Ohm's law gives the relationship between
a. current and voltage.
b. work and current.
c. current and charge.
d. force and current.
a
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The silver lining on the glass surfaces of a Thermos bottle reduces energy that is transferred by
A) conduction. B) convection. C) radiation. D) friction. E) none of the above
A 10-m uniform beam weighing 100 N is supported by two vertical ropes at its ends. If a 400-N person sits at a point 2.0 m from the left end of the beam, what is the force that each rope exerts on the beam?
What will be an ideal response?
Why can't a worldline on a spacetime diagram be horizontal?
A) A horizontal worldline corresponds to something moving infinitely fast. B) A horizontal worldline represents traveling backward in time. C) A horizontal worldline represents moving at exactly the speed of light. D) A horizontal worldline is possible. It corresponds to a constant, finite speed. E) A horizontal worldline is possible. It corresponds to a stationary object.