What is the distance traveled by a beam of light in a time of 2.0 ms?
A) 6.0 × 105 m
B) 0.66 × 105 m
C) 90 m
D) 70 m
E) 60 m
A
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From the center outward, the correct order is:
A) liquid iron inner core, solid nickel outer core, rocky mantle, silicate crust. B) solid metallic inner core, molten metal outer core, silicate mantle and crust. C) solid metal core, molten metal hydrosphere, rocky lithosphere, gases in atmosphere. D) solid rock core, liquid metal mantle, solid rock crust. E) molten metal hydrosphere, molten rock lithosphere, solid silicate crust.
Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the force on any one of the charges is
?
?
A. 1.88 × 10?2. B. 3.25 × 10?2. C. 3.73 × 10?2. D. 6.50 × 10?2. E. 7.50 × 10?2.
If the accretion disk around a black hole emits X-rays outside the event horizon, the X-rays can escape
Indicate whether the statement is true or false
An old bone sample contains 321 g of carbon and has an activity of 947 decays/min due to the carbon-14 in it. The half-life of carbon-14 is 5730 y
Assume that the activity of the atmospheric carbon is, and has remained, 0.255 Bq per gram of carbon. (a) How old is the sample? (b) What will be the activity of the sample 2000 y from now, in decays per minute?