As Chelsea removes her clothes from the dryer, she sees sparks, which are examples of .
2 answers:
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Answer:
v = 0.5 [m/s]
Explanation:
In order to determine the speed in such a time interval, we must calculate the slope between the last two positions.
The slope of a line is determined by the following mathematical expression.
P₂ = point 2 = (12,12) = (x₂,y₂)
P₁ = Point 1 = (6,9) = (x₁,y₁)
In this specific case, we must see that in the x-axis we have time, and on the y-axis, we have the space axis.
Now using the slope:
This slope is equal to the speed (velocity)
v = 0.5 [m/s]
Answer: option A. r = 3x+2y
Explanation:
Vector r is plotted on the graph. On x-axis each small division corresponds to 1 unit. Similarly on y-axis, each small division corresponds to one unit.
The vector is the resultant of addition of its x and y components. we would draw perpendicular to the x-axis and y-axis from the head of vector r.
On x-axis, = +3 units
on y-axis, = +2 units
Hence, vector r can be written as: r = 3x + 2y . Correct option is A.
Answer:
Terminal voltage = 11.5 V
Power across load = 119.7 W
Power across internal resistance = 5.4 W
Power delivered by battery = 125.2 W
Explanation:
The current in the circuit is given by
where E is the emf of the battery, R us the load resistance and r is the internal resistance.
The terminal voltage is the potential difference across the load resistor.
V = I × R = 10.43 A × 1.1 Ω = 11.5 V
The power across any resistance is given by
For the load resistor,
For the internal resistance,
The power delivered by the battery is
This could also be found by
The discrepancy in both answers is due to the approximations. The second answer is better.