I think its b but not sure
I thought you were going to ask for the resistance of the unknown
series resistor. Since you only want the equivalent resistance of the
circuit, you don't even need to know the resistance of the lamp.
I = E / R
Current through the circuit = (voltage of the battery) / (circuit resistance).
0.5 = (12) / R
Multiply each side by 'R' : (0.5) R = 12
Multiply each side by 2 : <em>R = 24 ohms</em>
(Since the resistance of the lamp is 10 ohms, the
unknown series resistor is the other 14 ohms.)
Given what we know, we can confirm that as Halley's comet moves closer to the sun, we can expect its potential energy to be near its maximum.
<h3>How do we know this?</h3>
We can conclude that its potential energy will increase as it comes closer to the sun, and will reach its maximum at the closest point to the sun. This is because the potential energy of an object is directly proportional to the force of gravity acting on that object. As Halley's comet approaches the sun, the sun's gravitational pull on the comet is stronger, and thus, its potential energy increases.
Therefore, given the relationship between gravity and potential energy, we can confirm that s Halley's comet moves closer to the sun, we can expect its potential energy to increase and be near its maximum.
To learn more about potential energy visit:
brainly.com/question/21288807?referrer=searchResults
Answer:
3.7 km/h
Explanation:
Let's call v the proper speed of the boat and v' the speed of the water in the river.
When the boat travels in the direction of the current, the speed of the boat is:
v + v'
And it covers 50 km in 3 h, so we can write
(1)
When the boat travels in the opposite direction, the speed of the boat is
v - v'
And it covers 50 km in 5.4 h, so
(2)
So we have a system of two equations: by solving them simultaneously, we find the value of v and v':
![v+v'=16.7 \\v-v'=9.3](https://tex.z-dn.net/?f=v%2Bv%27%3D16.7%20%5C%5Cv-v%27%3D9.3)
Subtracting the second equation from the first one we get:
![(v+v')-(v-v')=16.7-9.3\\2v'=7.4\\v'=3.7](https://tex.z-dn.net/?f=%28v%2Bv%27%29-%28v-v%27%29%3D16.7-9.3%5C%5C2v%27%3D7.4%5C%5Cv%27%3D3.7)
So, the speed of the water is 3.7 km/h.