Briefly explain why antimatter is difficult to store after it is produced in laboratories
What will be an ideal response?
When matter and antimatter meet, the result is mutual annihilation. Because everything on Earth is made of ordinary matter, it is difficult to prevent antimatter produced in the lab from contacting matter and quickly becoming annihilated.
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The figure shows a cross section of three parallel wires each carrying a current of 20 A. The currents in wires A and B are out of the paper, while that in wire C is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 2.0-m length of wire A?
A. 23 mN B. 64 mN C. 32 mN D. 46 mN E. 55 mN
Country X increases its population by 5% per year. How long will it be before its population doubles?
A) It is impossible to answer this without knowing country X's population. B) 20 years C) 35 years D) 10 years E) 14 years
The place where light is brought into focus (to form an image) in the human eye is called the
A) retina. B) optic nerve. C) lens. D) pupil. E) cornea.
Tidal heating is not important for which of the following Galilean moons?
A) Callisto B) Io C) Europa D) Ganymede