An ideal fluid in a pipe of diameter 14. cm is moving at 6.0 m/s
(a) If the incompressible fluid density is 1.05 grams/cc, what is the flow rate in kg/s?
(b) What is the speed of flow if the pipe narrows to 4.0 cm radius?
(a) 97. kg/s
(b) 18. m/s
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Giant and supergiant stars are rare because
a. they do not form as often as main-sequence stars. b. the star blows up before the giant or supergiant stage is reached c. the giant or supergiant stage is very short. d. the giant or supergiant stage is very long
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 24 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the opposite direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
A. 0.82 mT B. 0.93 mT C. 0.70 mT D. 0.58 mT E. 0.40 mT
An object moving at a constant speed requires 6.0 s to go once around a circle with a diameter of 4.0 m. What is the magnitude of the instantaneous acceleration of the particle during this time?
a. 2.2 m/s2 b. 2.7 m/s2 c. 3.3 m/s2 d. 3.8 m/s2 e. 4.4 m/s2
Bert says that a charged particle in a vacuum can travel in a helix only if a uniform electric field and a uniform magnetic field are both present and both parallel to the axis of the helix. Stuart says that only a magnetic field with a component parallel to the axis of the helix is needed. Which one, if either, is correct, and why?
a. Bert, because the charged particle's velocity can have a vertical component only if an electric field in the vertical direction is present. b. Stuart, because a component of velocity in the vertical direction is not changed by a vertical component of a magnetic field. c. Bert, because a component of velocity in the vertical direction is changed by a vertical component of a magnetic field. d. Stuart, because an electric field in the vertical direction would cause the particle to come to a complete stop. e. Neither, because particles cannot move in helical paths in the presence of magnetic and electric fields.