A particle (q = ?4.0 ?C, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2 . What is the magnitude of the magnetic field?
a. 5.3 mT
b. 4.9 mT
c. 5.1 mT
d. 4.7 mT
e. 3.6 mT
d
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Which of the following is NOT a property of the outer planets?
A. They are composed mostly of hydrogen and helium. B. They all have solid surfaces for spacecraft to land on. C. They are all far more massive than Earth. D. They all have rings.
Match the words at the left to the correct blanks in the sentences at right. Use each choice only once.
A. Spacecraft images show fountains of ice spraying into space from Saturn's moon _________ B. Jupiter has three moons for which there is evidence of a global, subsurface ocean of liquid water, with the strongest evidence favoring an ocean on _________ C. ______ is the most volcanically active world in the solar system. D. Scientists have detected lakes of liquid methane and ethane on the surface of __________ E. The two moons that are larger than the planet Mercury are Titan and __________, which is also the largest of Jupiter's moons (and largest moon in the solar system).
A parallel-plate capacitor consists of two parallel, square plates that have dimensions 1.0 cm by 1.0 cm
If the plates are separated by 1.0 mm, and the space between them is filled with teflon, what is the capacitance of this capacitor? (The dielectric constant for teflon is 2.1, and ?0 = 8.85 × 10-12 C2/N ? m2.) A) 1.9 pF B) 0.44 pF C) 2.1 pF D) 0.89 pF
A 2.0-kg block slides on a frictionless 25° inclined plane. A force of 4.6 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
a. 1.8 m/s2 up the incline b. 2.3 m/s2 up the incline c. 6.6 m/s2 down the incline d. 1.8 m/s2 down the incline e. 2.3 m/s2 down the incline