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4 years ago

HURRY!!!!!!!!!!

Physics

1 answer:

aleksklad [387]4 years ago

8 0

Answer:

Explanation:

snak fissil is not danger to soil during is the fact because it polluted the air

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A glass plate (n = 1.60) is covered with a thin, uniform layer of oil (n = 1.29). A light beam of variable wavelength from air i

frez [133]

Answer:

The thickness of the oil film is 198 nm.

Explanation:

Given that,

Refractive index of glass plate = 1.60

Refractive index of oil = 1.29

Wavelength = 511 nm

We need to calculate the thickness of the oil film

Using formula of path difference

$2nt=k\lambda$

$t=\dfrac{k\times\lambda}{2n}$

Where, n = refractive index

t = thickness

$\lambda$ = wavelength

Put the value into the formula

$t=\dfrac{1\times511\times10^{-9}}{2\times1.29}$

$t=198\times10^{-9}\ m$

$t= 198\ nm$

Hence, The thickness of the oil film is 198 nm.

7 0

4 years ago

A ball is thrown horizontally from the top of a building and strikes the sidewalk after 2.8 s. How tall is the building? Neglect

Brut [27]

Answer:

h = 38.41 m

Explanation:

Given that,

A ball is thrown horizontally from the top of a building and strikes the sidewalk after 2.8 s.

We need to find the height of the building. Let it is h.

Initial speed of the ball, u = 0

Using second equation of motion to find h as follows :

$h=ut+\dfrac{1}{2}at^2\\\\\text{Put u = 0 and a = g}\\\\h=\dfrac{1}{2}gt^2\\\\=\dfrac{1}{2}\times 9.8\times 2.8^2\\\\=38.41\ m$

So, the building is 38.41 m tall.

3 0

3 years ago

If you had to choose one device to use with the battery, what would it be? Do you think such a battery could be invented

maw [93]

Answer:

a phone because it has longer lasting battery

Explanation:

6 0

3 years ago

Read 2 more answers

A team of eight dogs pulls a sled with waxed wood runners on wet snow (mush!). The dogs have average masses of 19.0 kg, and the

liberstina [14]

Answer

given,

number of dog = 8

mass of each dog= 19 Kg

mass of sled = 210 Kg

average force = 185 Nss

a) writing all the horizontal force

force acting by dog - friction force = (M + 8m) a

8 F_d - μ m g = (M + 8m) a

assuming coefficient of friction of snow be μ = 0.14

8 x 185 - 0.14 x 210 x 9.8 = (210 + 8 x 19 ) x a

a = 3.29 m/s²

b) the kinetic friction of coefficient is less than static friction

hence, we can suggest that acceleration of the sled will increase once the sled start to move.

a > 3.29 m/s²

8 0

3 years ago

A diver comes off a board with arms straight up and legs straight down, giving her a moment of inertia about her rotation axis o

mihalych1998 [28]

Answer:

θ₁ = 0.5 revolution

Explanation:

We will use the conservation of angular momentum as follows:

$L_1=L_2\\I_1\omega_1=I_2\omega_2$

where,

I₁ = initial moment of inertia = 18 kg.m²

I₂ = Final moment of inertia = 3.6 kg.m²

ω₁ = initial angular velocity = ?

ω₂ = Final Angular velocity = $\frac{\theta_2}{t_2} = \frac{2\ rev}{1.2\ s}$ = 1.67 rev/s

Therefore,

$(18\ kg.m^2)\omega_1 = (3.6\ kg.m^2)(1.67\ rev/s)\\\\\omega_1 = \frac{(3.6\ kg.m^2)(1.67\ rev/s)}{(18\ kg.m^2)}\\\\\omega_1 = \frac{\theta_1}{t_1} = 0.333\ rev/s\\\\\theta_1 = (0.333\ rev/s)t_1$

where,

θ₁ = revolutions if she had not tucked at all = ?

t₁ = time = 1.5 s

Therefore,

$\theta_1 = (0.333\ rev/s)(1.5\ s)\\$

<u>θ₁ = 0.5 revolution</u>

4 0

3 years ago