The Crab Nebula is a bright, long-lasting supernova remnant that was made by a ________ supernova
Fill in the blank(s) with correct word
type II
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Carbon-14 Dating: A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.144 Bq/g. By comparing this activity with the activity of living organic matter, which is 0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. Carbon-14 has a half-life of 5730 years. If the activity of living matter has been constant over time, how old is the sample of wood?
A. 3870 years B. 4250 years C. 4590 years D. 2630 years E. 2940 years
A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?
a. 42 kN b. 39 kN c. 45 kN d. 48 kN e. 35 kN
How much air must be pushed downward at 60.0 m/s to keep an 800-kg helicopter aloft?
a. 131 kg/s c. 294 kg/s b. 196 kg/s d. 392 kg/s
An astronaut is in an all-metal chamber outside the space station when a solar storm results in the deposit of a large positive charge on the station. Which statement is correct?
a. The astronaut must abandon the chamber immediately to avoid being electrocuted. b. The astronaut will be safe only if she is wearing a spacesuit made of non-conducting materials. c. The astronaut does not need to worry: the charge will remain on the outside surface. d. The astronaut must abandon the chamber if the electric field on the outside surface becomes greater than the breakdown field of air. e. The astronaut must abandon the chamber immediately because the electric field inside the chamber is non-uniform.