A wave travels at 18 m/s and has a wavelength of 3 meters. What is the frequency of the wave?

Answer:

90%

Explanation:

if you lose 10% of a 100 you get 90

Answer:

heat energy

Explanation:

Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer.

Answer:

See below

Explanation:

Vertical position = 45 +  20 sin (30) t  - 4.9 t^2

 when it hits ground this = 0

               0 = -4.9t^2 + 20 sin (30 ) t + 45

                0 = -4.9t^2 + 10 t +45 = 0     solve for t =4.22 sec

  max height is at  t= - b/2a = 10/9.8 =1.02

     use this value of 't' in the equation to calculate max height = 50.1 m

      it has  4.22 - 1.02 to free fall = 3.2 seconds free fall

           v = at = 9.81 * 3.2 = 31.39 m/s VERTICAL

      it will also still have horizontal velocity =  20 cos 30 = 17.32 m/s

        total velocity will be sqrt ( 31.39^2 + 17.32^2) = 35.85 m/s

Horizontal range = 20 cos 30  * t  =  20 *  cos 30  * 4.22 = 73.1 m

The image as shown here can here can be used to describe charging by induction.

A charge may be positive or negative. One of the methods of transferring a charge is by induction.

In this case, an objects induces an opposite charge on a material.  The image as shown here can here can be used to describe charging by induction.

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Answer:

friction

Explanation:

Answer:

discovered as obisdan

Explanation:

me ginus brooo

Answer:

4 m/s

Explanation:

v=u+ at  and  v^2=u^2+2as.

It is given that  v=0,t=5  s    and  s=10  m.

⇒0=u+5a  and  0=u^2+20a.

⇒a=−u/5  and  a=−u^2/20.

⇒u/5 = u^2/20⇒u=4  m/s.

⇒  The initial velocity is  4  m/s.

The mass of the accelerated object is 9kg.

According to this law, the force is equal to the product of mass of the object and its acceleration.

F =ma

Given is the force F =45 N and the acceleration is 5 m/s², then the mass will be

m = F/a

m = 45/5

m =9kg

Thus, the mass of the object is 9kg.

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Answer: D. A bobcat fights a wolf to protect younger bobcats.

Answer:

1)10 m/s

2) 20 m/s

3) 2 s

4) 500 m

5)1000 km/h

Average speed = distance travelled / time.

( note: distance must be in (m) and time in sec, if not then you convert ).

1) average speed = 20/2 = 10mls.

2) average speed = 100/5 = 20 m/s.

3) since we aren't given (time) let's call it x

so we replace the unknown time with x..

average speed = 2/x = 1

then cross multiply

you get x (the unknown time) as 2s {seconds}.

(to check if it's correct just add the time we got back into the equation and see if you would get a erage speed as 1m/s).

4) do the same, replace distance as x or any letter you want )

average speed = x/ 10 = 50

cross multiply

you get x = 500m {meters}

5) (we need to convert km to meters and time to secs because that's what we are working with).

200km = 200,000 m { to convert to meters you multiply the given by 1000, 1km = 1000m).

for 2h, we know that:

60 seconds makes 1 minute

60 minutes makes an hour.

so we multiply 60 by 60 we get 3600mins then we multiply it by 2 to get 7200 secs

so now

Average speed = 200,000/7200 = 27.77 m/s.

Here you go..

hope this helps

Good luck and ace that test.

The option that can be expressed in light years is " the distance between two stars." The correct option is B.

A light-year is a unit of distance used to measure astronomical distances. It is defined as the distance that light travels in one Earth year in the vacuum of space, which is approximately 9.46 trillion kilometers (5.88 trillion miles). Light travels at a speed of about 299,792,458 meters per second (or approximately 186,282 miles per second), which means that in one year, light can cover a distance of 9.46 trillion kilometers. Light years are commonly used to measure the distance between stars and galaxies, and since space is vast, other units of distance are often not practical.

Here in the Question,

A] The age of a rock is a measure of time, usually in millions or billions of years, and cannot be expressed in light years, which is a unit of distance.

C] The speed at which the Earth revolves around the sun is measured in kilometers per second or miles per hour and represents a velocity, not a distance. Hence it cannot be expressed in light years.

D] The time it takes for Earth to complete a revolution around the sun is measured in days or years and is again a measure of time, not distance. So it cannot be expressed in light years.

Therefore, Only B The distance between two stars is a measure of distance, which can be expressed in light years since it is a vast distance and other units may not be suitable.

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You should keep your eyes on the road and shift into neutral when gas pedal gets jammed.

In automobiles, shifting into neutral won't transmit power to the wheels and the direction of the steering wheel can still be controlled.

This helps to prevent accidents on the road as a result of such malfunctions in the car.

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The the amount of the original gold-198 that remains after 5.4 days is one-quarter.

Half-life is the time required or taken for half the amount of matter present in a given substance to vanish or decay.

The half-life of gold-198 is 2.7 days.

After, 5.4 days, the gold would have undergone two half-lives.

The amount of matter remaining = 1/2 * 1/2 = 1/4

Therefore, the amount of the original gold-198 that remains is one-quarter.

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Power is the energy per unit time required to run a machine. The output power of the motor is 2590 W.

Power is the product of force and velocity with which an object is moving.

P = F x v

Given is the force 450N and the velocity is 5.675 m/s, then the power is

P = 450 x 5.75

P = 2587.5 Watt

The power output of the motor is approximately 2590 W.

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Answer:

2.13 x 10^-5

Explanation:

light travels at 3.00 x 10^8 m/s

it's like if someone asks how long would it take for a car to go 100 miles if it's traveling 50 miles per hour

you would do

100 ÷ 50

6.4 x 10^3 ÷ 3.00 x 10^8

2.13 x 10^-5

Answer:

Blue light has the shortest wavelength amongst all the colours that combine to make white light. This means the blue light diffracts (bends) the most out of all of them. There will be no dispersion of colours because ideally, the blue light must consist of only one frequency.

Refer to the attachments

Note that

Like charges attract each other and unlike charges repel each other

Answer:

Distance: 32 km

Displacement: 18 km

Explanation:

Distance is the total amount travelled. Displacement on the other hand is how far away an object is from its starting point.

Distance is a scalar quantity meaning it only has magnitude. Displacement is a vector quantity meaning it has magnitude and direction.

Distance is represented by "x" while displacement is represented as "Δx".

Note that "Δ" is the Greek letter "delta" which is used to represent a change in something.

Let's start by finding the distance.

Since distance is the total amount travelled, we can just add all of the values.

9km + 18km + 5km = 32 km

Then, we can find the displacement.

North and East are positive while South and West are negative.

If the athlete ran 9km East and 5km West, their displacement would be:

9km - 5km = 4km East

Now, we can set up a triangle to determine the displacement from the starting point.

18km North would be the longer leg, 4km East would be the shorter leg, and the displacement would be the hypotenuse.

Using Pythagorean's Theorem we find that:

[tex]a^2+b^2=c^2\\4^2+18^2=c^2\\16+324=c^2\\340=c^2\\c\approx18[/tex]

Note that "a" and "b" represent the legs of the triangle while "c" represents the hypotenuse of the triangle.

The displacement is approximately 18m.

Answer:

0.12m/s

Explanation:

v=λf

Given that, λ = 12cm = 0.12m

T = 1second

(A period T is the time required for one complete cycle of vibration to pass a given point)

frequency 'f' is unknown but we can get frequency from f = 1/T = 1/1 = 1Hz

therefore, v= 0.12 × 1 = 0.12m/s

Answer: True

Explanation:

A scalar quantity is those quantities that only have magnitude and no direction. Therefore the value doesn't change with direction.

Answer:

false .....................

Answer:

The answer is A. White Dwarf

Explanation:

Answer:

wrapping around the wire around iron core several times

Explanation:

adding more turns to the coil. increasing the current flowing through the coil.

Answer:26.7 and 7.4

Explanation:

So, first you add all the time up then the area travelled.

Firstly; 45 mins + 300 minutes(5 hours) + 165 minutes(2.75 minutes)= 510 minutes

Secondly; 42.2KM + 180.5KM + 3.86KM= 226.56KM

Finally: For hourly you would do: 510 divided by 60 to get 510 mins in terms of hours: so, 8.5 hours then you would do 226.56KM divided by 8.5 hours to get: 26.7Km/hr

For m/s: 7.4m/s

The markdown price for a mountain bike is $584.35

Markdown price is the discount offered by the shopkeepers to the customers to increase the sales rate.

M.P = S.P (1-r/100)

The following expression can be used every time we have to find the markdown price.

Substitute Selling price S.P =$899 and the percent r =35/100 =0.35, we get

M.P = $899(1-0.35)

M.P =$584.35

Thus, the markdown price is $584.35

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A net forward force as well as gravitational force pulls the marble downwards whereas frictional force slows it down.

A force is an agent which causes a change in the motion or state of an object.

Forces are of two types:

Andrew applies force on the marble causing it to move.

When Andrew pokes the marble, he gives it net forward force. As the marble rolls down the ramp, gravitational force pulls it down.

The movement of the marble is slowed down by frictional force from the ramp.

Therefore, a combination of applied force and gravitational force moves the marble forward, while frictional force slows it down.

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Answer:

Applied, Gravitational, and Frictional.

Explanation

hope it helps :)

The increase in temperature that will result if 225.0 g of copper absorbs 5000 J of heat energy is 57.72°C.

The temperature change of a substance can be calculated using the following formula:

Q = m × c × ∆T

Where;

5000 = 225 × 0.385 × ∆T

5000 = 86.63∆T

∆T = 5000/86.63

∆T = 57.72°C

Therefore, the increase in temperature that will result if 225.0 g of copper absorbs 5000 J of heat energy is 57.72°C.

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Answer:

2.76 eV

Explanation:

The Quanta of Light For example, a photon of blue light of wavelength 450 nm will always have 2.76 eV of energy.

Answer:

True

Explanation:

Gas always live in free state but some gas is not . We can said that mostly gas volume can be changeable during disturbing by environment situation.

Volume?

Let's see

Volume:-