The time rate of change of the total angular momentum of a system of particles equals the resultant external torque on the system
Indicate whether the statement is true or false
TRUE
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Calculate: (a) time elapsed in cooling the surface of the sphere to 204°C and (b) time elapsed in cooling the center of the sphere to 204°C.
A steel sphere with a diameter of 7.6 cm is to be hardened by first heating it to a uniform
temperature of 870°C and then quenching it in a large bath of water at a temperature of 38°C.
The following data apply
GIVEN
FIND
(a) Time elapsed in cooling the surface of the sphere to 204°C
(b) Time elapsed in cooling the center of the sphere to 204°C
ASSUMPTIONS
Constant water bath temperature, thermal properties, and transfer coefficient
SKETCH
Components: The components of vectors 
and 
are given as follows: Bx = -9.2 Cx = -4.5 By = -6.1 Cy = 4.3The angle (less than 180°) between vectors 
and 
is closest to
A. 77°. B. 103°. C. 10°. D. 170°. E. 84°.
When forming covalent compounds, atoms ______________ electrons
Fill in the blank(s) with correct word
Which one of the following conditions is not a requirement for a particle to experience a magnetic force when placed in a magnetic field?
a) The particle must be moving. b) The particle must be charged. c) The particle must not be under the influence of any other forces. d) The velocity of the particle must have a component that is perpendicular to the direction of the magnetic field.