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3 years ago

Plz Help

Physics

2 answers:

Olenka [21]3 years ago

8 0

Answer:

Explanation:

Kinetic energy is the energy from movement so whenever its moving the most / longest is your answer

alexandr402 [8]3 years ago

5 0

Answer:

d just before it hits the ground

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(1 pt) this problem is an example of critically damped harmonic motion. a hollow steel ball weighing 4 pounds is suspended from

Zepler [3.9K]

<span>Answer: Hooke's Law along with Newtons second Law of motion. x"+(a/m)x'+(k/m)x=F(t)/m x"+(256)x'+(96)x=0 F=-kx F=-4 x=1/3 mg=4 m=4/32 m=1/8 -4=-k* (1/3) k=12 x"+(256)x'+(96)x=0 y=C1e^(4*(1018)^(1/2)-128)*t+C2e^(-4*(...</span>

3 0

3 years ago

the velocity of sound in a certain medium is 1000 m/s. If sound wave has a frequency of 500 Hz, the wavelength would be _.

nignag [31]

Answer:2meter

Explanation:

Velocity=1000m/s

Frequency=500Hz

wavelength=velocity ➗ frequency

Wavelength=1000 ➗ 500

Wavelength=2meter

5 0

3 years ago

A box with mass 25.14 kg is sliding at rest from the top of the slope with height 13.30 m

lutik1710 [3]

Answer:

Explanation:

The first thing we are asked to find is the Force experienced by the box. That is found in the formula:

F - f = ma where F is the force exerted by the box, f is the friction opposing the box, m is the mass, and a is the acceleration (NOT the same as the pull of gravity). But F can be rewritten in terms of the angle of inclination also:

$wsin\theta-f=ma$ where w is the weight of the box. We will use this version of the formula because it will help us answer the second question, which is to solve for a. Filling in:

First we need the weight of the box. Having the mass, we find the weight:

w = mg so

w = 25.14(10) so

w = 251.4 N (I am not paying any attention at all to the sig fig's here, since I noticed no one on this site does!) Now we have the weight. Filling that in:

251.4sin(30) - f = ma Before we go on to fill in for f, let's answer the first question. F = 251.4sin(30) so

F = 125.7 And in order to answer what a is equal to, we find f:

f = μ $F_n$ where Fn is the weight of the object.

f = .25(251.4) so

f = 62.85. Filling everything in now altogether to solve for a, the only missing value:

125.7 - 62.85 = 25.14a and

62.85 = 25.14a so

a = 2.5 m/s/s

Now we have to move on to another set of equations to answer the last part. The last part involves the y-dimension. In this dimension, what we know is that

a = -10 m/s/s

v₀ = 0 (it starts from rest)

Δx = -13.30 m (negative because the box falls this fr below the point fro which it started). Putting all that together in the equation for displacement:

Δx = v₀t + $\frac{1}{2}at^2$ and we are solving for time:

$-13.30=0t+\frac{1}{2}(-10)t^2$ and

$t=\sqrt{\frac{2(-13.30)}{-10} }$ so

t = 1.6 seconds to reach the bottom of the slope from 13.30 m high.

3 0

3 years ago

What are three properties of electromagnetic waves?

Zolol [24]

The three properties of electromagnetic waves are; they travel at the speed of light, they include ultraviolet waves, and they can transfer energy through empty space.

<h2>Further Explanation</h2><h3>A wave</h3>

A wave is a transmission of a disturbance. It involves transmission of energy from one point which is the source to another point.
Waves may be classified depending on the need for a transmission medium or based on the vibration of particles relative to the direction of wave motion.
Waves may be either transverse or longitudinal based on the direction of wave motion relative to the vibration of particles
Additionally waves may be classified as either electromagnetic wave or mechanical based on the need for a transmission medium.

<h3>Electromagnetic waves </h3>

Electromagnetic waves are types of waves that do not require a material medium for transmission.
All waves of the electromagnetic spectrum are electromagnetic transverse waves that do not require a material medium for transmission.
They include; radio waves, microwaves, infrared, visible light, ultra-violet, x-rays, and gamma rays.
All waves of the electromagnetic spectrum travel with a speed of light, 3.0 x10^8 m/s.
Additionally, electromagnetic waves possess energy that is given by; E = hf; where h is the plank's constant and f is the frequency.

keywords: Wave, electromagnetic wave, electromagnetic spectrum

<h2>Learn more about: </h2>

Waves: brainly.com/question/5354733
Electromagnetic waves: brainly.com/question/5354733
Electromagnetic spectrum: brainly.com/question/5354733
Velocity, speed and wavelength: brainly.com/question/11898955

Level: High school

Subject: Physics

Topic: Electromagnetic spectrum

Sub-topic: Properties of an electromagnetic waves

5 0

4 years ago

Read 2 more answers

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary

Assoli18 [71]

Answer:

The tension in the cable when the craft was being lowered to the seafloor is 4700 N.

Explanation:

Given that,

When the craft was stationary, the tension in the cable was 6500 N.

When the craft was lowered or raised at a steady rate, the motion through the water added an 1800 N.

The drag force of 1800 N will act in the upward direction. As it was lowered or raised at a steady rate, so its acceleration is 0. As a result, net force is 0. So,

T + F = W

Here, T is tension

F = 1800 N

W = 6500 N

Tension becomes :

$T=W-F\\\\T=6500-1800\\\\T=4700\ N$

So, the tension in the cable when the craft was being lowered to the seafloor is 4700 N.

7 0

3 years ago