A wheel rotating about a fixed axis has an angular position given by ? = 3.0 ? 2.0t3, where ? is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2.0 s?
A. ?1.0 rad/s2
B. ?24 rad/s2
C. ?2.0 rad/s2
D. ?4.0 rad/s2
E. ?3.5 rad/s2
Answer: B
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a. A, K b. M, F c. B, O d. L, G
The sun has a radius of 7 × 108 m and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.
GIVEN • The sun approximates a blackbody • Surface temperature (Ts) = 5800 K • Radius (r) = 7 × 108 m FIND (a) The total rate of radiation from the sun (qr) (b) The radiation flux per square meter of surface area (qr/A) PROPERTIES AND CONSTANTS he Stefan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
The two types of reflection are ______________ and ___________
Fill in the blank(s) with correct word
The electric field at point P due to a point charge Q a distance R away from P has magnitude E. In order to double the magnitude of the field at P, you could
A) double the distance to 2R. B) double the charge to 2Q. C) reduce the distance to R/2. D) reduce the distance to R/4. E) double the charge to 2Q and at the same time reduce the distance to R/2.