A car is traveling 12m/s. It approaches a stop sign and decelerates at 4.0m/s squared. How long does it take the car to stop?

If the magnetic field a perpendicular distance r to the left of a current-carrying wire is 10 T, what will the net magnetic fiel

larisa86 [58]

Answer:

30 T

Explanation:

The magnetic field due to first wire at point A is $B_1=\frac{\mu _0i}{2\pi r}$

Magnetic field due to second wire at point A is $B_2=\frac{\mu _02i}{2\pi r}$

As the current flows in opposite direction in both the wire so net magnetic magnetic field at point A is $B=B_1+B_2=\frac{\mu _0i}{2\pi r}+\frac{\mu _02i}{2\pi r}=\frac{\mu _03i}{2\pi r}$

So net magnetic field $B=3B_1=3\times 10=30T$ as $B_1$ is given as 10 T in question

8 0

3 years ago

Saki is ice-skating to the left with a velocity of 5\,\dfrac{\text{m}}{\text{s}}5 s m . A steady breeze starts blowing, causin

Bad White [126]

Answer:

-14 m/s

Explanation:

Saki's initial velocity is:

$u = - 5 m/s$

where we put a negative sign because the problem tells us to use a coordinte system in which rightward is positive, while Saki's initial velocity is towards the left.

Saki's acceleration due to the breeze is:

$a=-1.5 m/s^2$

Where again, we put a negative sign since the acceleration is leftward.

In order to find Saki's velocity after t = 6 s, we can use the following equation:

$v(t)=u+at$

And substituting all the numbers, we get

$v(6 s)=-5 m/s + (-1.5 m/s^2)(6 s)=-14 m/s$

and the negative sign means the new velocity is leftwards.

8 0

3 years ago

1. A 12 kilogram block is sitting on a platform 24 m high. How much Potential energy does

Mazyrski [523]

The amount of potential energy the block contains is 2,822.4 Joules

<u>Given the following data:</u>

Mass of block = 12 kg

Height of platform = 24 meters.

We know that the acceleration due to gravity (g) of an object on planet Earth is equal to 9.8 $m/s^2$ .

To determine the amount of potential energy the block contains:

Mathematically, potential energy (P.E) is given by the formula;

$P.E = mgh$

Where:

m is the mass of object.

g is the acceleration due to gravity.

h is the height of an object.

Substituting the parameters into the formula, we have;

$P.E = 12 \times 9.8 \times 24$

Potential energy (P.E) = 2,822.4 Joules

8 0

3 years ago

Which changes will increase the rate of reaction during combustion

Marianna [84]

Answer:

reducing temperature of the surrounding

Explanation:

combustion reactions are exothermic so they give off heat. reducing the temperature of the surrounding will enable more efficient energy transfer

4 0

3 years ago

The sun delivers thermal energy to earth through radiation. which of the following is a consequence of this energy transfer

Zigmanuir [339]

Answer:

life is possible on earth

Explanation:

The sun delivers thermal energy to earth through radiation. Due to solar energy life of earth is possible on earth because all the process of human life depends on the solar energy. Due to sunlight plants grow and prepare there food. Human and plant cycle depends on the food prepared by plant. Thus, we can say that life on earth is possible due to thermal energy provided by sun.

4 0

3 years ago

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