An egg falls from a bird's nest in a tree and feels no effects due to the air. As it falls,
A) only its kinetic energy is conserved.
B) only its momentum is conserved.
C) both its kinetic energy and its momentum are conserved.
D) only its mechanical energy is conserved.
E) both its mechanical energy and its momentum are conserved.
D
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The production of interference colors requires
A) a reflecting surface. B) at least two reflecting surfaces. C) a medium with a relatively low index of refraction. D) none of the above
Suppose the ends of a 27-m-long steel beam are rigidly clamped at 0°C to prevent expansion. The rail has a cross-sectional area of 35 cm2 . What force does the beam exert when it is heated to 39°C? (?steel = 1.1 × 10^?5/C°, Ysteel = 2.0 × 10^11 N/m2)
a. 3.0E+5 N b. 1.2E+3 N c. 1.7E+3 N d. 2.3E+2 N e. 7.5E+4 N
A cylindrical wire of radius 2.0 mm carries a current of 2.5 A. The potential difference between points on the wire that are 46 m apart is 3.7 V
(a) What is the electric field in the wire? (b) What is the resistivity of the material of which the wire is made?
A crank is being turned clockwise at 120 rev/min. The handle is 10 cm from the axle of the crank
An observer some distance away sees the crank edge-on so he only perceives the vertical motion of the crank and not the horizontal motion. What equation describes the motion of the handle seen by the observer if at t=0 the crank is at y = 0 and moving in the negative y direction? A) y = (10 cm)cos((12.6 rad/s)t +3?/2 ) B) y = (10 cm)cos((12.6 rad/s + ?)t) C) y = (10 cm)cos((12.6 rad/s)t - ?/2 ) D) y = (10 cm)cos((12.6 rad/s)t) E) y = (10 cm)cos((12.6 rad/s)t + ?/2 )