A charged particle (m = 5.0 g, q = ?70 ?C) moves horizontally at a constant speed of 30 km/s in a region where the free fall gravitational acceleration is 9.8 m/s2 downward, the electric field is 700 N/C upward, and the magnetic field is perpendicular to the velocity of the particle. What is the magnitude of the magnetic field in this region?
a. 47 mT
b. zero
c. 23 mT
d. 35 mT
e. 12 mT
a
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Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 106 N/C
(a) What is the charge per unit area on each plate? (b) If the plates are now moved two times farther apart, what is the electric field between the plates?
At least 50 percent of the stars in the Orion nebula are encircled by dense disks of gas and dust with more than enough mass to make planetary systems like ours
Indicate whether the statement is true or false
At the Sun Dagger in New Mexico, a dagger-shaped beam of sunlight pierces a spiral
A) every day at noon. B) at noon on the summer solstice. C) at sunset on the spring equinox. D) at noon on the day of full Moon each month. E) during the totality of a total solar eclipse.
A vessel containing 5.0 kg of water at 10°C is put into a refrigerator. The 1/7 HP motor (1 HP = 746 W) runs for 5.0 minutes to cool the liquid to the refrigerator's low temperature, 0°C. What is the COP of the refrigerator?
a. 5.7 b. 4.6 c. 6.5 d. 7.2 e. 3.6