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2 years ago

1

Physics

1 answer:

Ray Of Light [21]2 years ago

4 0

Acceleration = Force \ mass

0,375N/0,60kg=0.6ms-2

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________ is a measure of the particle size a stream can transport.

Over [174]

Is there any answers choices..?

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3 years ago

A solenoidal coil with 21 turns of wire is wound tightly around another coil with 350 turns. The inner solenoid is 25.0 cm long

77julia77 [94]

A) We need to calculate the Magnetic flux of a Solenoid,

$\Phi = BA$

Where B is the magnetic field and A the Area.

$B=\frac{\mu_0 N_2 I}{l}$

Here \mu_0 is the permeability constant, I the current and N number of turns.

Replacing we have,

$\Phi = \frac{\mu_0 N_2 I}{l}(\pi r^2)$

$\Phi = \frac{(4\pi*10^{-7})(350)(0.12)}{25*10^{-2}} (\pi*\frac{2.5*10^{-2}}{2}^2)$

$\Phi = 1.036*10^{-7}Wb$

B) We calculate the mutual inductance, so

$M=\frac{N_1 \Phi}{i}$

$M=\frac{21*1.036*10^{-7}}{0.12}$

$M=1.813*10^{-5}H$

c) We calculate the emf

$\epsilon = -M \frac{dI}{dt}$

$\epsilon = -1.813*10^{-5}*1700$

$\epsilon= -0.030V$

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3 years ago

Humans can hear frequencies as low as 21 Hz. If sound is measured during 3 seconds how many wavelengths pass?

SVEN [57.7K]

63 hertz.
This is because a hertz is how often a sound wave repeats.

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4 years ago

A car is moving with a constant velocity of 25 m/s. Which of the following is true?

S_A_V [24]

b) the net force on the car is zero.

Explanation:

Let's analyze each option one by one:

a) the force from the engine is greater than all the forces of friction. --> FALSE. In fact, the car is moving at constant velocity: this means that its acceleration is zero,

a = 0

and so Newton's second law becomes

$\sum F = ma = 0$

where $\sum F$ is the net force on the car and m is its mass. This means that the net force on the car is zero: so, the force from the engine cannot be greater than all the forces of friction, otherwise the net force cannot be zero.

b) the net force on the car is zero. --> TRUE, for what we said at point A)

c) the inertia is changing. --> FALSE. The inertia of an object just depend on the mass and the velocity of the object: as neither the mass nor the velocity are changing in this problem, then the inertia of the car is not changing.

d) the forces of friction are proportional to the acceleration of the car. --> FALSE. Generally, the force of friction acting on an object moving on a flat surface is

$F_f = \mu mg$

where $\mu$ is the coefficient of friction, m is the mass, and g the acceleration of gravity. Therefore, the force of friction does not depend on the acceleration of the car.