Answer:
Amy's average speed is equal to Chris's average speed.
Explanation:
Average speed is the ratio of total distance and total time interval
So here for Amy we know that
now the average speed of Amy is given as
Similarly for Chris we will have
average speed =
so correct answer is
Amy's average speed is equal to Chris's average speed.
Seven
<em><u>Formula</u></em>
I'm assuming that the formula used is
R = R_ref [1 + α*(T - T_ref)=
<em><u>Givens</u></em>
- R_ref is the starting resistance of 100 ohms
- α (alpha) = 4.0 *10^-4 or 0.00040
- T_ref = 11.5 degrees Celcius
- T = 10 degrees.
- R=??
<em><u>Solution</u></em>
R = 100[ 1 + 4.0*10^4(10 - 11.5)] Collapse the brackets.
R = 100[ 1 + 4.0*10^4(-1.5)] Simplify
R = 100[1 - 0.00060] Subtract
R = 100[0.9994] Multiply
R = 99.94
Answer: A
Eight
The accepted formula for resistance and resistivity is
R = ρ * A / L where
rho is the resistivity
A is the face Area of the conductor
L is the length of the conductor.
Now a perfect conductor has a resistance of 0.
So since resistivity is a direct variation with resistance, its value also has to be 0.
Answer: A
Nine
The formula you need for this is W = I^2* R
W = 14 Watts
R = 17 ohms
I = ??
14 = I^2 * 17 Divide bother sides by 17
14/17 = I^2
0.8235 = I^2 Switch and take the square root of both sides.
I = sqrt(0.8234)
I = 0.9075 Answer: D
B) 20 cm
The height and distance will be the same. Only the image will be laterally inverted.