3 years ago

What are electromagnetic waves and how do they travel?

1 answer:

5 0

Answer:

Propagation of an Electromagnetic Wave. Electromagnetic waves are waves which can travel through the vacuum of outer space. Mechanical waves, unlike electromagnetic waves, require the presence of a material medium in order to transport their energy from one location to another.

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A 3.50-meter length of wire with a cross-sectional area of 3.14 × 10-6 meter2 is at 20° Celsius. If the wire has a resistance of

maks197457 [2]

Answer:

$5.6\times 10^{-8}\ Ohm.m$

Explanation:

Resistivity is given by $\rho=\frac {AR}{L}$ where A is cross-sectional area, R is resistance, L is the length and $\rho$ is the reistivity. Substituting 0.0625 for R, 3.14 × 10-6 for A and 3.5 m for L then the resistivity is equivalent to

$\rho=\frac {3.14\times 10^{-6}\times 0.0625}{3.5}=5.60714285714285714285714285714285714285\times 10^{-8}\approx 5.6\times 10^{-8}\ Ohm.m$

8 0

4 years ago

A roller-coaster car moves 172 ft horizontally and then rises 115 ft at an angle of 31.0° above the horizontal. it next travels

lianna [129]

172 + 115 cos 31 +115 cos 48 horizontally

115 sin 31 - 115 sin 48 vertically

possibly need some drawing

4 0

3 years ago

Josh is much bigger than taylor. after the push, which of the two is moving faster?

egoroff_w [7]

If E = 1/2 * m * v^2
v = (2E/m)^1/2
so the larger the mass, the higher the velocity hence taylor is moving faster

6 0

3 years ago

If a 5 kg cart is pulled with a net force of 20 Newtons. What is the magnitude, in m/s2, of the acceleration?

Radda [10]

Answer:

F=ma

a=F/m=20/5=4 m/s^2

4 0

4 years ago

Blue light has a shorter wavelength than yellow light. Which color has the higher frequency. O Blue O Yellow O They have the sam

GarryVolchara [31]

Answer:

Blue light has the higher frequency.

Explanation:

Remember that the relation between wavelength and frequency for any electromagnetic wave in the vacuum is

$f = \frac{c}{\lambda}$

where $c$ is the speed of light in the vacuum. As you can see, the relation between frequency and wavelength is inversely proportional. The higher is the wavelength, the lower is the frequency.

5 0

4 years ago