When you arrive at Duke’s Dude Ranch you are greeted by the large wooden sign shown in Figure 11-60. The left end of the sign is held in place by a bolt, the right end is tied to a rope that makes an angle of 20 0° with the horizontal. If the sign is uniform, 3 20 m long, and has a mass of 16 0 kg, what are (a) the tension in the rope, and (b) the horizontal and vertical components of the force, F → , exerted by the bolt? Figure 11-60 Problem 80
When you arrive at Duke’s Dude Ranch you are greeted by the large wooden sign shown in Figure 11-60. The left end of the sign is held in place by a bolt, the right end is tied to a rope that makes an angle of 20 0° with the horizontal. If the sign is uniform, 3 20 m long, and has a mass of 16 0 kg, what are (a) the tension in the rope, and (b) the horizontal and vertical components of the force, F → , exerted by the bolt? Figure 11-60 Problem 80
When you arrive at Duke’s Dude Ranch you are greeted by the large wooden sign shown in Figure 11-60. The left end of the sign is held in place by a bolt, the right end is tied to a rope that makes an angle of 20 0° with the horizontal. If the sign is uniform, 3 20 m long, and has a mass of 16 0 kg, what are (a) the tension in the rope, and (b) the horizontal and vertical components of the force,
F
→
, exerted by the bolt?
For items 8-9, refer to the problem below.
Find all the currents flowing in every resistor, power dissipation in
every resistor and the total power of the circuit shown at the right
using...
8. Kirchhoff's Laws (5 pts)
9. Maxwell's Mesh Analysis (5 pts)
A
8 V
10 V
B
+
20 Ω
3Ω
202
wwww
C
wwww
202
+
50
www
12 V
•
Nature of Resistance
Temperature-Resistance Relationship
Ohm's Law, Energy and Power
Kirchhoff's Law
• Maxwell's Mesh Analysis
1. A coil of copper wire (p = 10.37 2-cmil/ft) has a length of 600 ft. What is the length of an aluminum conductor
(p 17 cmil/ft), if its cross-sectional area and resistance are the same as those of the copper coil? (Hint: Look
for conversion of inches to mils and square inches to square foot. Include it in your solution.) (1 pt)
2. The copper field winding of an electric machine has a resistance of 46 at temperature of 22°C. What will be
its resistance at 75°C? (Use do = 0.00427 /°C for copper) (1 pt)
3. The resistivity of a copper rod 50 ft long and 0.25 inch in diameter is 1.76 μ at 20°C. What is its resistance at -
20°C? (1 pt)
4. When two resistors A and B are connected in series, the total resistance is 36 2. When connected in parallel, the
total resistance is 8 Q. What is the ratio of the resistance RA to resistance RB? Assume RA < RB. (1 pt)
5. The…
2. Two equally strong individuals, wearing
exactly the same shoes decide to do a tug of
war. The only difference is individual A is
2.5 meters tall and individual B is 1.5 meter
tall. Who is more likely to win the tug of
war?
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