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3 years ago

15

Why is tungsten used as a filament in a bulb?

1 answer:

Viktor [21]3 years ago

7 0

Answer:

because of tungsten's high melting point

Explanation:

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Which term describes the light-sensitive structures found on the retina?

miss Akunina [59]

The answer would be
C. Rods and Cones

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3 years ago

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How do the wavelengths of electromagnetic energy absorbed by materials on earth compare?

Dmitrij [34]

Explanation:

The shorter wavelength electromagnetic waves from sun are absorbed by earth material in form of short wavelength and the radiated wavelength are longer ones. Also higher energy waves are of shorter wavelength and lower energy waves have longer wavelength. So, they are absorbed as short wavelength and radiated back as long wavelength.

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3 years ago

Explain the law of conservation of energy in your own words .

melamori03 [73]

The law of conservation of energy states that in any reaction, energy cannot be created or destroyed.

In other words, energy has to be conserved in every reaction.

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3 years ago

A man who works for a moving company is loading a box onto a moving van. He pushes a 200N box up a 5m long ramp. If he pushes wi

OlgaM077 [116]

Answer:

η = 0.667 = 66.7%

Explanation:

The efficiency of the man can be given by the following formula:

η = output/input

where,

η = efficiency of man = ?

output = potential energy gain of the box = Wh

input = work done by man = Fd

Therefore,

$\eta = \frac{Wh}{Fd}$

where,

W = weight of box = 200 N

h = height gained by box = 1 m

F = force exerted by man = 60 N

d = length of ramp = 5 m

Therefore,

$\eta = \frac{(200\ N)(1\ m)}{(60\ N)(5\ m)}$

<u>η = 0.667 = 66.7%</u>

8 0

3 years ago

It is common to see birds of prey rising upward on thermals. The paths they take may be spiral-like. You can model the spiral mo

bezimeni [28]

Radius of circle of spiral path = 6 m

Time period = 5 s

So the total length of the path = $2 \pi R$

$distance = 2 \pi R$

$distance = 2 \pi *6$

$distance = 12\pi$

time taken by bird to cover the distance = 5 s

so the speed of the bird = distance / time

$v = \frac{distance}{time}$

$v = \frac{12\pi}{5}$

$v = 7.54 m/s$

so the tangential speed in horizontal direction = 7.54 m/s

vertical velocity by which it is rising upwards = 3 m/s

so the angle with the horizontal for net speed is given as

$\theta = tan^{-1}\frac{v_y}{v_x}$

$\theta = tan^{-1}\frac{3}{7.54}$

$\theta = 21.7 degree$

so velocity vector will make 21.7 degree with the horizontal

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3 years ago