If 30 kJ of heat flows out of a system and 15 kJ of work is done by the system, then what is the change in internal energy?
A. 85 kJ
B. 70 kJ
C. 45 kJ
D. 15 kJ
E. 10 kJ
C. 45 kJ
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The segment of wire (total length including portions of incoming and outgoing wire = 6R) is formed into the shape shown and carries a current I. What is the magnitude of the resulting magnetic field at the point P?
A.
B.
C.
D.
E.
A slide projector is designed with its lens 6.0 m from the screen. The projected image is 1.5 m square of a slide object 2.5 cm square
(a) What is the object distance from the lens? (b) What should be the lens focal length? (c) What is the lens POWER?
Niels Bohr reasoned that a discrete line spectrum must be the result of a(n) ______________ effect
Fill in the blank(s) with correct word
In an effort to loosen the bolt on the wheel of a car, a man with a mass of 70 kg steps on the end of a 50-cm tire iron which is extending horizontally from the bolt. How much torque is he applying to the bolt?
A) 340 N m B) 14 N m C) 140 N m D) 70 N m E) 35 N m