Which of these errors are random? a. trial time is recorded with a watch that is a half second off each minute. b. the door to a dark room is opened while an x-ray is being developed. c. a balance was not zeroed before being used to measure the mass of an object. d. a student misreads the temperature on a thermometer. e. the use of a cell phone interferes with the radio frequency of an electronic device. check all that apply.

B. The door to a dark room is opened while an X-ray is being developed.

E. The use of a cell phone interferes with the radio frequency of an electronic device.

Explanation:

Correct on e2020.

a) 0.94 C

b) 7.14 m

c) 3.11 m

d) 1.40 s

e) 2.93 s

Explanation:

First we need to set up a coordinate system. This will have the positive X axis pointing north. So spaceship A has positive speed, and spaceship B has negative speed.

The Lorentz transformation for speed is:

u: speed of spaceship A as observed by you

v: speed of spaceship B as observed by you

In the case of the speed of spaceship A as observed by spaceship B:

The transform for lengths is:

For the case of spaceship A as observed by you:

For the case of spaceship A as observed by spaceship B:

The time dilation equation is:

For the case of the event as observed by you:

For the case of the event as observed by spaceship B: