Which type of waves from the electromagnetic spectrum are used in heat lamps and heat sensing devices? visible light
ultraviolet rays
radio waves
infrared waves

Answers

Answer 1

Answer: Infrared waves are used in heat lamps and other heat sensing devices. Infrared waves or commonly known as Infrared radiations (IR) is the type of electromagnetic radiation we encounter most in our everyday life. Heat lamps are electrical devices which emit infrared radiation.

Answer 2

Answer:

Final answer:

Infrared waves from the electromagnetic spectrum are used in heat lamps and heat sensing devices, as they can penetrate and heat objects more deeply and are also emitted by objects based on their temperature.

Explanation:

The type of waves from the electromagnetic spectrum that are used in heat lamps and heat sensing devices are infrared waves.

These waves are invisible to the human eye but are detectable as heat. Infrared waves have longer wavelengths than visible light, which enables them to penetrate and heat objects more deeply.

For instance, a heat lamp emits infrared radiation that can warm up the objects it shines upon, while heat sensing devices, like thermal cameras, detect the infrared radiation emitted by objects based on their temperature.

Learn more about Infrared waves
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If the absolute pressure of a gas is 550.280 kPa, its gage pressure is A. 101.325 kPa.B. 651.605 kPa.C. 277.280 kPa.D. 448.955 kPa.
Which describes the relationship between potential and kinetic energy of a ball thrown up in the air as it falls back to the ground? A. Gravitational potential energy increases; kinetic energy increases. B. Kinetic energy equals gravitational potential energy. C. Kinetic energy increases; gravitational potential energy decreases. D. The mass of the ball is required to answer this.

A ball is projected horizontally from the top of a 92.0-meter high cliff with an initial speed of 19.8 m/s. Determine: (a) the horizontal displacement and (b) the final speed the instant prior to hitting the ground.

Answers

Answer:

Part a)

$d = 85.8 m$

Part b)

$v = 46.8 m/s$

Explanation:

Part a)

As we know that ball is projected horizontally

so here the vertical speed of the ball is zero

now we have

$y = (1)/(2)gt^2$

now we have

$92 = (1)/(2)(9.8)t^2$

$t = 4.33 s$

now in the same time the horizontal distance covered by the ball

$d = v_x t$

$d = 19.8 * 4.33$

$d = 85.8 m$

Part b)

now the horizontal speed of the ball always remains constant

so we have

$v_x = 19.8 m/s$

now in vertical direction we have

$v_y = v_0 + at$

$v_y = 0 + 9.8(4.33)$

$v_y = 42.4 m/s$

so the final speed of the ball is given as

$v = √(v_y^2 + v_x^2)$

$v = √(42.4^2 + 19.8^2)$

$v = 46.8 m/s$

The ball has two independent motions; the vertical motion and the horizontal motion.
That is the ball is falling vertically downwards from the cliff and the same time the ball is moving horizontally forward from the cliff.
Note: Initial Vertical Speed is = 0, Initial Horizontal Speed = 19.8 m/s
For the vertical motion: the initial velocity is zero. That is $u_(y)$ = 0.
S = ( $u_(y)$ )t + (1/2)gt^2. where g = acceleration due to gravity = 10 m/s^2
S = Vertical height = 92m
Substituting $u_(y)$ = 0, and S = 92m, g = 10m/s^2
92 = 0*t + (1/2)*10*t^2
92 = (1/2)*10*t^2
92 = 5t^2
5t^2 = 92
t^2 = 92/5
t^2 = 18.4 Take square root of both sides
t = $√(18.4)$
t = 4.29 seconds, that is the time to reach the ground. Time is same both for horizontal and vertical motion

a) Horizontal Displacement, which is Range R = Horizontal Speed * time
R = $u_(x)$ * time
R = 19.8 * 4.29 = 84.942 m.

b) Final Speed before hitting the ground.
Remember we realized that speed was in two parts: Vertical Speed and Horizontal Speed.
Just before hitting the ground Horizontal speed is same = 19.8 m/s, this is the same as the initial horizontal projected speed. (No acceleration in Horizontal direction so this remains the same)
Just before hitting the ground, $v_(y) = u_(y) + gt$
At projection Vertical speed is initially zero  $u_(y) = 0$
$v_(y) = 0 + 10*4.29$
Time is same both for horizontal and vertical motion
$v_(y)$ = 42.9 m/s
The velocity just before hitting the ground is 19.8 m/s in the horizontal direction and 42.9 m/s in the vertical direction.
These two are at right angles to each other. Therefore the resultant is:
= $\sqrt{19.8^(2)+ 42.9^(2) }$
= 47.25 m/s.
This is the resultant velocity just before it hits the ground.

In a generator, mechanical energy is converted into which of the following? A.an electromagnet

B.a moving rod

C.a magnetic field

D.electrical energy

Answers

In an electrical generator, you use steam, water, wind, or
bicycle pedals to turn the shaft, and electricity comes out.

Mechanical energy in ===> electrical energy out.

Answer:

eletrical ENERGY

Explanation:

Which of the following bodies has a brightness that surpasses Venus’? My options are Jupiter, Mars, the stars, and the Moon. Jupiter and mars are obviously out and Venus is brighter than all the stars in the sky (besides the sun lol) so it would be the moon right? just a lil confused.

btw i'm not sure what subject to post this in since there's no astronomy subject.

Answers

Answer: the Moon.

Explanation:

Brightness of celestial object is given in terms of magnitude. Apparent magnitude reflects how bright an object appears from the Earth. The apparent magnitude of the Moon is (-12.7 )greater than the apparent magnitude of the Venus (-4.4). The more negative value, the brighter is the object. Thus, the brightness of the moon surpasses the brightness of Venus.

Hi there!

The answer would be the stars. Since the sun is a star, the star is the answer. A star is much, much hotter than Venus, making it much brighter.

Hope this helps!

Is it true or false that wave interference only occurs with transverse waves?

Answers

i am not 100% sure but i think it is true.

Which of these statements is true? A.
Some molecules may contain no atoms.

B.
Some elements found in nature exist as molecules.

C.
Some compounds include only one type of element.

D.
Some atoms are made of two or more different elements.

Answers

B). Some elements found in nature exist as molecules.
That is, their atoms travel around in bound pairs.
Examples are Hydrogen, Oxygen, and Nitrogen.

A). No. Without atoms, you can't make a molecule.

C). No. A compound is a chemical combination of two or more elements.

D). No. An atom is the smallest unit of ONE single element.

Hello, your answer is, C. Some compounds include only one type of element.

I hope it helped!

What function does a generator perform inside a power plant?A.The generator stores electrical energy for later use in homes and businesses.

B.The generator transforms the mechanical energy of the turbine into electrical energy.

C.The generator spins the turbine to create mechanical energy.

D.The generator spins the turbine to create electrical energy.

Answers

The generator is called a 'generator' because it 'generates' something
that wasn't there before.

The power plant uses water, steam, or wind, to spin a turbine, and
the generator transforms the mechanical energy of the turbine into
electrical energy (which wasn't there before). (Choice-B)

B. The generator transforms the mechanical energy of the turbine into electrical energy.

Note that a generator uses mechanical energy to turn the wire loop in the magnetic field. This causes electric current to flow, creating electrical energy.

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