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3 years ago

Allison wants to determine the density of a bouncing ball. which metric measurements must she use?

Physics

1 answer:

lubasha [3.4K]3 years ago

3 0

Density depends on mass and volume so option D is correct answer. Hope this helps!

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If the loop is removed from the field region in a time interval of 2.8 ms , find the average emf that will be induced in the wir

nekit [7.7K]

The question is incomplete. The complete question is :

A circular loop of wire with a radius of 15.0 cm and oriented in the horizontal xy-plane is located in a region of uniform magnetic field. A field of 1.2 T is directed along the positive z-direction, which is upward. (a)If the loop is removed from the field region in a time interval of 2.8 ms, find the average emf that will be induced in the wire loop during the extraction process.

Solution :

Let us consider a $\text{circular loo}p \text{ of wire}$ which has a $\text{radius}$ of r = $15$ cm.

It is oriented horizontally along the xy-plane and is located in the region of an $\text{uniform magnetic field}$ , such that it points in the positive z direction and having a magnitude of B = 1.2 T.

Now if the loop $\text{is removed from the field region}$ in a time interval of Δt = 2.8 ms. Initially the magnetic field and the area points is in the same direction, so that the angle between them is Ф = 0°, thus the initial and the final fluxes are :

$\phi_{B,i}=BA \cos (\phi) = BA$ and $\phi_{B,f} = 0$

Area A = $\pi r^2.$ The induced emf equals to the change in the flux, and is divided by the time that it takes to go from the initial flux, Δt and multiplied by the number of turns N = 1, i.e. ,

$\epsilon = -\frac{\Delta \phi_{B}}{\Delta t}$

$=-\frac{0-(1.2 T)\pi(0.15^2)}{2.8 \times 10^{-3}}$

= 30.27 V

Therefore, the emf generated is 30.27 V.

7 0

2 years ago

the temperature of a body fell from 100°c to 50°c in 10 minutes. the surrounding temperature was 20°c. what is the temperature a

Anna007 [38]

Answer:

The temperature is 10 c

4 0

3 years ago

What is the speed of light ?

Brrunno [24]

Answer:

299792458 metres per second

Explanation:

3 0

3 years ago

The tape in a videotape cassette has a total

xxMikexx [17]

Answer:

$w=19.76 \ rad/s$

Explanation:

<u>Circular Motion </u>

Suppose there is an object describing a circle of radius r around a fixed point. If the relation between the angle of rotation by the time taken is constant, then the angular speed is also constant. If that relation increases or decreases at a constant rate, the angular speed is given by:

$w=w_o+\alpha \ t$

Where $\alpha$ is the angular acceleration and t is the time. If the object was instantly released from the circular path, it would have a tangent speed of:

$\displaystyle v_t=w.r$

We have two reels: one loaded with the tape to play and the other one empty and starting to fill with tape. They both rotate at different angular speeds, one is increasing and the other is decreasing as the tape goes from one to the other. We'll assume the tangent speed is constant for both (so the tape can play correctly). Let's call $w_1$ the angular speed of the loaded reel and $w_2$ that from the empty reel. We have