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Rashid [163]
3 years ago
13

What radiation do remote controls use?

Physics
1 answer:
aleksandr82 [10.1K]3 years ago
5 0

Answer:infrared radiation

Explanation:

Most remote control uses infrared radiation

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A 120 V fish-tank heater is rated at 130W. Calculate (a) the current through the heater when it is operating, and (b) its resist
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Explanation:

The power P dissipated by a heater is defined as

P = VI

where V is the voltage and I is the current.

a) The current running through a 130-W heater is

I = \dfrac{P}{V} = \dfrac{130\:\text{W}}{120\:\text{V}} = 1.08\:\text{A}

b) The resistance <em>R</em><em> </em>of the heater is

P = VI = (IR)I = I^2R

where V= IR is our familiar Ohm's Law.

\Rightarrow R = \dfrac{P}{I^2} = \dfrac{130\:\text{W}}{(1.08\:\text{A})^2}

R = 110.8\:Ω

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3 years ago
Which material would result in the greatest amount of energy transfer? An absorber that is dark in color and rough. A reflector
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Answer:

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Explanation:

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3 years ago
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A car has an initial velocity of 10m/s. It accelerates at a rate of 2m/s2 until it reaches 30m/s. How far does it travel and for
Anna [14]

Answer:

acceleration=(v final-vinitial)/time

a=(vf-vi)/t

2=(30-10)/t

2=20/t

t=20/2=10 seconds

distance=v0t+at²/2

d=10 x 10+ 2x 10²/2=100+100= 200 m

Explanation:

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2 years ago
A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports
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Two flat conductors are placed with their inner faces separated by 17 mm. If the surface charge density on one of the inner face
blagie [28]

Answer:

Explanation:

electric field between plates

=  surface charge density / ε₀

= 108 x 10⁻¹² / 8.85 x 10⁻¹² (ε₀ = 8.85 x 10⁻¹² )

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Electric potential diff

= electric field x distance between plates

=  12.20 x 17 x 10⁻³ V

= 0.207 Volt

4 0
4 years ago
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