The central star of the Crab Nebula has now collapsed into a(n) ________, whose energy keeps this famous nebula visible even in binoculars
Fill in the blank(s) with correct word
pulsar
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The ozone layer is our friend because
A) it protects us from damaging ultraviolet radiation. B) it protects us from damaging infrared radiation. C) of the role it plays in keeping Earth warm. D) its electrical properties help to bend radio waves around the earth. E) it protects the earth from undergoing a harmful greenhouse effect.
A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K
If the emissivity of the plate is 0.75, at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. (? = 5.67 × 10-8 W/m2 ? K4 ) A) 850 W B) 790 W C) 760 W D) 880 W E) 360 W
What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?
a. 9.9 mm b. 1.1 cm c. 1.3 cm d. 1.4 cm e. 7.6 mm
A charge per unit length given by l(x) = bx, where b = 12 nC/m2, is distributed along the x axis from x = +9.0 cm to x = +16 cm. If the electric potential at infinity is taken to be zero, what is the electric potential at the point P on the y axis at y = 12 cm?
a. 5.4 V b. 7.2 V c. 9.0 V d. 9.9 V e. 16 V