Two identical particles move toward each other, one twice as fast as the other. Just before they collide, one has a kinetic energy of 25 J and the other 50 J. At this instant their total kinetic energy is
A) 25 J.
B) 50 J.
C) 75 J.
D) none of the above
E) need more information
Answer: C
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Mutual Inductance: A 73-mH solenoid inductor is wound on a form that is 0.80 m long and 0.10 m in diameter. A coil having a resistance of 7.7 ? is tightly wound around the solenoid at its center. The mutual inductance of the coil and solenoid is 19 ?H. At a given instant, the current in the solenoid is 820 mA and is decreasing at the rate of 2.5 A/s. At the given instant, what is the induced current in the coil?
A. 6.2 ?A B. 4.9 ?A C. 7.4 ?A D. 8.6 ?A E. 9.9 ?A
A steel bar of rectangular cross section (a 5 38 mm, b 5 50 mm) carries a tensile load P. The allowable stresses in tension and shear are 100 MPa and 48 MPa, respectively. The maximum permissible load Pmax is approximately:
(A) 56 kN
(B) 62 kN
(C) 74 kN
(D) 91 kN
An object is placed 25 cm in front of a lens of focal length 20 cm. 60 cm past the first lens is a second lens of focal length 25 cm. What is the resulting magnification of the object in this setup?
A.
B.
C.
D.
E.
If used in a single instrument to greatly enhance its resolution, the four separate mirrors of the VLT will be acting as a(n) ________
Fill in the blank(s) with correct word