How long does it take for light to travel 1m? and a 1mm?

Hello!

a) What is the change in momentum?

The change of the momentum is the velocity, because the velocity is reduced to zero.

We can calculate the aceleration, applicating the formula:

[tex]\boxed{a=\frac{V-Vi}{t} }[/tex]

Like you see, the final velocity will be zero, so:

[tex]a = \dfrac{0m/s-40m/s}{4s}[/tex]

[tex]a = \dfrac{-40m/s}{4s}[/tex]

[tex]a = -10\ m/s^{2}[/tex]

Like you see, the aceleration applicate by superman is of -10 m/s^2.

If the aceleration is negattive, means the velocity will decrease.

b.) What is the magnitud of the force wich superman exerts on the train?

For calculate the force applicate for superman, lets applicate the second law of Newton:

[tex]\boxed{F=ma}[/tex]

Lets replace and resolve it:

F = 8x10^3 kg * (-10 m/s^2)

F = 8000 kg * (-10 m/s^2)

F = -80 000 N

The force applicated is of -80000 Newtons.

When the force is negative means the force applicated in the another direction of the object what is traveling.

Answer:

Answer: Sound waves and some earthquake waves are longitudinal waves. Ocean, light and other earthquake waves are transverse waves.

Explanation:

There are 2 types of waves:

1. Longitudinal waves: These waves are defined as the waves in which the particles of the medium move in the direction of the wave. This requires a medium to travel. For Example: Sound Waves.

2. Transverse wave: These waves are defined as the waves in which the particles of the medium travel perpendicularly to the direction of the wave. This does not require a medium to travel. These can travel in vacuum also. For Example: Light waves.

Hence, Sound waves and some earthquake waves are longitudinal waves. Ocean, light and other earthquake waves are transverse waves

Answer:

Longitudinal, transverse.

Explanation:

The definitions:

Longitudinal wave: A type of wave that transfers energy parallel to the direction of wave motion.

Transverse wave: A type of wave that transfers energy perpendicular to the direction of wave motion.

Also:

Answer:

D

Explanation:

Answer:

The tadpole population would decrease.

Explanation:

A food web shows how organisms produce and depend upon each other for food. In an ecosystem, when the population of one organism changes, it can affect the population(s) of other organisms.

In this food web, tadpoles depend upon algae as a food source. If algae were removed from the ecosystem, then the population of tadpoles would likely decrease due to a lack of available food.

Answer:

0.5kg

Explanation:

Given parameters:

Potential energy = 147J

Height  = 30m

Unknown:

Mass of the bird  = ?

Solution:

Potential energy is the energy due to the position of a body. Now, the expression for finding the potential energy is given as;

      P.E  = mgH

m is the mass

g is the acceleration due to gravity = 9.8m/s²

H is the height

      147  = m x 9.8 x 30

         m = 0.5kg

Answer:

A

Explanation:

Answer:

It's C) color

Explanation:

--------

Answer:

The answer is C-Spin a magnet around the wire on the piece of iron. Hope that helps :)

Answer:

True

Explanation:

In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction. Such forces often cause one object to speed up (gain momentum) and the other object to slow down (lose momentum).

Answer:

The correct options are A and B

Explanation:

Personal beliefs can be described as beliefs that have not been scientifically proven. These beliefs are generally as a result of religion, culture or tradition. Scientifically in theory, these beliefs lack clear path of possibility. For example, being in possession of certain mineral crystals in order to help protect the body against illness have a little possibility of being scientifically (in theory) explained. There is also no scientific evidence to support this claim.

There is also no scientific evidence to support the idea of the constellation's position to predict  events in a person's life. This also has little possibility of being theoretically explained in science.

It should however be noted that there are exceptions/coincidences that suggest these events happen as it has been listed in the two options.

Answer: A and B!

Explanation: Just took the quiz.

Answer:

Pretty sure its -4.8%

Explanation:

Others asked this question and got this as an answer.

Answer:

C. –4.8 m/s

Explanation:

I just took the exam.

Answer:

the floor is clean and the soap is dirty. lol

Explanation:

this is too though bro do it by ur self

Answer:

1

Explanation:

Answer:

2.45 x 10^-2

Explanation:

All numbers in scientific notation or standard form are written in the form

m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.

To convert 0.0245 into scientific notation, follow these steps:

Step 1) Move the decimal 2 times to right in the number so that the resulting number, m = 2.45, is greater than or equal to 1 but less than 10

Step 2) Since we moved the decimal to the right the exponent n is negative

n = -2

Step 3) Write in the scientific notation form m × 10n

= 2.45 × 10-2

Therefore,

2.45 × 10-2 is the scientific notation form of 0.0245 number and 2.45e-2 is the scientific e-notation form for 0.0245

Here are some examples of decimal to scientific notation calculator

Answer:

[tex]h' = \dfrac{5}{7}h[/tex]

Explanation:

To find how far will the smooth side will the marble go in the upper direction, measured vertically from the bottom (leave your answer in terms of h)?

From the given information:

The potential energy for the marble starting at rest is:

PE = m*g*h

In the bottom of the bowl; the marble exhibit a linear and rotational K.E

[tex]K.E_{total} = K.E _{linear} + K.E _{rot}[/tex]

[tex]K.E_{total} = \dfrac{1}{2}mv^2+I\omega^2[/tex]

[tex]K.E_{total} = \dfrac{1}{2}mv^2+ \dfrac{1}{2}( \dfrac{2}{5}mR^2) ( \dfrac{v}{R})^2[/tex]

[tex]K.E_{total} = \dfrac{1}{2}mv^2+ \dfrac{1}{5}mv^2[/tex]

[tex]K.E_{total} = (\dfrac{5+2}{10})mv^2[/tex]

[tex]K.E_{total} = \dfrac{7}{10}mv^2[/tex]

By applying Conservation of energy, The Total Energy occurring in the marble when it started at rest is the same as the total energy when it gets to the midpoint in the bowl.

i.e.

[tex]P.E = K.E_{total}[/tex]

[tex]mgh = \dfrac{7}{10 }mv^2[/tex]

10 × mgh= 7mv²

making v² the subject of the formula, we get:

[tex]v^2 = \dfrac{10}{7 }gh[/tex]

Let us remember that the rotational K.E occurring at the midpoint of the bowl is still unchanged at the time the marble is moving to the left side.

Thus, by applying the Conservation of energy balance:

The linear K.E at the midpoint = The P.E of the marble

∴

[tex]\dfrac{1}{2}mv^2 = mgh'[/tex]

Making h' the subject, we get:

mv² = 2mgh'

Divide both sides by m

v² = 2gh'

Recall that [tex]v^2 = \dfrac{10}{7 }gh[/tex]

[tex]\dfrac{10}{7} gh = 2gh'[/tex]

10 gh = 14 gh'

Divide both sides by 2g

5h = 7h'

[tex]h' = \dfrac{5}{7}h[/tex]

Answer:

REALLY??

Explanation:

Volleyball was invented in 1905.

Answer:

what is this???

I don't know these kind of language exist...

Answer:

Assess what information you are given. Use this method if you know:

the total distance covered by one person or vehicle; and

the total time it took that person or vehicle to cover the distance.

Explanation:

Hope this helps! I might be wrong, so tell me if I am

Answer:

Average speed can be calculated by dividing the total distance the object travels by the total amount of time it takes to travel that distance.

Explanation:

This is as much as I can help you, i don't know much else on how to do that ;w; sorry

Answer:

3.5

Explanation:

The answer should be 3.5

Answer:

3.5

Explanation:

Answer:

Measuring potential difference Potential difference is measured using a device called a . Just like ammeters, some types have a pointer on a dial, but most have a digital display. However, unlike an ammeter, you must connect the voltmeter in parallel to measure the potential difference across a component in a circuit.

Answer:

I think it's b

Explanation:

........

Answer:

0.014s

Explanation:

Given parameters:

Mass of the ball  = 0.058kg

Force  = 260N

Velocity of the ball  = 63m/s

Unknown:

Time of contact  = ?

Solution:

To solve this problem, we apply Newton's second law of motion which is mathematically expressed as;

    Ft  = m(v - u)

F is the force

t is time

m is the mass

v is the final velocity

u is the initial velocity = 0m/s

   Insert the parameters and find t;

      260 x t  = 0.058(63 - 0)

       260t  = 3.65

            t = 0.014s

Answer:

-5

Explanation:

-15/3

Answer:

It's the same........

Answer:

They both the same weight

Answer:

There is a difference in air pressure.

Explanation:

I hope this helps you, BTW I got this right when I did the test

The given point is the separation between hot and cold current as a result of difference in air pressure.

A convection current is a type of heat transfer that occurs from the movement of hot air and cold air due to difference in air pressure.

The upward arrow shows hot air rising up due to its low density.

The downward arrow shows cold moving downwards to replace the risen hot air due to its high density.

Thus, the difference in air pressure between the hot air and cold air is causes convection current.

Learn more about convection current here: https://brainly.com/question/20295382

Answer:

31.15%

Explanation:

The formula used was

((Work output)/(Work input))×100

Answer:

C.  31.1 percent