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Nikitich [7]
3 years ago
5

PLEASE HELP!!! Will give brainliest!

Physics
2 answers:
Contact [7]3 years ago
8 0

The answer is B, Both can be characterized by amplitude, frequency, and wavelength. the speed of both is affected by the medium through which it travels.


Natali5045456 [20]3 years ago
3 0

The correct answer to the question will be B) Both can be characterized by amplitude, frequency, and wavelength. The speed of both is affected by the medium through which it travels.

EXPLANATION:

Light is an electromagnetic wave which is transverse in nature. It contains both the electric field and magnetic field which are perpendicular to each other as well as perpendicular to the direction of propagation.

We know that a transverse wave is characterized by its amplitude, frequency and wavelength . Here, crests and troughs are created which give the idea about the wavelength . The distance between two successive crests or troughs is called wavelength.

A sound wave is a longitudinal wave which moves in the form of compressions and rarefactions. Compressions are the high pressure zones while rarefactions are the low pressure zones in the wave. Here, the distance between two successive compresions or rarefactions is called wavelength of the wave. It is also characterized by frequency and amplitude.

The speed of light is medium dependent . It is more in optically rarer medium while less in optically denser medium . The light does not  require any medium for its propagation. It may propagate through space where it has the maximum velocity.

The speed of sound is also medium dependent . It depends on the density and elasticity of the medium.It can not travel through vacuum. It needs a medium for its propagation.

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Pavel [41]
It can either be all of them or just 1 and 3
4 0
3 years ago
The great lakes in north american hold about what percent of earth's fresh surface water?
fenix001 [56]
The answer is 20 percent
8 0
3 years ago
A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collisi
ra1l [238]

Explanation:

Momentum = mass × speed

p = (30 kg) (3 m/s)

p = 90 kg m/s

7 0
3 years ago
An automobile starter motor has an equivalent resistance of 0.0510 Ω and is supplied by a 12.0 V battery with a 0.0090 Ω interna
Alisiya [41]

Answer:

a) 200A

b) 10.2V

c) 2.04kW

d)

I=80A

V=4.08V

P=0.326kW

Explanation:

Here we have a circuit of one power source and two resistors in series, the first question is asking for the current, so according to Ohm's Law:

I=\frac{V}{R}

Where R is the equivalent resistance of the resistors in series

R=0.0510+0.0090=0.0600[ohm]

I=\frac{12.0}{0.0600}=200A

To calculate the voltage dropped by the motor we have to apply the voltage divider rule:

V_m=V*\frac{R_m}{R_m+R_s}\\V_m=12.0*\frac{0.0510}{0.0600}\\V_m=10.2V

The power dissipated supplied to the motor is given by:

P=I^2*R_m\\P=(200)^2*0.0510=2.04kW

now solving adding a 0.0900 ohm resistor:

I=\frac{12.0}{0.15}=80A

V_m=12.0*\frac{0.0510}{0.15}\\V_m=4.08V

P=I^2*R_m\\P=(200)^2*0.0510=0.326kW

5 0
3 years ago
A bicycle rider has a speed of 19.0 m/s at a height of 55.0 m above sea level when he begins coasting down hill. The mass of the
lukranit [14]

Answer:

The mechanical energy of the rider at any height will be 6.34 × 10⁴ J.

Explanation:

Hi there!

The mechanical energy of the rider is calculated as the sum of the gravitational potential energy plus the kinetic energy. Since there are no dissipative forces (like friction), the mechanical energy of the rider at a height of 55.0 m above the sea level will be the same at a height of 25.0 m (or at any height), because the loss in potential energy will be compensated by a gain in kinetic energy, according to the law of conservation of energy.

Then, calculating the potential and kinetic energy at 55.0 m and 19 m/s, we can obtain the mechanical energy that will be constant:

Mechanical energy = PE + KE

Where:

PE = potential energy.

KE = kinetic energy.

The potential energy is calculated as follows:

PE = m · g · h

Where:

m = mass of the object.

g = acceleration due to gravity.

h = height.

Then, the potential energy of the rider will be:

PE = 88.0 kg · 9.81 m/s² · 55.0 m = 4.75 × 10⁴ J

The kinetic energy is calculated as follows:

KE = 1/2 · m · v²

Where "m" is the mass of the object and "v" its velocity. Then:

KE = 1/2 · 88.0 kg · (19.0 m/s)²

KE = 1.59 × 10⁴ J

The mechanical energy of the rider will be:

Mechanical energy = PE + KE = 4.75 × 10⁴ J + 1.59 × 10⁴ J = 6.34 × 10⁴ J

This mechanical energy is constant because when the rider coast down the hill, its potential energy is being converted into kinetic energy, so that the sum of potential energy plus kinetic energy remains constant.

5 0
3 years ago
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