When a substance is exposed to something that has a lower temperature,
a. work is done on it
b. work is done by it
c. heat is transferred from it
d. heat is transferred to it
e. none of the above
C
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In projectile motion the vertical component of the velocity at the top of the trajectory is
A. non-zero, and less than the initial vertical component of the velocity. B. non-zero, and equal to the initial vertical component of the velocity C. zero D. non-zero, and greater than the initial vertical component of the velocity
Two tiny particles having charges of +7.00 ?C and -9.00 ?C are placed along the y-axis. The +7.00-µC particle is at y = 0.00 cm, and the other particle is at y = 40.00 cm
Where must a third charged particle be placed along the y-axis so that it does not experience any net electric force due to the other two particles? A) 0.200 m B) 2.99 m C) -0.187 m D) -2.99 m E) 0.187 m
A hollow cylindrical (inner radius = 1.0 mm, outer radius = 3.0 mm) conductor carries a current of 80 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 2.0 mm from the axis of the conductor
a. 8.0 mT b. 3.0 mT c. 5.3 mT d. 16 mT e. 1.2 mT
A steel beam (E 5 210 GPa) with I 5 119 3 106 mm4 and span length L 5 3.5 m is subjected to uniform load q 5 9.5 kN/m. The maxi-mum deflection of the beam is approximately:
(A) 10 mm
(B) 13 mm
(C) 17 mm
(D) 19 mm