Evidence that the cosmic background radiation is the remnant of a Big Bang comes from predicting characteristics of remnant radiation from the Big Bang theory and comparing these predictions with observations
Four of the five statements below are real. Which one is fictitious?
A) The cosmic background radiation is expected to have a temperature just a few degrees above absolute zero, and its actual temperature turns out to be 2.73 K.
B) The cosmic background radiation is expected to have tiny temperature fluctuations at the level of about 1 part in 100,000. Such fluctuations were found in the COBE data.
C) The cosmic background radiation is expected to look essentially the same in all directions, and it does.
D) The cosmic background radiation is expected to contain redshifted emission lines from hydrogen and helium, and it does.
E) The cosmic background radiation is expected to have a perfect thermal spectrum, and observations from the COBE spacecraft verify this prediction.
D
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The number of protons in the nucleus determines which element it is
a. True b. False Indicate whether the statement is true or false
When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
a. is independent of velocity or acceleration. b. increases when the velocity increases. c. is proportional to the acceleration. d. decreases when the force parallel to the floor increases. e. increases when the force parallel to the floor increases.
Three forces act on the object in the sketch. In what direction will the object move?
A. To the left B. To the right C. To the left and up D. Upward E. To the right and up
A load is being lifted vertically upwards by means of two cables attached to it. The first cable exerts a force of 600 N at an angle of 35.0° to the left of the vertical. The second cable exerts a force of 1300 N
At what angle to the right of the vertical is the second cable pulling? A) 15.4° B) 16.2° C) 30.8° D) 67.8° E) 75.8°