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3 years ago

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Which statement best explains acceleration? A. It is the total distance covered over a period of time. B. It is a change in velo

city over a period of time. C. It is a change in displacement over a period of time. D. It is a change in direction over a period of time.

2 answers:

tatuchka [14]3 years ago

8 0

I think the answer is C.

Mnenie [13.5K]3 years ago

4 0

C and D can be examples. B is the whole definition.

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A solenoidal coil with 25 turns of wire is wound tightly around another coil with 300 turns. The inner solenoid is 25.0 cm long

joja [24]

Answer:

$5.65487\times 10^{-8}\ Wb$

$1.17\times 10^{-5}\ H$

-0.020475 V

Explanation:

$\mu_0$ = Vacuum permeability = $4\pi \times 10^{-7}\ H/m$

$N_1$ = Number of turns of coil = 25

$N_2$ = Number of turns of coil 2 = 300

$\frac{di_2}{dt}$ = Rate of current increased = $1.75\times 10^3\ A/s$

d = Diameter = 2 cm

r = Radius = $\frac{d}{2}=\frac{2}{2}=1\ cm$

A = Area = $\pi r^2$

Magnetic field in the solenoid is given by

$B=\mu_0\frac{N_2}{l}I\\\Rightarrow B=4\pi\times 10^{-7}\frac{300}{0.25}\times 0.12\\\Rightarrow B=0.00018\ T$

Magnetic flux is given by

$\phi=BA\\\Rightarrow \phi=0.00018\times \pi\times 0.01^2\\\Rightarrow \phi=5.65487\times 10^{-8}\ Wb$

The average magnetic flux through each turn of the inner solenoid is $5.65487\times 10^{-8}\ Wb$

Mutual inductance is given by

$L=\frac{N_1\phi}{i_1}\\\Rightarrow L=\frac{25\times 5.65487\times 10^{-8}}{0.12}\\\Rightarrow L=1.17\times 10^{-5}\ H$

The mutual inductance of the two solenoids is $1.17\times 10^{-5}\ H$

Induced emf is given by

$V=-L\frac{di_2}{dt}\\\Rightarrow V=-1.17\times 10^{-5}\times 1.75\times 10^3\\\Rightarrow V=-0.020475\ V$

The emf induced in the outer solenoid by the changing current in the inner solenoid is -0.020475 V

5 0

3 years ago

A boat travels at 15 m/s in a direction 45° east of north for an hour. The boat then turns and travels at 18 m/s in a direction

Nuetrik [128]

Answer:

brainly.com/question/5055678

Explanation:

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3 years ago

How did private industries benefit from military expenditures?

Dafna11 [192]

Answer:

option A: the government paid private industries for goods and services.

Explanation:

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2 years ago

Which statement best describes the relationship between mass and gravitational attraction (pull)?

Gnesinka [82]

Answer:

The first option, "The more mass an object has, the greater the gravitational pull. "

Explanation:

Newton's Law of Gravity states that $F_G=\frac{Gm_1m_2}{r^{2}}$ , where G is the gravitational constant, $m_1$ and $m_2$ are the masses of the two objects, and <em>r</em> is the distance between the objects' centers. Because the objects' masses are in the fraction's numerator, they are directly proportional to $F_G$ , and increasing the mass of one or both objects increases the gravitational pull.

Please have a great day! I hope this helps you understand the question!

7 0

3 years ago

Help and explain please

babunello [35]

Answer: a) Moment = 200N.m

b) F = 500N

Explanation: <u>Moment</u> or <u>Torque</u> is the tendency of a body to rotate because of an aplplied force. It can be calculated as

$\tau = F.r.sin\theta$

F is force applied

r is distance from the force to the point of rotation

θ is the angle formed between force and distance

a) Since F and r are perpendicular, θ=90°, sin90° = 1, so

$\tau=F.r$

$\tau=100(2)$

$\tau=$ 200

<u>Torque</u><u> caused by weight of the barrier at the pivot is </u><u>200N.m</u>

<u />

b) Counterweight has the same torque as pivot: $\tau=$ 200

So, to find Force necessary to balance the weight:

$\tau=F.r$

$F=\frac{\tau}{r}$

$F=\frac{200}{0.4}$

F = 500

<u>It is necessary </u><u>a force of 500N</u><u> from the counterweight to balance the weight.</u>

<u />

4 0

3 years ago