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son4ous [18]
3 years ago
9

A 50 kg child is sitting on a scale on the floor of an elevator. The elevator starts at rest and accelerates down at a rate of a

=−1 m/s2.Calculate the velocity of the elevator after 3 seconds.
Physics
1 answer:
morpeh [17]3 years ago
3 0

Answer:

v=m/s m=v.s -1*3= -3 meter/second

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What is the longest wavelength that can be observed in the third order for a transmission grating having 5200 slits/cm?
Anarel [89]

Answer:

641 nm.

Explanation:

Given that,

A transmission grating has 5200 slits/cm.

We need to find the longest wavelength that can be observed in the third order. Using grating equation as follows :

d\sin\theta=m\lambda ...(1)

d is slit spacing

No fo slit per unit length :

N={5200}\ slit/cm\\\\=520000\ slits/m

We know that, N = 1/d

For longest wavelength, θ = 90°

From equation (1)

\dfrac{\sin\theta}{m\lambda}=\dfrac{1}{d}\\\\520000=\dfrac{\sin(90)}{3\lambda}\\\\\lambda=\dfrac{1}{520000\times 3}\\\\=6.41\times 10^{-7}\ m\\\\=641\ nm

Hence, the longest wavelength in third order for a transmission grating is 641 nm.

3 0
3 years ago
Which description best explains why the view within the rectangle lens is different than the view outside the lens?
Viktor [21]

Answer:

A) Light waves are restricted to a single plane through the lens.

Explanation:

Took the quiz and got it right

8 0
3 years ago
"What will the pressure inside the container become if the piston is moved to the 1.60 L mark while the temperature of the gas i
asambeis [7]

This question is incomplete, the complete question is;

The Figure shows a container that is sealed at the top by a moveable piston, Inside the container is an ideal gas at 1.00 atm. 20.0°C and 1.00 L.

"What will the pressure inside the container become if the piston is moved to the 1.60 L mark while the temperature of the gas is kept constant?"

Answer:

the pressure inside the container become 0.625 atm if the piston is moved to the 1.60 L mark while the temperature of the gas is kept constant

Explanation:

Given that;

P₁ = 1.00 atm

P₂ = ?

V₁ = 1 L

V₂ = 1.60 L

the temperature of the gas is kept constant

we know that;

P₁V₁ = P₂V₂

so we substitute

1 × 1 = P₂ × 1.60

P₂ = 1 / 1.60

P₂ = 0.625 atm

Therefore the pressure inside the container become 0.625 atm if the piston is moved to the 1.60 L mark while the temperature of the gas is kept constant

5 0
3 years ago
Why does a plane move even when the wind is pushing against it?
boyakko [2]
A plane has more mass in it. Also, the engine is very strong which it makes the plane able to push through the wind. When the wind is pushing, it goes by it because of the engine.
3 0
3 years ago
Read 2 more answers
The energy an object has because of its position is called _____
Alenkinab [10]

Answer:

Gravitational potential energy

Explanation:

The gravitational potential energy is the energy that an object has because of its positive with respect to a certain reference level (generally assumed to be the ground level).

The magnitude of the gravitational potential energy is given by

U=mgh

where

m is the mass of the object

g is the strenght of the gravitational field

h is the height of the object with respect to the reference level

From the formula, we see that the higher the object is, the larger its gravitational potential energy is.

5 0
3 years ago
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