An object consists of a rod (of length 3.00 m and negligible moment of inertia) to which four small 3.50-kg masses are attached, one at each end and one at each point on the rod spaced at 1.00-m intervals. The moment of inertia of this object about an axis perpendicular to the rod and through one of the end masses:
a. is 49 kg·m2.
b. is 21 kg·m2.
c. is 31.5 kg·m2.
d. is 10.5 kg·m2.
e. cannot be uniquely determined until it is stated which inner mass the axis goes through.
a
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The boundary shown is that of a uniform magnetic field directed in the positive z direction. An electron enters the magnetic field with a velocity pointing along the x axis and exits 0.63 ?s later at point A. What is the magnitude of the magnetic field?
a.
18 ?T
b.
14 ?T
c.
28 ?T
d.
34 ?T
e.
227 ?T
During an isobaric process which one of the following does not change?
a. volume c. internal energy b. temperature d. pressure
Which ray passing through a thin lens does not change direction?
A. The ray going through the center of the lens. B. The ray parallel to the optical axis. C. Any ray coming from the focal point. D. All outgoing rays are deflected relative to the incoming rays.
When an automobile moves with constant velocity the power developed is used to overcome the frictional forces exerted by the air and the road. If the power developed in an engine is 50.0 hp, what total frictional force acts on the car at 55 mph (24.6 m/s)? One horsepower equals 746 W.
What will be an ideal response?