The substances required to enable a rocket engine to fire are called:

If the length of a pendulum is doubled,what will be the change in its time period??

Phantasy [73]

Explanation:

see the attachment.. hope it will help you

6 0

3 years ago

In your research lab, a very thin, flat piece of glass with refractive index 1.20 and uniform thickness covers the opening of a

liraira [26]

Answer:

(a). The thickness of the glass is 868 nm.

(b). The wavelength is 3472 nm.

Explanation:

Given that,

Refractive index = 1.20

Wavelength = 496 nm

Next wavelength = 386 nm

We need to calculate the thickness of the glass

Using formula for constructive interference

$2nt=(m+\dfrac{1}{2})\lambda$

Put the value into the formula

In first case,

$2nt=(m+\dfrac{1}{2})496$ .....(I)

In second case,

$2nt=(m+1+\dfrac{1}{2})386$

$2nt=(m+\dfrac{3}{2})386$ .....(II)

From equation (I) and (II)

$(m+\dfrac{1}{2})496=(m+\dfrac{3}{2})386$

$110m=336$

$m=3.0$

Put the value of m in equation (I)

$2nt=(2+\dfrac{1}{2})496$

$t=\dfrac{(3+\dfrac{1}{2})496}{2\times1}$

$t=868\ nm$

The thickness of the glass is 868 nm.

(b). We need to calculate the wavelength

Using formula of constructive interference

$2nt=(m+\dfrac{1}{2})\lambda$

$\lambda=\dfrac{2nt}{(m+\dfrac{1}{2})}$

Put the value into the formula

$\lambda=\dfrac{2\times1\times868}{\dfrac{1}{2}}$

$\lambda=3472\ nm$

Hence, (a). The thickness of the glass is 868 nm.

(b). The wavelength is 3472 nm.

8 0

4 years ago

A cart loaded with bricks has a total mass of 22.2 kg and is pulled at constant speed by a rope. The rope is inclined at 27.5 ◦

musickatia [10]

Answer:

W = 1.432 KJ

Explanation:

given,

mass = 22.2 Kg

angle of the rope = 27.5°

distance on the ground = 24 m

kinetic friction= μ = 0.32

acceleration due to gravity, g = 9.8 m/s²

Work done = ?

W = F d cosθ

a = 0 because it is moving with constant speed

equating all the forces acting in x direction

F cosθ = F friction = μN

equating all the forces acting in y direction

F sinθ + N -mg =0

now,

N = mg - F sinθ

putting value of N

F cosθ = μ mg -μ F sinθ

F (cosθ + μsinθ ) = μ mg

$F = \dfrac{\mu mg}{cos\theta + \mu sin\theta}$

$F = \dfrac{0.32 \times 22.2 \times 9.8}{cos 27.5^0+0.32 \times sin27.5^0}$

F =67.28 N

now,

W=F d cosθ

W =67.28 x 24 x cos(27.5)

W =1432.27 J

W = 1.432 KJ

7 0

3 years ago

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Three cars, car x, car y, and car z, begin accelerating from rest, at the same time. car x is more massive than car y, which is

grigory [225]

When the net force exerted on each car is identical. after 10 seconds, the amount of momentum is same for all cars.

<h3>What is impulse?</h3>

The change in momentum is equal to the product of impact force applied while colliding and time for that impact.

F. t = m (Vf -Vi)

where, Vf is the final velocity and Vi is the initial velocity.

For car X, Fx x t = Mx Vx

For car Y, Fy x t = My Vy

For car Z, Fz x t = Mz Vz

The force applied is same for all and the the time is also same equal to 10 seconds. The impulse is same for all the cars.

Thus, the three cars have same momentum.

Learn more about impulse.

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6 0

2 years ago

In which item is energy stored in the form of gravitational potential energy

lara31 [8.8K]

Stretched bow string

7 0

3 years ago

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