A machine gear consists of 0.40 kg of iron and 0.16 kg of copper. How much total heat is generated in the part if its temperature increases by 35°C? (Specific heats of iron and copper are 450 and 390 J/kg • °C, respectively.)
a. 910 J
c. 4000 J
b. 8500 J
d. 5300 J
B
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Elliptical galaxies are primarily made up of massive O and B stars
Indicate whether the statement is true or false
In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? (
is the velocity of the light wave.)
A.
.B.
C.
D.
E.
When the sum of the external forces and the sum of the external torques on a body are both zero, we can conclude that
a. the body is moving at constant velocity but is not rotating. b. the body is rotating at constant angular velocity but has no linear velocity. c. the body has neither linear nor angular velocity. d. the body may have constant linear or angular velocity, but not both simultaneously. e. the body may have constant linear or constant angular velocity, or both simultaneously.
What fraction of a radioactive sample has decayed after two half-lives have elapsed?
1.1/8 2.3/4 3.7/8 4.none of these