Which of these is NOT considered a fine example of galactic collisions?
A) the Cartwheel Galaxy
B) the Antennae Galaxies
C) the Whirlpool Galaxy
D) M-31 in Andromeda
E) M-87 in Virgo
D
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A box is pushed eastward across a rough horizontal floor by a force acting parallel to the floor. A force providing an impulse directed westward on the body is
A. a fictitious force. B. the applied force. C. normal reaction force of floor upward on body. D. friction. E. gravity.
A magnetar is a type of ____
a. hypernova b. neutron star c. black hole d. jet e. X-ray burster
A 72 nC charge is located at x = 3.00 m on the x-axis and an 8.0 nC charge is located at x = 7.0 m. At what point on the x-axis is the electric field zero?
A. - 9.0 m B. 4.0 m C. -5.0 m D. 6.0 m E. 6.3 m
A thin ribbon of a silver alloy 2.00-cm wide and 0.015 0-mm thick carries a current of 6.98 A perpendicular to a magnetic field. The Hall voltage is found to be 1.24 × 10?4 V when the magnetic field is 2.50 T. Calculate n, the number of charge carriers per cubic meter.
What will be an ideal response?