The table below shows the total revenue schedule of a firm. Use the information to answer the question that follows
| Output (units) | 50 | 60 | 70 | 80 | 90 |
| Total revenue (TR) $ | 85 | 102 | 119 | 136 | 153 |
What is the firm's marginal revenue?
$153.00
$17.00
$1.70
$0.80
Correct answer is C
Marginal revenue = the change in total revenue divided by the change in total output quantity.
MR = \(\frac{17}{10}\) = $1.7
1.550m
0.646m
5.120m
0.195m
Correct answer is B
f = 512Hz, V = 331m/s λ = ?
V = f λ
λ = \(\frac{v}{f} = \frac{331}{512}\)
λ = 0.646m.
The diagram above illustrates a velocity-time graph. Determine the distance between X and Y.
80.0m
160.0m
40.0m
10.0m
Correct answer is B
Distance between X and Y is the area of rectangular portion of the velocity-time graph.
XY = 40 × (8 - 4) = 40 × 4
∴ XY = 160 m
50V
30V
70V
40V
Correct answer is D
At resonance, the inductive reactance is equal to the capacitive reactance. This means that the voltage across the inductor is also equal to the voltage across the capacitor.
Therefore, the voltage across the capacitor is 40 V.
The type of mirror used by dentists to inspect the teeth of patients is a
Plane mirror
cylindrical mirror
concave mirror
convex mirror
Correct answer is C
The type of mirror used by dentists to inspect the teeth of patients is a concave mirror.
Concave mirrors are curved inwards and produce a magnified image of the object placed within its focus and pole. This is why dentists use concave mirrors to examine teeth, as it allows them to see the teeth in more detail.
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