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2 years ago

The speed of an object doubles.How does the change in the magnitude of the objects

Physics

1 answer:

IgorC [24]2 years ago

8 0

Answer:

The change in kinetic energy is twice the change in momentum

Explanation:

The momentum of an object is given by:

where

m is the mass of the object

v is its velocity

While the kinetic energy is given by

We want to check how these two quantities change when the speed of the object doubles, therefore when the new velocity is

For the momentum, we have

So, the momentum doubles.

For the kinetic energy, we have

So, the kinetic energy quadruples.

Therefore, the change in kinetic energy is twice the change in momentum.

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The magnetic field at the center of a 1.50-cm-diameter loop is 2.70 mT . Part A. What is the current in the loop?

elixir [45]

Explanation:

It is given that,

Diameter of the circular loop, d = 1.5 cm

Radius of the circular loop, r = 0.0075 m

Magnetic field, $B=2.7\ mT=2.7\times 10^{-3}\ T$

(A) We need to find the current in the loop. The magnetic field in a circular loop is given by :

$B=\dfrac{\mu_o I}{2r}$

$I=\dfrac{2Br}{\mu_o}$

$I=\dfrac{2\times 2.7\times 10^{-3}\times 0.0075}{4\pi \times 10^{-7}}$

I = 32.22 A

(b) The magnetic field on a current carrying wire is given by :

$B=\dfrac{\mu_o I}{2\pi r}$

$r=\dfrac{\mu_o I}{2\pi B}$

$r=\dfrac{4\pi \times 10^{-7}\times 32.22}{2\pi \times 2.7\times 10^{-3}}$

r = 0.00238 m

$r=2.38\times 10^{-3}\ m$

Hence, this is the required solution.

8 0

2 years ago

How many times has the Sun orbited around the Milky Way since the Sun first formed, if the Sun makes one orbit every 231 million

natta225 [31]

Answer:

It would depend on the amount of years.

Explanation:

I don’t think this is very helpful-

Have a great day!

Anygays-

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2 years ago

A linebacker runs at 3 m/s and collides with a running back running towards him at 3.2

Anit [1.1K]

Answer:b

Explanation:

im in fifth grade so i guessd. gl tho heh.

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2 years ago

Which of the following is NOT a true statement about error in hypothesis testing?Choose the correct answer below.A.The symbol a

Marizza181 [45]

Answer:

Option D

A type I error is making the mistake of rejecting the null hypothesis when it is actually false.

Explanation:

Error type I is usually represented by alpha symbol and type I error entail making a mistake of rejecting the null hypothesis when it's actually true. Type II error on the other side involves making a mistake of failing to reject null hypothesis when it is actually false. The statement in option D is false because it contradicts the definition of type I error above hence the only false statement in relation to hypothesis testing is option D, A type I error is making the mistake of rejecting the null hypothesis when it is actually false.

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3 years ago

A bicyclist accelerates at 0.89 m/s2 during a 5.0 s interval. What is the change in speed if the bicyclist and the bicycle?

Allisa [31]

Answer:

attached below

Explanation:

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2 years ago