A 10 kg bomb is moving NORTH with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0 kg fragment moving WEST with a speed of 8.0 m/s, a 4.0 kg fragment moving EAST with a speed of 10 m/s, and a third 1.0 kg fragment. What is the velocity of the third fragment?
A. zero
B. 40 m/s NORTH
C. 40 m/s SOUTH
D. none of these answers are correct
B. 40 m/s NORTH
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Which event marks the beginning of a supernova?
A) the expansion of a low-mass star into a red giant B) the beginning of neon burning in an extremely massive star C) the onset of helium burning after a helium flash in a star with mass comparable to that of the Sun D) the sudden collapse of an iron core into a compact ball of neutrons E) the sudden outpouring of X-rays from a newly formed accretion disk
The energy from the accretion disk around a black hole would show gravitational red shift due to its immense gravity and tidal distortion of space there
Indicate whether the statement is true or false
A very large sheet of a conductor carries a uniform charge density of 4.00 pC/mm2 on its surfaces. What is the electric field strength 3.00 mm outside the surface of the conductor? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 4.52 × 105 N/C B) 2.26 × 105 N/C C) 9.04 × 105 N/C D) 0.452 N/C E) 0.226 N/C
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a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization