of its parent star and blocks part of its light D) a massive object accelerates another object that passes close to it

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Velocity Addition: Two spaceships approach Earth from the same direction. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?

A. 0.13c B. 0.14c C. 0.15c D. 0.16c E. 0.18c

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Electric Field of Point-Charges: Three equal-magnitude point charges of varying signs are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the vacant corner of the square?

A. A B. B C. C D. D

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As a general rule, there is a(n) __________ relationship between increased stream order and stream size

What will be an ideal response?

Physics & Space Science