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2 years ago

Which if the following is an example of an element

Physics

1 answer:

belka [17]2 years ago

6 0

Answer:

Where's the question or the picture???

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Four compasses are placed around a wire, as shown. What is the best conclusion that can be drawn?

Usimov [2.4K]

The best conclusion that can be drawn is that D) A current does not flow in the wire

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3 years ago

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A machine lifts a 35 kg object doing 6860 J worth of work. How much power is produced by the machine if it lifts the object in 4

timofeeve [1]

Answer:

Explanation:

We need the power equation for this which is

P = Work/time

We have everything we need to solve this (the mass of the object is extra information):

P = 6860/4

P = 1715W

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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

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

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

$\epsilon= -0.030V$

3 0

3 years ago

The graph shows the motion of a car. Which segment shows that the car is slowing down? A, B, C, or D Graph:

shutvik [7]

Answer:

Segment c

Explanation:

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4 years ago

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a stone is vertically thrown upward with the velocity of 72km/hr find the maximum height reached the height

erik [133]

Answer:

y = 20.38 [m]

Explanation:

In order to solve these problems, we must use the following kinematics equation.

$v_{f} ^{2} =v_{i} ^{2}-(2*g*y)$

where:

Vf = final velocity = 0

Vi = initial velocity = 72 [km/h]

g = gravity acceleration = 9.81 [m/s^2]

y = vertical elevation [m]

We need to convert [km/h] to [m/s]

$72[\frac{km}{h}]*[\frac{1h}{3600s}]*[\frac{1000m}{1km} ] = 20 [m/s]$

Note: the negative sign of the equation means that the acceleration acts in the opposite direction to the movement of the body. And the final speed is zero, because when the body reaches the maximum height, the Stone does not move its speed has been reduced to its entirety.

0 = (20)^2 - (2*9.81*y)

20^2 = 2*9.81*y

y = 20.38 [m]

3 0

3 years ago

Which if the following is an example of an element​

Which if the following is an example of an element