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Vinvika [58]
3 years ago
12

Which of these is NOT needed to sustain life on a planet? *

Physics
1 answer:
Vadim26 [7]3 years ago
7 0
I think it’s proximity of the sun
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A current runs to the right in a long, straight wire. What is the direction of the
SIZIF [17.4K]

Answer:

Into the page (Answer B)

Explanation:

Recall that the magnetic field that is created around a current conducting wire follows the right hand rule, where the direction of your fingers point in the direction of the magnetic field vectors when your thumb points in the direction of the current flow.

Use this to see that as you place the thumb of your right hand on the page pointing to the right (direction of the current in the wire). As you do so, you find the four fingers of your right hand entering the paper.

7 0
3 years ago
The potential difference across a resistor increases by a factor of 2. How does the current change? (Ohm's law: V = IR) A. It de
Sedaia [141]
The answer is C.

The question says the potential difference is what is changing, which means we're solving for V.

It tells us that potential difference increases by a factor of two, which just means V doubles.

With this info, we can pick some numbers, plug it into Ohms law and see what happens.

Here's an example where I just picked random numbers that are easy to work with:

V=I*R
10=I*5
I=2
Lets increase the potential difference (V) by a factor of two and see what happens to current:
V=I*R
20=I*5 (all I've done is double the potential difference from 10 to 20)
I=4

When we increase V by a factor of 2, I increases by a factor of 2. We went from I=2 to I=4.
We can increase V by factor of 2 again and see:
V=I*R
40=I*5
I=8

Okay, current just increased by a factor of 2 again when we increased the potential difference by a factor of 2.

It's always good to check work with alternate numbers, so here's one more set:
V=I*R
16=I*4
(remember, we know we're solving for V, so I'm just plugging in random numbers for I and R)
I=4
Increase V by factor of 2:
32=I*4
I=8

So, when we increase V (the potential difference) by a factor of 2, I (current) always increases by a factor of 2 as well.

Hope this helps!





3 0
3 years ago
Read 2 more answers
A 2 kg ice cube is released from point A and slides on a frictionless track as shown in the figure. Determine the speed of the c
kherson [118]

According to the conservation of energy

  • Potential energy at any given instance is equal to the Kinetic energy as energy can neither be created nor be destroyed

Mass is 2kg=m

#A

h=5m

  • PE=mgh

PE

  • 2(9.8)(5)
  • 10(9.8)
  • 98J

Now

  • KE=98J
  • 1/2mv²=98J
  • 1/2×2v²=98J
  • v²=98J
  • v=√98
  • v=9.4m/s

#B

h=3.2m

PE:-

  • 2(3.2)(9.8)
  • 6.4(9.8)
  • 62.7J

Now

  • KE=62.7J
  • 1/2mv²=62.7
  • v²=62.7
  • v=√62.7
  • v=7.9m/s

#C

h=2m

PE

  • 2(2)(9.8)
  • 4(9.8)
  • 39.2J

Now

  • v²=39.2
  • v=√39.2
  • v=6.3m/s
8 0
2 years ago
How is energy conserved when a pan of water on an electric stove comes to a boil
Flura [38]

Answer:

Choices?

Explanation:

5 0
3 years ago
A man weighing 800 newtons is standing on a chair. In order to support the man, the chair is exerting a force of.
san4es73 [151]

The chair is exerting a force of 800N.

Force is a quantity that is used to describe the interaction between two objects. Forces can cause objects to accelerate, decelerate, or change direction. In other words, forces can cause objects to move or change the way they are moving. The weight of an object is a measure of the force of gravity on that object and is calculated by multiplying the object's mass by the acceleration due to gravity.

In the given case, It would need a force equal to his weight (800 N) pressing in the opposite direction for the man to be able to rise up in the chair. Therefore, the 800 N force would be pushed upwards if he were to press down by standing on it.

Read more about the force on:

brainly.com/question/27943482

#SPJ4

7 0
9 months ago
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