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Elena-2011 [213]

3 years ago

10

Green light shines through a 100-mm-diameter hole and is observed on a screen. If the hole diameter is increased by 20%, does th

e circular spot of lig

1 answer:

Sergio [31]3 years ago

6 0

I think it’s by 17 percent

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What is the relationship between electric field lines and equipotential lines that you observed in doing the lab

lidiya [134]

Answer:

Explained below

Explanation:

Generally speaking, we know in physics that Electric field lines are lines which usually start at positive charges and deflect away from them to terminate at the negative charges. Meanwhile Equipotential lines are lines that are used to connect points located on the same electric potential.

Finally, in conclusion, electric field lines are usually lines that go through in a perpendicular manner across every equipotential lines.

8 0

3 years ago

What is the velocity of a plane that took 2 hours to travel 1000 miles north?

professor190 [17]

D mid Univisionhdjfjfjfnfjzkakaozkdmxifjfifnfjcifjdnsnsn

3 0

3 years ago

A 4 kg object is moving at a speed of 5 m/sec. How much kinetic energy does the object have? A. 10 joules B. 20 joules C. 50 jou

sp2606 [1]

Answer:

A. 10 joules

Explanation:

Given parameters:

Mass of object = 4kg

Speed = 5m/s

Unknown:

Kinetic energy of the the object = ?

Solution:

Kinetic energy is the energy due to a moving body.

So;

mathematically;

K.E = $\frac{1}{2}$ x m v²

m is the mass

v is the velocity

K.E = $\frac{1}{2}$ x 4 x 5 = 10J

5 0

3 years ago

A ruby laser delivers a 16.0-ns pulse of 4.20-MW average power. If the photons have a wavelength of 694.3 nm, how many are conta

stepan [7]

Answer:

The value is $n = 2.347 *10^{17} \ photons$

Explanation:

From the question we are told that

The amount of power delivered is $P = 4.20 \ M W = 4.20 *10^{6} \ W$

The time taken is $t = 16.0ns = 16.0 *10^{-9} \ s$

The wavelength is $\lambda = 694.3 \ nm = 694.3 *10^{-9} \ m$

Generally the energy delivered is mathematically represented as

$E = P * t = \frac{n * h * c }{\lambda }$

Where $h$ is the Planck's constant with value $h = 6.262 *10^{-34} \ J \cdot s$

c is the speed of light with value $c = 3.0*10^{8} \ m/s$

So

$4.20 *10^{6} * 16*10^{-9}= \frac{n * 6.626 *10^{-34} * 3.0*10^{8} }{694.3 *10^{-9}}$

=> $n = 2.347 *10^{17} \ photons$

4 0

3 years ago

Which has a greater buoyant force on it, a 25.0 cm3 piece of wood floating with part of its volume above water or a 25.0 cm3 pie

kozerog [31]

Answer:

piece of submerged iron

Explanation:

The buoyant force is given by:

$B=\rho_L V_{sub} g$

where

$\rho_L$ is the density of the liquid (in this case, water)

$V_{sub}$ is the submerged part of the object

g is the acceleration due to gravity

In this problem, the liquid used in the two examples is the same, water, so $\rho_L$ is the same; and g is the same as well. Therefore, the only difference between the two examples is $V_{sub}$ .

For the piece of wood, we are told that the object is floating, so only a fraction of its total volume of 25.0 cm3 will be submerged: therefore the submerged volume will be less than 25.0 cm3. On the contrary, the problem tells us that the piece of iron is submerged, so the submerged volume in this case is 25.0 cm3. Therefore, the submerged volume for the iron is greater than for the piece of wood, so the buoyant force of the piece of iron is greater.

8 0

3 years ago