A straight wire of length 70 cm carries a current of 50 A and makes an angle of 60° with a uniform magnetic field. If the force on the wire is 1.0 N what is the magnitude of B?
a. 41 mT
b. 33 mT
c. 55 mT
d. 87 mT
e. 57 mT
b
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Velocity: Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. How long does it take for them to meet?
Fill in the blank(s) with the appropriate word(s).
How do we know that pulsars must be very small in size (radius)?
A) We have measured their radii directly in high-resolution telescope images. B) Their small sizes are inferred from careful study of their spectra. C) Some spin so rapidly that if they were larger in size, their surfaces would be moving faster than the speed of light. D) Only very small objects can beam radiation into space. E) This is only a theory that has not yet been confirmed by observations.
One hypothesis suggested to explain the uniform age of the surface of Venus is that
a. Venus's surface is 4 billion years old and has not been affected by flooding or slow evolution. b. Venus's surface is made of rocks that are much harder than Earth's and thus last longer. c. Venus periodically goes through a catastrophic melting of its entire surface. d. Venus's clouds protect it from meteorites so that very few impacts occur to change its surface. e. dust storms deposit large amount of dust on the surface, making it appear of uniform age.
Why does the Moon have a layer of "powdery soil" on its surface?
A) It is the result of countless tiny impacts by small particles striking the Moon. B) Recent, large impacts shattered lunar rock to make this soil. C) It is made by the same processes that make powdery sand on Earth. D) It exists because the Moon accreted from powdery material after a giant impact blasted the Earth.