Answer:
5ohms and 20ohms
Explanation:
Let the resistance of each wire be R1 and R2, if the equivalent resistance in series is 25 ohms, then;
R1 + R2 = 25 ...1
If the equivalent in parallel is 4 ohm, then;
1/R1 + 1/R2 = 1/4
R2+R1/R1R2 = 1/4
Cross multiply
4(R2+R1) = R1R2 ...2
From 1;
R1 = 25 - R2 ... 3
Substitute 3 into 2
4(R2+25-R2) = (25-R2)R2
4(25) = (25-R2)R2
100 = 25R2 - R2²
R₂² -25R₂+100 = 0
R₂² -20R₂-5R₂+100 = 0
R₂(R₂-20)-5(R₂-20) = 0
(R₂-5)(R₂-20)=0
R₂ = 5 or 20
Since R₁ = 25-R₂
R₁ = 25 - 5
R₁ = 20
Hence the resistances are 5ohms and 20ohms
Answer:
B
Explanation:
A body has kinetic energy that is moving
Answer:
3.95 x 10⁵ Pa
Explanation:
given,
depth of water tank = 10 m
bottom tank height = 20 m
density of water = 1000 Kg/m³
diameter of hose = 2 cm
Pressure at ground level = ?
net head of water from the ground
H = 20 + 10
H = 30 m
pressure exerted at the ground
P = ρ g h
P = 1000 x 9.8 x 30
P = 2.94 x 10⁵ Pa
atmospheric pressure = 1.01 x 10⁵ Pa
total pressure on the ground
= atmospheric pressure + pressure due to water tank
= 1.01 x 10⁵ Pa + 2.94 x 10⁵ Pa
= 3.95 x 10⁵ Pa
Incomplete question. I inferred you want access to the full question.
Explanation:
A rural mail carrier is driving slowly, putting mail in mailboxes near the road. He overshoots one mailbox, stops, shifts into reverse, and then backs up until he is at the right spot. The velocity graph given below represents his motion.
a. draw the mail carrier's position vs time graph. Assume that x = 0 m at t = 0 s.
b. what is the position of the mailbox?
Answer:
A
Explanation:
to simplify let's make it apart the denominator into three part
now let's simplify
so the answer is A
hope it helps
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