The wavelength of a wave is 4 metre & its time period is 2 second. What is speed of the wave?

Answer:

-4 m/s^2

Explanation:

v=vo+at

0=40+a(10)

-40=a(10)

-4=a

Answer:

324 units

Explanation:

Given that,

Objects 1 and 2 attract each other with a gravitational force of 36.0 units.

The distance separating Objects 1 and 2 is changed to one-third the original value.

Let the new force be F' and r'=r/3. so,

[tex]F=\dfrac{kq_1q_2}{r^2}[/tex]

[tex]F'=\dfrac{kq_1q_2}{r'^2}\\\\F'=\dfrac{kq_1q_2}{(\dfrac{r}{3})^2}\\\\=9\times \dfrac{kq_1q_2}{r^2}\\\\=9F\\\\=9\times 36\\\\=324\ \text{units}[/tex]

So, the new force become 324 units.

Answer:

Work = 165670.4 J = 165.67 KJ

Explanation:

First, we will find the deceleration of the car, using the 3rd equation of motion:

[tex]2as = v_{f}^2 - v_{i}^2\\[/tex]

where,

a = deceleration = ?

s = skid distance = 40 m

vf = final speed = 0 m/s

vi = initial speed = 17.2 m/s

Therefore,

[tex]2a(40\ m) = (0\ m/s)^2 - (17.2\ m/s)^2\\a = - 3.698\ m/s^2[/tex]

the negative sign indicates deceleration here.

Now, we will calculate the braking force applied by the brakes on the car:

[tex]F = ma\\F = (1120\ kg)(-3.698\ m/s^2)\\F = - 4141.76\ N[/tex]

the negative sign indicates braking force.

Now, we will calculate the work done using the magnitude of this force:

[tex]Work = |F|s\\Work = (4141.76\ N)(40\ m)\\[/tex]

Work = 165670.4 J = 165.67 KJ

1g=1000kg

120*1000

=120000kg

120000kg*10N/kg

=1200000N

Answer:

---

Explanation:

Force is like the amount of push

Motion is the result of Push

Answer:

It should be light sensor...but if not, maybe device? machine?.

Answer:  X-ray

Explanation:

Im dum

Answer:

600 kg

Explanation:

Answer: 5.0025 * 10^-8 N

Explanation:

[tex]F = \frac{Gm_1m_2}{r^{2} }[/tex]

F = gravitational force

G (is a constant) = 6.67×[tex]10^{-11}[/tex] N(m/kg)^2

m1 = mass of first object = 500 kg

m2 = mass of second object = 600 kg

r = distance between them = 20 M

[tex]6.67*10^{-11}N(m/kg)^2* \frac{500 kg*600 kg}{(20m)^2}\\6.67*10^{-11}N*\frac{m^2}{kg^2} * \frac{300000kg^2}{400m^2}\\6.67*10^{-11} N * 750\\5002.5 * 10^{-11} N \\5.0025 * 10^{-8} N[/tex]

The work done  is the product of the force and resulted displacement. The frictional force between the box and floor is 119.5 N.

Force is external factor acting on a body to make a change in the state of an object . According to Newton's second law of motion, force is the product of mass and acceleration.

The work done in physics is the product of force acting on a body and its displacement. Therefore, the force which result in a displacement of the body is said to be work done on the object.

Here, the work done by frictional force is 550 J and displacement is 4.6 m.

Therefore, the force = work done / displacement

                                  = 550 J/ 4.6 m

                                  = 119.5 N.

Hence, the force between the floor and box will be 119.5 N.

To find more on frictional force, refer here:

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Answer:

164.87 J

Explanation:

From the question,

Work done (W) = mghcosθ........................ Equation 1

Where m = mass of the box, h = height, g = acceleration due to gravity, θ = angle to the vertical

Given: m = 25 kg, h = 2.6 meters, θ = 75°.

Constant: g = 9.8 m/s²

Substitute these value into equation 1

W = 25×9.8×2.6×cos75°

W = 164.87 J.

Answer:

The statement which best explains the difference between the light waves travelling through a vaccuum and light waves travelling through a medium  is -"When light waves travel through a vacuum, they travel faster than when they travel through a medium."

Explanation:

Light waves are faster in vacuum because The refractive index of vacuum is the lowest since there is no barrier in the way of light propagation in vacuum. Demonstrate that the maximum speed of light in vacuum.

In a vacuum, light flies at 186,283 mph. Light flies at 186,200 mph in the air, or 56 mph slower. In another medium, such as water, light travels at 139,712 mph, or around 3/4 of the speed of light in a vacuum.

LIGHT WAVES -: Light waves are a form of electromagnetic wave that includes both visible and invisible to the naked eye wavelengths on the electromagnetic spectrum. The average human eye can see light with wavelengths ranging from 390 to 700 nanometers, or nm.

Forms of light waves comprises of Radio waves , microwaves , infrared waves , visible light etc.

When light waves travel through a vaccume, they travel faster than when they travel through a medium

A light wave is an electromagnetic wave which travels through the vacuum of outer space. Light waves are produced by vibrating electric charges., An electromagnetic wave is a transverse wave which has both an electric and a magnetic component.

Light waves are faster in vaccum because the refractive index of vaccume is the lowest since there is no barrier in the maximum speed of light in vaccum.

In vaccum light travels at 186283 mph in air 186200 mph in other medium like water at 139712 mph.

Hence  light waves travel through a vaccum, they travel faster than when they travel through a medium

To know more about light waves follow

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Complete Question:

On a circular race track with a radius of 3.23 km, a certain road car set a speed record of 372 km/h. What was the car's centripetal acceleration?

Answer:

Centripetal acceleration = 3.306 m/s²

Explanation:

Given the following data;

Radius, r = 3.23 km to meters = 3.23 * 1000 = 3230 m

Velocity = 372 km/h to meters per seconds = 372*1000/3600 = 103.33 m/s

To find the centripetal acceleration;

Centripetal acceleration = velocity²/radius

Centripetal acceleration = 103.33²/3230

Centripetal acceleration = 10677.09/3230

Centripetal acceleration = 3.306 m/s²

Answer:

The correct answer is A volts on edge 2021

Explanation:

Answer:

The Principle of Progression

(I searched it up since I never learned this)

Explanation:

The principle of progression states that a person should start slowly and increase exercise gradually. Since Mandy is just getting started on her exercise routine, she should begin with a few workouts over a large span of time, then work her way up so she can do more workouts in a shorter span of time.

Answer:

A) speed up

is the correct option

Answer:

slows down

Explanation:

As the temperature difference decreases the rate of transfer slows (hope this helps)

Answer:

water

is missing in above equation

hope it helps

60km/hr..

I think so....

60 km/s

60 kilometers / 60 minutes

= 1 kilometer / minute

as we know to convert kilometer / min we should multiply 60 to speed value

therefore, (1×60/ 1) km/hr=60 km/ hr

if you want to know why 60 multiplied with it then read this

1 km/min to km/hr

1 minute = 1/60 hour

so, for converting minute to hour we multiply 1/60

when it goes to top then it multiplied

I know it's little complicated let see it by equation

1 km/min = (1 / 1×1/60) km/h

=(1 / 1/60) km/hr

= 60 km/hr

( note there is no change in km so it remains without multiplied)

Answer:

5.6mls

Explanation:

Answer:

x) KE and GPE

y) Only GPE

z) Only KE

Explanation:

From the diagram, we have;

1) At point X, the gall is at an elevation higher than the thrower, therefore, the ) ball has (gravitational) potential energy, GPE, because it can fall  to a lower level unassisted from the height it was thrown

And the ball is also in upward motion, with which it reaches the height 'Y', therefore, the ball has kinetic energy, KE, to move higher

2) At point 'Y' which is the maximum height, the ball no longer moves upwards and momentarily, the ball has no vertical motion, therefore, the ball has only energy due to height, which is the gravitational potential energy, GPE

3) At the point Z, at the instant just before the ball touches the ground, the elevation of the ball above the ground is small, while the velocity of the ball is close to maximum velocity, therefore, the ball has Only kinetic energy, KE

Answer: concentration c = 25.2 g /(41.99 g/mol × 0.75 l)

Explanation: M(NaF) = 41.99 g/mol and amount of substance n = m/M.

Concentration c = n/V

What is the molarity (concentration) of 25.2 grams of NaF dissolved in a total volume of 0.75 liters is 0.8 mol/liter.

What is Molarity ?

Molarity shows the concentration of solute in the given solution. It is defined as no. of moles of solute present in 1 liter of solution. It is denoted by M. its SI unit is mol/L.

Hence, molarity is given by,

Molarity = No. of moles of solute ÷ Volume of the solution in liters

Given,

mass of NaF = 25.2 g

Volume of the solution = 0.75 liters

Molarity = ?

Let's find No. of moles of the solute.

NaF has one Na and one F.

Molar mass of NaF is,

Na = 22.98*1 = 22.98

F = 18.99*1 = 18.99

Molar mass of NaF is 22.98+18.99= 41.97 g/mol

No. of moles of the solute is,

25.2g of NaF × (1÷41.97 ) mol/g = 0.6 mol.

Molarity of NaF is,

Molarity = No. of moles of solute ÷ Volume of the solution in liters

M = 0.6 mol ÷ 0.75 liters

M = 0.8 mol/liter

Hence molarity of NaF is 0.8 mol/liter.

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Answer:

a. Speed = 765 m/s

b. Wavelength = 0.0153 m

Explanation:

Given the following data;

Distance = 91.8m

Time = 120 milliseconds to seconds = 120/1000 = 0.12 seconds

Frequency = 50KHz = 50 * 10³ = 50000 Hz

a. To find the speed of sound in the ocean:

Speed = distance/time

Speed = 91.8/0.12

Speed = 765 m/s

b. To find the wavelength;

Wavelength = speed/frequency

Wavelength = 765/50000

Wavelength = 0.0153 m

Answer: Frequency of 1 ÷ 2 = 0.5 Hz.

Answer:

20 watts

Explanation:

Big brain mode activated:

Power=1200J/60sec

Power=20 watts

Answer:

Explanation:

For free body diagram see attached sheet .

W is weight of steel girder acting at the middle point of its length . T is tension in the cable .

OB = √ ( 12² - 2² )

= 11.83 m .

OC = 11.83 / 2 = 5.915 m

Taking moment of tension T and weight W about point O

W x OC = T x OB

22 x 5.915 = T x 11.83

T = 22 x 5.915 / 11.83

= 11 kN

Considering forces acting in vertical direction and equating forces in opposite direction

T + R = W

R = W - T

= 22 - 11 = 11 KN

So force of grinder on the ground = R

= 11 KN.

Answer:

Water pressure P=ρgh  (density X acceleration due to gravity X height of water)

                      P=1000X9.8x3=29,400 N/m2  or Pascal

But there is air pressure over water which also adds to the pressure at the bottom of the pool.

Therefore,Atmospheric pressure over the water=1.01 x 105 N/m2

So the total pressure on the bottom of the pool = 29,400+ 101000 Pa

                                                                    = 130,400 Pa

Explanation:

Answer:

They are gaining energy, can move and slide past each other.

Explanation:

Because as ice melts, the molocules gain energy/heat which warm them up and are able to slide/move apart from each other.

[tex]\huge\mathfrak\green{answer}[/tex]

As per as my knowledge

The speed of a wave in a medium is affected by density, wavelength and temperature :)

(Good luck on your test and mark me brainliest if this helps)

Answer:

Primero, sabemos que la densidad de el oro es:

Densidad =  19.3 g/cm^3

Sabemos que nuestro metal tiene una masa de 0.75 kg, y un volumen de 340 cm^3.

Primero deberíamos reescribir la masa en gramos, pues la densidad está escrita en gramos.

Sabemos que:

1 kg = 1000g

Entonces:

0.75 kg es 0.75 veces 1000g, esto nos da:

0.75kg = 0.75*(1000g) = 750g

Entonces tenemos:

masa = 750g

volumen = 340cm^3

Ahora debemos recordar que:

densidad = masa/volumen

Entonces la densidad de este metal es:

densidad = 750g/340cm^3 = 2.21 g/cm^3

Si la comparamos con la densidad del oro, podemos ver que esta es mayor.

Entonces podemos concluir que este metal no es oro.