Air with a density of 1.20 
flows through a 10.0 cm diameter pipe with a velocity of 1.20 m/s. What is the mass flow rate?
A. 0.0148 kg/s
B. 0.0131 kg/s
C. 0.0120 kg/s
D. 0.0113 kg/s
E. 0.0098 kg/s
D. 0.0113 kg/s
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Observations in the X-ray portion of the spectrum are routinely done from the surface of the Earth
Indicate whether the statement is true or false
Neutron stars have
A) very strong bi-polar magnetic fields. B) weak or non-existent magnetic fields. C) periods of days or weeks. D) monopolar fields that switch polarity every rotation. E) no relation to pulsars.
A 9.0-kg hanging weight is connected by a string over a pulley to a 5.0-kg block sliding on a flat table. If the coefficient of sliding friction is 0.19, find the tension in the string
?
?
a.
59.0 N
b.
67.5 N
c.
20.7 N
d.
37.5 N
Fusion is used in
a. atomic bombs b. power plants c. energy for stars d. hydrogen bombs e. a tokamak reactor