Kinetic energy is conserved in elastic collisions
a. True
b. False
Indicate whether the statement is true or false
True
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Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger the longer their period of variation is?
a. Henrietta Leavitt b. Edwin Hubble c. John Glenn d. Carl Sagan e. Harlow Shapley
Suppose you are facing a tall makeup mirror on a vertical wall. Fluorescent tubes framing the mirror carry a clockwise electric current. What is the direction of the magnetic field created by that current at the center of the mirror?
1.left 2.right 3.horizontally toward you 4.horizontally away from you 5.no direction because the field has zero magnitude
The activation enthalpy for vacancy diffusion contains two contributions: the activation enthalpy for vacancy _____________and atom migration.
Fill in the blank(s) with the appropriate word(s).
A steel wire hangs from a high-altitude balloon. The steel has unit weight of 77 kN/m3 and yield stress of 280 MPa. The required factor of safety against yield is 2.0. The maximum permissible length of the wire is approximately:
(A) 1800 m (B) 2200 m (C) 2600 m (D) 3000 m