What is the Great Wall?
A) It is a ridge on the Moon near the crater Birt.
B) It is the distance beyond which astronomers cannot view any more galaxies or even quasars.
C) It is a large sheet of galaxies.
D) It is the time before the universe started expanding, about which we can never know anything.
E) It is an enormous intergalactic cloud of dust and gas that hides more distant galaxies.
C
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Claims that appear to be pseudoscience should be
A. accepted if it is said to have scientific validity B. tested experimentally C. accepted if promoted by news media D. all of the above
A bullet is fired from ground level with a speed of 150 m/s at an angle 30.0° above the horizontal at a location where g = 10.0 m/s2. What is the vertical component of its velocity when it is at the highest point of its trajectory?
A) 0 m/s B) 10 m/s C) 75.0 m/s D) 130 m/s E) 150 m/s
An old bone sample contains 321. grams of carbon and its activity is 947. decays/min. (5730. yr half life of Carbon-14) (a) How many thousand years old is the sample? (b) What will be the activity of the sample 2000. yrs from now?
What will be an ideal response?
When a drag strip vehicle reaches a velocity of 60 m/s, it begins a negative acceleration by releasing a drag chute and applying its brakes. While reducing its velocity back to zero, its acceleration along a straight line path is a constant -6.0 m/s2 . What displacement does it undergo during this deceleration period?
a. 120 m c. 320 m b. 300 m d. 240 m