A 100-N little physics tyke hangs on the ends of a rope suspended over a pulley as shown. The tension in the rope is
1) 0 N.
2) 50 N.
3) 100 N.
4) 200 N.
It is interesting to note that
5) the tension in the rope at its midpoint (uppermost part) is 100 N.
6) this is a modified tug-o'-war example (simply draped over a pulley).
7) the net force acting on the rope is in this case identical to the child's weight.
Answer: 2, 6
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The earliest Homo sapiens appeared about
A) 25 million years ago B) 6 to 7 million years ago C) 200,000 years ago D) 545 million years ago
A toroid is made of 2000 turns of wire of radius 2.00 cm formed into a donut-shape of inner radius 10.0 cm and outer radius 14.0 cm. When a 30.0-A current is present in the toroid, the magnetic field at a distance of 11.0 cm from the center of the toroid is
a. 0.0857 T. b. 0.109 T. c. 0.120 T. d. 0.600 T. e. 0.685 T.
The observable ________ is a thin layer in which the solar material becomes suddenly much more opaque as we look deeper into the Sun
Fill in the blank(s) with correct word
Show that the rate of heat conduction per unit length through a long hollow cylinder of inner radius ri and outer radius ro, made of a material whose thermal conductivity varies linearly with temperature, is given by
GIVEN
• A long hollow cylinder
• The thermal conductivity varies linearly with temperature
• Inner radius = ri
• Outer radius = ro FIND
• Show that the rate of heat conduction per unit length is given by the above equation ASSUMPTIONS
• Conduction occurs in the radial direction only
• Steady state prevails
SKETCH
