The magnitude of the magnetic field generated by an electromagnet is:.

Answer:

255 [m].

Explanation:

1) the formula is (d - requred distance, V₀ - initial velocity, t - elapsed time, a - deceleration):

[tex]d=V_0t+\frac{at^2}{2};[/tex]

2) according to the formula above the required distance is:

d=10*30-0.5*0.1*900=300-45=255 [m].

Apply second equation of kinematics

[tex]\\ \tt\longmapsto s=ut+\dfrac{1}{2}at^2[/tex]

[tex]\\ \tt\longmapsto s=10(30)+\dfrac{1}{2}(-0.1)(30)^2[/tex]

[tex]\\ \tt\longmapsto s=300+(-0.1)(450)[/tex]

[tex]\\ \tt\longmapsto s=300-45[/tex]

[tex]\\ \tt\longmapsto s=255m[/tex]

Answer:

The answer is A

Explanation:

When a rockets thrusters push on the ground the ground pushes back on the rocket with equal force in the opposite direction. Hence the rocket takes off.

Newtons third law of motion states, for every action there is an equal and opposite reaction.

Answer:

1. as initial speed is 0 and acceleration is g=9.8 m/s^2 velocity at any time

2. 15m

3. gravity and force

4. the flower pot would break from impact

Explanation:

Using the clues in the photo and reading the questions this should be the best answer. Good Luck!

Answer:

40

as it goes up 2second

20+20=40

Answer:

0.3J

Explanation:

pe = mgh  = 0.006 x 10 x 5 = 0.3j

Answer:

10800

Explanation:

if someone runs 720 miles every minutes they will run 10,800 miles in 15 minutes

As the train blows its whistle towards you, the wavelength is shorter than the sound of the whistle at rest.

Wavelength is the distance traveled by a wave in a given period of time.

Relationship between wavelength, speed and frequency of sound

v = fλ

where;

As the frequency of the sound increases, the wavelength of the sound decreases.

Thus, as the train blows its whistle towards you, the wavelength is shorter than the sound of the whistle at rest.

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Question:Where do most astronomers think the solar system formed from?.

Answer: Most Astronomers think the solar system formed from a Nebula

Answer:

False

Explanation: not even light can escape through the event horizon from the black hole. At its center, each black hole is thought to have a singularity, a point of infinite density, and zero volume.

Answer:

-34.3m/s

Explanation:

first lets find the time befor it hit the ground by using free fall equation and we know we use that in one condition which is a constant acceleration in this case its a gravitational acceleration which is -9.8

[tex]h = \frac{1}{2} g {t}^{2} [/tex]

[tex]t = \sqrt{ \frac{2 \times 60}{9.8 } } = 3.5s[/tex]

now we know that the initial velocity its zero :

so applu the another kinematic equation which is

[tex]v = u - gt[/tex]

v is final velocity and u is the initial velocity and its equal zero.

v = - 9.8 × 3.5 = - 34.3

[tex]\huge\sf\red{A}\pink{N}\orange{S}\green{W}\blue{E}\gray{R}[/tex]

Given,

mass of the ball, m=2 kg ;

height of the ball, h=60 m

The initial potential energy of the ball,

[tex]{\boxed{\underline{\sf{E_{p}=m g h=(2)(10)(60)=1200 \mathrm{~J}}}}[/tex]

When the ball reaches the ground, its potential energy becomes zero as it is entirely converted into its kinetic energy ( [tex]{\sf{E_{K}[/tex] ), i.e.,

[tex]{\Rightarrow{\sf{E}_{\sf{k}}=1200 \mathrm{~J}}}[/tex]

If v is the velocity attained by the ball just before reaching the ground,

[tex]{\Rightarrow{\sf{E}_{\sf{k}}=\frac{1}{2}{mv}^{2}}}}[/tex]

[tex]{\sf\Rightarrow{v=\sqrt{\frac{2 \sf{E}_{\sf{k}}}{\sf{m}}}=\sqrt{\frac{2 \times 1200}{2}}}[/tex]

[tex]{\Large{\mid{\underline{\overline{\Rightarrow{\sf{34.64\:m/s}}}}\:{\mid}[/tex]

Answer:

d

Explanation:

Fnet=m*a

algebra to rework = a = Fnet/m

so the force of the hand is divided by the mass of the object

The maximum height of the ball if A ball is launched at 5.5 m/s at 76 degrees above the horizontal is 1.45 meters.

Distance, regardless of the direction of the travel, is the entire path that an object in motion has taken. Since the direction of motion is ignored while measuring distance, it is referred to as a scalar quantity. There is only one possible value for the distance: positive.

Given:

A ball is launched at 5.5 m/s at 76 degrees above the horizontal, It starts and lands at the same distance from the ground,

Calculate the maximum height as shown below,

Maximum height = [tex]v^2sin^2a / 2g[/tex]

Maximum height = 5.5² × sin²76° / 2 × 9.8

Maximum height = 30.25 × 0.97² / 19.6

Maximum height = 30.25 × 0.9409 / 19.6

Maximum height = 28.46 / 19.6

Maximum height = 1.45 m

Thus, the maximum height is 1.45 meters.

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Answer:

A

Explanation:

what more to say.. :| it's the distance from x to a crest or trough

Answer:

The answer is A

Explanation:

The amplitude of wave is the distance the wave moves in one second

Answer:

important – mass, and distance.

You are able to perceive it as a single strand because of the principle of : Good continuation

Principle of Good continuation states that objects with very smooth edges are easily seen as been continuous ( i.e as a single strand ) rather than objects or materials with rough edges.

The rope coiled on a beach has very smooth edges therefore can be seen as a continuous strand and this is possible due to the principle of good continuation.

Hence we can conclude that You are able to perceive it as a single strand because of the principle of : Good continuation.

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Answer:

You need to look up the figure for the energy released in the formation of one He atom, and then multiply that by the number of He atoms formed each second, and the result will be the total energy release that you seek.

Explanation:

Answer:

it is an example of a translucent object

Answer:

Net force required to accelerate the car is 6000 N

Explanation:

Force is calculated by the equation, F = Mass × Acceleration

This is based on Newton's Second Law of Motion which states that the force acting on an object is its mass times the acceleration of the object.

Here, mass = 3000 kg and acceleration = 2 m/s²

⇒ Force = Mass × Acceleration

             = 3000 × 2 = 6000 N

⇒ F = 6000 N

⇒ M = 3000 kg

⇒ a = 2 m/s²

Answer:

c.15

FA = Leffort / Llifting

[tex] \frac{30}{2} [/tex]

=15

Answer:

B is directed from N to S     (upwards at the open end)

Let the magnet be oriented with the open end at the north

F = q * v X B

A positive charge would be deflected towards the East using v X B

This is the direction of the "conventional" current which is B to A

Actual charges flow from A to B but the sign of the charge is -q

[tex] \tt \: SOLUTION \leadsto[/tex]

It is dangerous to move towards the top of the branches of a tree because The exposed wood tissues begin to decay or either are too dilute. Due to which the branch can break and we can fall Down.

Answer:

Explanation:

It is dangerous to move towards the top of a tree because as we will move towards the top the branch gets thinner and thinner and we can fall down because of the breaking of the branch.

Answer:

140km/hr

Explanation:

This is a simple converstion.

We know that the bus travels 350km/150min.

We want to know the speed in km/h. All we need to know is that per 1 hr there are 60 min.

350km/150min * 60min/1hr  (we want to make sure that the value we are trying to eliminate, in this case the minute, is on the opposing side.)

(350*60)/150 = 21,000km/150hr

let's simplify to only per 1 hr.

21000/150 = 140

150/150 = 1

Therefore, the speed of the bus is 140km/hr

A bus travels a total of 350 km in 150 minutes, so the average speed of the bus in km/hr will be 140 km/hr.

The object's average speed is how far it travels overall in a predetermined amount of time. The scalar quantity represents the average speed. It has no direction; instead, magnitude is used to describe it.

Average Speed =  [tex]Total \ Distance/Total\ time[/tex]

An indicator of a vector is average velocity. Average velocity is calculated by dividing the change in position or displacement by the intervals during which it occurs. The average velocity may be positive or negative depending on how the displacement is dispersed. The standard international unit of average velocity is meters per second (m/s).

Average Velocity = [tex]Total \ Displacement/Total \ Time[/tex]

According to the question, the given values are :

Distance, d = 350 km

Time, t = 150 minutes or

t = 2.5 hours.

Average Speed = 350/2.5

Average speed = 140 km/hr

Hence, the average speed of the bus will be 140 km/hr.

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Answer:

The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. Sound waves that are closer together have a higher frequency, and sound waves that are farther apart have a lower frequency.

Explanation:

hope it helps you

Answer:

Explanation:

As it moves along, the paper is given a strong negative electrical charge by another corona wire. When the paper moves near the drum, its negative charge attracts the positively charged toner particles away from the drum.

The surface of the paper in the printer has a negative charge.

A laser printer is a common form of computer printer that uses quasi photocopier technology.  A color laser printer is up to ten times more costly than a monochrome laser printer.

The steps in which the laser printer work is;

1. When a document is transmitted to the printer, a laser beam uses electrical charges to "draw" the document on a selenium-coated drum.

2. After the drum has been charged, it is rolled in toner, a sort of dry powder ink. The charged picture on the drum is adhered to by the toner.

3. The toner is applied to a piece of paper and fused to it using heat and pressure.

4. After the document has been printed, the electrical charge on the drum is released and the surplus toner is collected.

Hence the surface of the paper in the printer has a negative charge

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Answer:

local group

Explanation:

Earth is in the second largest galaxy of the Local Group - a galaxy called the Milky Way. The Milky Way is a large spiral galaxy. Earth is located in one of the spiral arms of the Milky Way (called the Orion Arm) which lies about two-thirds of the way out from the center of the Galaxy.

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The location of the earth in the milky way galaxy is local group.

Milky way is the largest galaxy in the universe. It consists of large group of stars along with interstellar gases, dust, or dark matter.

Earth is occupying the second largest place in galaxy of the Local Group. Earth is one of the spiral arms of the Milky Way.

Thus, location of the earth in the milky way galaxy is local group.

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If the rod is in rotational equilibrium, then the net torques acting on it is zero:

∑ τ = 0

Let's give the system a counterclockwise orientation, so that forces that would cause the rod to rotate counterclockwise act in the positive direction. Compute the magnitudes of each torque:

• at the left end,

τ = + (50 N) (2.0 m) = 100 N•m

• at the right end,

τ = - (200 N) (5.0 m) = - 1000 N•m

• at a point a distance d to the right of the pivot point,

τ = + (300 N) d

Then

∑ τ = 100 N•m - 1000 N•m + (300 N) d = 0

⇒   (300 N) d = 1100 N•m

⇒   d ≈ 3.7 m