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3 years ago

When you look at a white light through a glass prism, you see a rainbow of colors called a

Physics

1 answer:

arlik [135]3 years ago

4 0

It should be called a spectrum, but there may be different answers that your teacher may use

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How much time will it take a 75w ceiling fan to convert 1500j of electrical energy into mechanical and thermal energy?

-Dominant- [34]

20h

Explanation:

Given parameters:

Electrical power = 75W

Electrical energy = 1500J

Unknown:

Time taken = ?

Solution:

Electrical power is the amount of voltage that drives current.

P = IV

Electrical energy is the voltage that drives a current per unit of time

E = IVt

E = Pt

Since time is the unknown, we can make it subject of the formula;

t = $\frac{E }{P}$ = $\frac{1500}{75}$ = 20h

Learn more:

Invention of electrical power brainly.com/question/13146914

#learnwithBrainly

4 0

3 years ago

At what distance above the surface of the earth is the gravitational field 4.9 m/s^2

san4es73 [151]

That's 1/2 of what it is on the surface.

The distance between the center of the Earth and any object
on the surface is 1 Earth radius ... about 3960 miles.

Gravitational force is inversely proportional to the square of
the distance between the centers of the objects, so in order
to reduce the acceleration of gravity by 1/2, you increase the
distance by √2 .

   (3960 miles) x (√2) = 5,600 miles from the center

   = 1,640 miles above the surface.

5 0

4 years ago

Pls can someone help

xz_007 [3.2K]

Answer:

ITS THE LAST ONE(4TH), I THINK

Explanation:

5 0

3 years ago

Read 2 more answers

A warehouse worker is pushing a 90.0-kg crate with a horizontal force of 282 N at a speed of v = 0.850 m/s across the warehouse

Elanso [62]

Answer:

$v_{f} = 0.51 \frac{m}{s}$

Explanation:

We apply Newton's second law at the crate :

∑F = m*a (Formula 1)

∑F : algebraic sum of the forces in Newton (N)

m : mass in kilograms (kg)

a : acceleration in meters over second square (m/s²)

Data:

m=90kg : crate mass

F= 282 N

μk =0.351 :coefficient of kinetic friction

g = 9.8 m/s² : acceleration due to gravity

Crate weight (W)

W= m*g

W= 90kg*9.8 m/s²

W= 882 N

Friction force : Ff

Ff= μk*N Formula (2)

μk: coefficient of kinetic friction

N : Normal force (N)

Problem development

We apply the formula (1)

∑Fy = m*ay , ay=0

N-W = 0

N = W

N = 882 N

We replace the data in the formula (2)

Ff= μk*N = 0.351* 882 N

Ff= 309.58 N

We apply the formula (1) in x direction:

∑Fx = m*ax , ax=0

282 N - 309.58 N = 90*a

a= (282 N - 309.58 N ) / (90)

a= - 0.306 m/s²

Kinematics of the crate

Because the crate moves with uniformly accelerated movement we apply the following formula :

vf²=v₀²+2*a*d Formula (3)

Where:

d:displacement in meters (m)

v₀: initial speed in m/s

vf: final speed in m/s

a: acceleration in m/s²

Data

v₀ = 0.850 m/s

d = 0.75 m

a= - 0.306 m/s²

We replace the data in the formula (3)

vf²=(0.850)²+(2)( - 0.306 )(0.75 )

$v_{f} = \sqrt{(0.850)^{2} +(2)( - 0.306 )(0.75 )}$

$v_{f} = 0.51 \frac{m}{s}$

8 0

3 years ago

Would you hear an echo if you shouted in your bedroom? Explain your answer.

Sindrei [870]

Answer:

if your bedroom is empty yes but if not most likely no

Explanation:

Why Cannot we hear an echo in a small room?

They can't hear an echo in small room because in it the sound can't be reflected back. For an echo of a sound to be heard,the minimum distance between the source of sound and the walls of the room should be 17.2 m.Obviously,in a small room echoes cannot be heard.

8 0

4 years ago

Read 2 more answers