666.
Calculate the effective resistance between P and Q in the diagram above
A.
0.75\(\Omega\)
B.
4.00\(\Omega\)
C.
5.00\(\Omega\)
D.
7.00\(\Omega\)
Correct answer is B
R = \(\frac{1}{2} + \frac{1}{2} + 3 = 1 + 3 = 4\Omega\)
667.
A.
10.5N
B.
11.0N
C.
17.3N
D.
20.0N
Correct answer is D
10 - P sin 30 = 0
10 - P x 0.5 = 0
P = 20N
668.
A.
it is very hot at the equator
B.
the spring balance has expanded
C.
the acceleration of free fall due to gravity varies with location
D.
the mass of the body is reduced
Correct answer is C
No explanation has been provided for this answer.
669.
A.
100Nm-2
B.
200Nm-2
C.
300Nm-2
D.
400Nm-2
Correct answer is A
P = \(\frac{wt}{A} = \frac{200}{2 \times 1} = 100Nm^{-2}\)
670.
A.
18kW
B.
20kW
C.
180kW
D.
200kW
Correct answer is A
P = FV
= 600 x 30 = 18kW
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