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2 years ago

You want to create a new warming appliance that is safe. Which type of electromagnetic wave would be most useful to investigate?

Physics

2 answers:

dexar [7]2 years ago

7 0

Answer:

-infrared waves

Explanation:

If electromagnetic waves are arranged in order of their energy in lowest to highest order then it is as following

1) Radio waves

2) Microwaves

3) Infrared waves

4) Visible light

5) Ultraviolet waves

6) X Rays

7) Gamma Rays

So here if we wish to use to create a safe device for warming which would be of lesser and safe energy

so here correct answer would be

Infrared waves

NARA [144]2 years ago

4 0

Infrared waves. The other 3 would hurt you because they are below the UV scale of 400 nanometers. Infrared is light that wouldn't harm you

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At 20°c, the resistance of a sample of nickel is 525 ohms. what is the resistance when the sample is heated to 70°C?

Ipatiy [6.2K]

The resistance of the sample is $682.5\Omega$

Explanation:

The relationship between resistance of a material and temperature is given by the equation

$R(T)=R_0(1+\alpha (T-T_0))$

where

$R_0$ is the resistance at the temperature $T_0$

$\alpha$ is the temperature coefficient of resistance

For the sample of nickel in this problem, we have:

$R_0 = 525 \Omega$ when the temperature is $T_0 = 20^{\circ}C$

While the temperature coefficient of resistance of nickel is

$\alpha = 0.006/^{\circ}C$

Therefore, the resistance of the sample when its temperature is

$T=70^{\circ}C$

$R=(525)(1+0.006(70-20))=682.5 \Omega$

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2 years ago

What unit is kinetic energy measured in?

mote1985 [20]

Centimetres correct yuh

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2 years ago

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Mass (kg)

Tju [1.3M]

Mass.

Because mass doesn't depend on weight but weight depends on mass.

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3 years ago

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What medical technique uses sound wave pulses and their reflections to map structures and organs inside the body?

garri49 [273]

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3 years ago

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When a 3.0 kg mass is hung from a vertical massless spring, the spring is stretched 40 cm. What is the spring constant of the sp

Dmitry_Shevchenko [17]

Answer:

0.74 N/cm

Explanation:

The following data were obtained from the question:

Mass (m) = 3 Kg

Extention (e) = 40 cm

Spring constant (K) =?

Next, we shall determine the force exerted on the spring.

This can be obtained as follow:

Mass (m) = 3 Kg

Acceleration due to gravity (g) = 9.8 m/s²

Force (F) =?

F = mg

F = 3 × 9.8

F = 29.4 N

Finally, we shall determine the spring constant of the spring. This can be obtained as follow:

Extention (e) = 40 cm

Force (F) = 29.4 N

Spring constant (K) =?

F = Ke

29.4 = K × 40

Divide both side by 40

K = 29.4 / 40

K = 0.74 N/cm

Therefore, the spring constant of the spring is 0.74 N/cm

5 0

2 years ago