ANYONE KNOW NUMBER 1?

Answer:

He needs to enroll himself in CMMA. This company help young students obtain a well future in Construction Science.

Answer:8.2N

Explanation:I did the quiz on k12 and that’s the answer i got :)

Answer:

The value of acceleration due to gravity is greater in terai than in mountain. In terai region the radius of earth is less as it lies close to the centre of the earth. Thus, the value of g is more in terai region.

Answer:

Must be aimed to the left

Explanation:

Coriolis effect deflects wind or any moving item which has no contact with earth and has substantial distance to cover and moving at a substantial altitude. Coriolis effect deflectd the object to the right in the northern hemisphere. Therefore, missile must be aimed to the left, to nullify the coriollis effect.

Answer:

13950kg

Explanation:

If we make the system both railroad cars, we know that the momentum of the whole system doesn't change because the forces are internal.

Let a be the mass of the second car.

The original momentum is 9300*15 kg*m/s+ a*0 kg*m/s = 139500 kg*m/s

After sticking together, the momentum is (9300+a)kg*6m/s, which should be equal to 139500 kg*m/s

Therefore (9300+a)*6 = 139500

9300+a = 23250

a = 13950 kg

The net force parallel to the plane is

∑ F = m g sin(29°) = m a

where

m = mass of the block

g = magnitude of the acceleration due to gravity, 9.8 m/s²

a = mag. of acceleration of the block

where we take the direction of the block's sliding down the plane to be positive. Then

a = g sin(29°) ≈ 4.8 m/s²

Explanation:

The terms involved in S = ut + 1/2at²

S = displacement

u = initial velocity

a = acceleration

t = time.

Hope it will help :)

Answer:

the distance traveled or displacement (s) of an object using its initial velocity (u), acceleration (a), and time (t) traveled.

Answer:

D the difference between two pressures​

Explanation:

A manometer is a device used to measure the difference between the pressure in a place. Manometer is solely used to determine gas pressure.

Answer:

Explanation:

Answer:

5.1 x 10¹⁰s

Explanation:

Given parameters:

Decay constant  = 13.6 x 10⁻¹²/s

Unknown:

Half life of the element  = ?

Solution:

From the decay constant, we can find the half-life of this radioactive element.

  Half-life  = [tex]\frac{0.693}{decay constant}[/tex]  

     Half-life  = [tex]\frac{0.693}{13.6 x 10^{-12} }[/tex]   = 5.1 x 10¹⁰s

Answer:

I. Clockwise moment = 150 Nm

II. Anticlockwise moment = 400 Nm

III. 200 N

III. The anticlockwise moment.

Explanation:

From the question given above, we can obtain the answers to the questions as follow:

I. Determination of the clockwise moment.

Distance (d) = 1.5 m

Force (F) = 100 N

Clockwise Moment =?

Moment = Force × distance.

Clockwise moment = 100 × 1.5

Clockwise moment = 150 Nm

II. Determination of the anticlockwise moment.

Distance (d) = 2 m

Force (F) = 200 N

Anticlockwise Moment =?

Moment = Force × distance.

Anticlockwise moment = 200 × 2

Anticlockwise moment = 400 Nm

III. Determination of who will turn the sea saw.

Clockwise moment = 150 Nm

Anticlockwise moment = 400 Nm

Since the anticlockwise moment is greater than the clockwise moment, it therefore means that the anticlockwise moment will turn the sea saw.

Answer:

True

Explanation:

Electrons can be transferred between materials as in chemical reactions solid substances lose electrons while other elements gain electrons to balance the electrons in reaction.It occurs by conduction,polarization and friction.

Answer:

a) T=549.36N Upwards

b) T=448.56N Upwards

c) T=650.16N Upwards

Explanation:

The very first thing we can do to solve this problem is to draw a free body diagram we can use to analyze the situation (see attached picture).

On the diagram we can see there are only two forces acting on the object: the tension of the rope and the weight of the object itself.

a)

Since the object is moving at a constant speed, this means that its acceleration will be zero. So we can do a sum of forces like this:

[tex]\sum F=0[/tex]

T-W=0

T=W

T=mg

[tex]T=(56kg)(9.81m/s^{2})[/tex]

T=549.36N upwards

b)

For part b, since the object is accelerating downwards, we wil say that it's acceleration is negative, so [tex]a=-1.8m/s^{2}[/tex]

so we can do a sum of forces again:

[tex]\sum F=ma[/tex]

so

T-W=ma

T=ma +W

T=ma+mg

T=m(a+g)

and now we substitute:

[tex]T=(56kg)(-1.8 m/s^{2}+9.81 m/s^{2})[/tex]

which yields:

T=448.56N upwards (in this particular case, the tension always goes upwards)

c)

Since the object is moving upwards, we can say that its acceleration will be positive, so [tex]a =1.8m/s^{2}[/tex]

we can take the solved equation we got on the previous part of the problem, so we get:

T=m(a+g)

[tex]T =(56kg)(1.8 m/s^{2}+9.81 m/s^{2})[/tex]

which yields:

T=650.16N upwards

The tension force in the rope when the object moves upward at a constant velocity is 548.8 N.

The tension force in the rope when the object accelerates downward at a constant acceleration is 448 N.

The tension force in the rope when the object accelerates upward at a constant acceleration is 649.6 N.

The given parameters:

The tension force in the rope when the object moves upward at a constant velocity;

T = ma + mg

at constant velocity, a = 0

T = mg

T = 56(9.8)

T = 548.8 N

The tension force in the rope when the object accelerates downward at a constant acceleration of 1.8 m/s².

T = mg - ma

T = m(g - a)

T = 56(9.8 - 1.8)

T = 448 N

The tension force in the rope when the object accelerates upward at a constant acceleration of 1.8 m/s².

T = mg + ma

T = m(g + a)

T = 56(9.8 + 1.8)

T = 649.6 N

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Height,h= 20m

"gently dropped" means initial velocity, u, =0m/s

Uniform acceleration, g=10m/s²

using the formula v²=u²+2gs

Substituting, v²=0²+2*10*20

v²=400

v=

[tex] \sqrt{400} [/tex]

v=20m/s

Time, t at which is strike the ground

using the formula v=u+at

Substituting, 20=0+10t

20=10t

t=2s

This means that the bank strike the ground with a velocity of 20m/s in 2s.

Answer: The tile floor.

Explanation:

We can think of this as follows:

By the second Newton's law, we know that:

F = m*a

force is equal to mass times acceleration.

Now, as the egg hits the ground, we can think that there is a force that is applied in a very short period of time.

(similar to the case of a bat hitting a baseball)

Ok, the total energy of the impact will be the same for any surface in which the egg falls.

But suppose that the egg falls in a carpet, in this case, the carpet has a kinda large collision time (the time that the force is applied to the egg), this means that we will have a smaller force, acting for a long period of time. Now if the egg falls on something harder, like the tile floor, the collision time will be a lot shorter, then the force must be a lot stronger to compensate, this force is so large, that breaks the shell of the egg.

the tile floor is then the correct answer.

Answer:

W = 5.76 J

Explanation:

Given that,

Charge 1, [tex]q_1=12\times 10^{-6}\ C[/tex]

Charge 2, [tex]q_2=8\times 10^{-6}\ C[/tex]

The distance between charges is 10 cm.

Initial distance = 10 cm = 0.1 m

Final distance = 10 cm - 4 cm = 6 cm = 0.06 m

We need to find the work done in bringing the 4 cm together.

We know that,

Work done = change in kinetic energy

[tex]W=kq_1q_2(\dfrac{1}{r_2}-\dfrac{1}{r_1})\\\\\text{Put all the values}\\\\W=9\times 10^9\times 12\times 10^{-6}\times 8\times 10^{-6}(\dfrac{1}{0.06}-\dfrac{1}{0.1})\\\\W=5.76\ J[/tex]

So, the required work done is 5.76 J.

Answer:

a

Explanation:

Answer:

contact

Explanation:

A contact force is defined as a force which requires some contact to occur. When we apply force that is in contact with the objects are called as contact forces.

In the context, Carmen is loading furniture and boxes on a moving van by picking up by picking up the boxes or furniture on a cart and pushing it onto the van. Carmen uses contact forces to lift the boxes and furniture onto the van.

Answer:

The new force of attraction between the two objects will be remain the same.

The gravitational law states that the gravitation force is the ratio of the product of the masses and the square of the distance between them.

Let the masses be m and M and the distance between them is r. Then the force is given as,

F = GmM / r²

Suppose that two objects attract each other with a gravitational force of 16 units.

F = 16

GmM / r² = 16 units

If the mass of both objects was doubled, and if the distance between the objects was doubled. Then we have

F' = G(2m)*(2M) / (2r)²

F' = 4GmM / 4r²

F' = GmM / r²

F' = 16 units

The new force of attraction between the two objects will be remain the same.

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Answer:

the speed of the rocket is 45454.5455

Explanation: Because the speed formula is basically just distance/ divided by time all you need to do is divide 200,000 meters by 4.40 seconds. And then thus you will get the speed.

Answer:

45454.55 m/s

Explanation:

[tex]S=\frac{d}{t}[/tex]

= [tex]\\S=\frac{200000}{4.40}[/tex]

=45454.55 m/s

Answer:

126.32m/s

Explanation:

The formula for calculating the speed of wave is expressed as:

Speed of wave = frequency/wavelength

Given

Wavelength = 4.75m

Frequency = 600Hz

Required

Speed of the wave

Substitute the given value into the formula

Speed = 600/4.75

Speed = 126.32m/s

Hence the speed of the wave is 126.32m/s

Answer:

Explanation:

You can approach an expression for the instantaneous velocity at any point on the path by taking the limit as the time interval gets smaller and smaller. Such a limiting process is called a derivative and the instantaneous velocity can be defined as.#3

For the special case of straight line motion in the x direction, the average velocity takes the form: If the beginning and ending velocities for this motion are known, and the acceleration is constant, the average velocity can also be expressed as For this special case, these expressions give the same result. Example for non-constant acceleration#1

Answer:

Mass of the apple is 200g or 0.2 kg

Force acting on it will be,

Force= Mass× acceleration due to gravity

Force= 0.2×9.8 Newton= 1.96 Newton

Answer:

2 N

Explanation:

The question requires you to express the weight of the apple into Newton

1 kg = 10 N

200g = 200/1000 = 0.2 kg

1 kg = 10 N

0.2 kg = ?

0.2 * 10 = 2 N

Answer:

large

Explanation:

the harder you pluck the louder it gets

If you pluck the guitar string hard, the sound waves it gives off will have larger amplitudes

We know that, for soundwaves, the amplitude is related to the intensity of the sound.

If you pluck the guitar string hard, you will notice that the intensity of the sound increases. So we can conclude that the amplitude of the soundwaves will be larger than if you plucked the guitar string softer.

Then the complete statement would be:

"The sound waves it gives off will have larger amplitudes."

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Answer:

The tension in the rope is 10 N

Explanation:

The Force Vector

Like all vectors, the force has a magnitude and direction. Vectors can be decomposed into two perpendicular components on both axes.

The tension in the rope (F) can be calculated by using vector decomposition as follows.

The figure included below shows a force F which horizontal component is known to have a value of Fx= 5 Nw. The angle formed by the force and its horizontal component is 60°.

We can use the trigonometric ratio called the cosine to find the magnitude of F as follows:

[tex]\displaystyle \cos 60^\circ = \frac{5}{F}[/tex]

Solving for F:

[tex]\displaystyle F = \frac{5}{\cos 60^\circ}[/tex]

[tex]\displaystyle F = \frac{5}{\frac{1}{2}}[/tex]

Thus, F = 10 N

The tension in the rope is 10 N

Answer:

To solve this problem we will apply the principle of conservation of energy for which we have that the potential energy on a body, is equivalent to the work done on it at the given point. Therefore we will have the following equality

At the same time we know that work is equivalent to the Force applied over a given distance, so,

The potential energy is equivalent to the product between mass, gravity and height. Recall that the product of mass and gravity is equivalent to weight (The same given in the statement)

Equating,

Then,

Replacing,

Therefore the force needed to lift the piano is 600N

Explanation:

HOPE THIS HELPS!!!

Answer:

Material medium

compressions and rarefactions

Explanation:

A sound wave is an example of a mechanical wave. All mechanical waves require a material medium for propagation. The medium for the propagation of sound is air. This is the reason why, if you cover your mouth, it will be difficult for another person to hear whatever you are saying.

Sound is also a longitudinal wave. Longitudinal waves are described in terms of compressions and rarefactions. Compressions refer to areas where air molecules crowd together while rarefactions refer to areas where the air molecules spread out.