How do we specify the location of a star in the night sky?
We use two coordinates, altitude or zenith angle, and compass direction.
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A particle (q = 5.0 nC, m = 3.0 ?g) moves in a region where the magnetic field has components Bx = 2.0 mT, By = 3.0 mT, and Bz = ?4.0 mT. At an instant when the speed of the particle is 5.0 km/s and the direction of its velocity is 120° relative to the magnetic field, what is the magnitude of the acceleration of the particle?
A. 33 m/s2 B. 17 m/s2 C. 39 m/s2 D. 25 m/s2 E. 45 m/s2
Leptons can interact by which of the following forces?
A) strong nuclear force, weak nuclear force, electromagnetic force, gravitation B) strong nuclear force, weak nuclear force, electromagnetic force C) weak nuclear force, electromagnetic force, gravitation D) strong nuclear force, weak nuclear force E) strong nuclear force, electromagnetic force, gravitation
When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants
a. 0.500 b. 0.693 c. 0.725 d. 1.33 e. 1.39
Light of wavelength 633 nm from a He-Ne laser passes through a circular aperture and is observed on a screen 4.0 m behind the aperture. The diameter of the central bright area is 5.4 cm. What is the diameter of the aperture?
A) 2.0 ?m B) 960 ?m C) 110 ?m D) 6600 ?m