A certain transformer doubles input voltage. If the primary coil has 10 A of current, then the current in the
secondary coil is
O 25 A.
O 5 A.
O none of the above
O 2A.
O 10 A.

According to the law of universal gravitation:

gravitational force is directly proportional to the mass of the object as shown in the equation below

Since the force of gravity varies directly with the mass, as the mass incr

ANSWER

EXPLANATION

We want to find the angle at which the range for the projectiles will be the same.

The range for a projectile is given by:

where u = initial velocity

θ = angle of the projectile

g = acceleration due to gravity

For a projectile to have the same range as one with an angle of 33° (given that other values are constant), the value of sin(2θ) must be equal for both projectiles.

Let us find the value of sin(2(33°)):

Let us find the same for the angles in the options:

As we can see, the angle that will result in the same range as 33° is 57°.

The answer is option a.

With the application of resolution of vectors, the horizontal velocity is 23.99995 m/s

Uniform speed is also known as constant speed. This can be defined when the distance travel by an object per time taken is constant.

Given that a truck travels up a hill with a 6.9" incline. The truck has a constant speed of 24 m/s.

First convert minute to degree.

1 minute = 0.0166667

6.9 minute = 6.9 × 0.016667 = 0.115 degree

The formula for the horizontal component of the truck's velocity will be UcosФ, while the vertical component is UsinФ

Substitute all the parameters into the equation.

Horizontal velocity = 24cos 0.115 = 23.99995 m/s

Therefore, the horizontal component of the truck's velocity will be 23.99995 m/s which can be approximated to 24 m/s

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Answer:

Energy = 30J

Explanation:

Energy = Force x Distance

Energy = 120 x 0.250m

Energy = 30J

Answer:

Explanation:

Given:

a = - 20.5 m/s²  (Hockey player brakes)

t = 0,4 s

V = 0 m/s (Hockey player stopped)

______________

V₀ - ?

V  = V₀ + a·t

Initial velocity:

V₀ = V - a·t

V₀ = 0 - (-20.5)·0.4 = 20.5·0.4 = 8.2 m/s

V₀   ≈ 30 km/h

Answer:

i hop this help you :)

Explanation:

How Does Radiant Energy Work? Radiant energy moves from one place to another in the form of electromagnetic waves or electromagnetic radiation. At its most elementary level, electromagnetic waves are made up of photons, which have no mass and move at the speed of light.

Answer:

Explanation:Radiant energy is used for radiant heating. It can be generated electrically by infrared lamps, or can be absorbed from sunlight and used to heat water. The heat energy is emitted from a warm element (floor, wall, overhead panel)

A force of 1 Newton is equal to 1 kgm/s^2 in the International System of units (SI)

The two objects pass each other at a height of 41 m above the ground.

The equations of motion are the set of equations that describe the relationship between the velocity, acceleration, time, and distance traveled by the object.

The equation used to calculate the distance or height covered by an object is:

S = ut + 1/2 at²

Given, the first object  has speed downward, u₁ = -10 m/s

The height of the first object from the ground, S₁ = 60 m

The initial speed of the second object, u₂ = 40 m/s

The distance S for the first object thrown downward:

S = S₁ + u₁t -(1/2)gt²

S = 60 - 10t - (1/2)gt²                                                      ...........(1)

The distance S for the second object thrown upward:

S = u₂t -(1/2)gt²

S = 40 t - (1/2)gt²                                                            ............(2)

The equation (1) and (2) solve to find the value of 't':

60 - 10t - (1/2)gt² = 40 t - (1/2)gt²  

60 = 50 t

t = 6/5 sec

Substitute the value of 't' in equation (2) to find the value of S:

S = (40) (6/5) - (1/2)× (9.81) ×(6/5)²

S = 41 m

Therefore, both objects pass each other at a height of 41 m above the ground.

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Given data:

* The force applied on the bookshelf towards the direction of motion by George is,

* The force applied on the bookshelf towards the direction of motion by the friend of George is,

* The force of friction opposite to the direction of motion is,

Solution:

Thus, the net force acting on the bookshelf is,

Here, the negative sign before the friction force indicates the direction of friction force is oppoiste to the direction of motion,

Substituting the known values,

Here, the positive value of net force indicates the net force is acting in the direction of motion of the bookshelf.

Thus, the bookshelf will move to the right with a force of 4 N.

Hence, 4th option is the correct answer.

The speed of the ball when released from the top will be 2.97m/s at the bottom of the swing.

The length L of the string of ball is 1.2 meter.

The angle made by the string while going up is 20°.

We know,

According to the law of conservation of energy,

Total energy remains constant at every point of the motion, because energy can neither be created nor be destroyed,

So,

Total energy at the top point = Total energy at the bottom point

MgH = 1/2Mv²

Where,

M is the mass of the ball,

g is the acceleration due to gravity,

v is the speed at the bottom point,

H is the height till it is raised.

We can find H,

Total length minus vertical component of the length,

H = L - LcosA

H = 1.2(1-cos20°)

H = 1.2(1-0.93)

H = 1.2(0.37)

H = 0.444 meters.

Now, putting all the values, to find the value of v,

MgH = 1/2Mv²

gH = 1/2v²

v = √2gH

v = √2x10x0.444

v = 2.97m/s

Speed of the ball at the bottom is 2.9m/s.

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Answer:

Explanation:

Is the equation above stoichiometrically balanced? (And what does stoichiometric mean?). This equation tells us that for each mole of octane (each 116 g!), 8 moles of carbon dioxide (

8

×

44

⋅

g

) will result. Now the question tells us that 1.8 gallons of gas have been consumed.

Answer:

Explanation:

By the speed addition theorem:

V = 20 - 5 = 15 km/h

ANSWER:

92.09 kg.

STEP-BY-STEP EXPLANATION:

Mass board (M) = 65 kg

Length board (L) = 6.2 m

Left edge wooden (l) = -2 m

Tension (T) = 800 N

There are a total of 3 forces acting on the board, they are the following:

Since the board is balanced, the net torque acting up will be equal to the net torque acting down.

So we can establish the following balance:

The mass of the wooden crate is 92.09 kg.

Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. when they hit the ground (b) The heavier one will have twice the kinetic energy of the lighter one.

For two object's, one of mass m and other of mass 2m , the kinetic energy is given by :

K.E = (1/2) mv²          for mass m

K.E = (1/2) (2mv²)           for mass 2m

It is clear that , the kinetic energy of mass 2m is twice that of the object of mass m. and their velocity are equal.

When the object dropped from top or from some height its acceleration is equal to acceleration due to gravity. initial velocity will be zero.

Thus, Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. when they hit the ground (b) The heavier one will have twice the kinetic energy of the lighter one.

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a) Accelerating upwards

Consider the diagram drawn below

The force of gravity acts downward

The normal force acts upward

That is, if the normal force is greater than the force of gravity, the object accelerates upwards

   The ball's gravitational potential energy is converted into kinetic energy as it falls toward the ground.

    Y = 1/2 g t 2, where y is the height above the ground, g = 9.8 m/s2, and t = 1.3 s, is the formula for problems like these. Any freely falling body with an initial velocity of zero meters per second can use this formula. figuring out how much y is.

   A ball drops from the top of a building and picks up speed as it descends. Its speed is increasing by 10 m/s every second. What we refer to as motion with constant acceleration is, for example, a ball falling due to gravity.

    The ball's parabolic motion causes it to move at a speed of 26.3 m/s right before it strikes the ground, which is faster than its straight downhill motion, which has a speed of 17.1 m/s. Take note of the rising positive y direction in the above graphic.

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Annular and penumbra are terms that are associated with Solar and lunar eclipses. Option C is the correct answer

An eclipse is a result of a shadow cast by one heavenly body on another. There are eclipse of the sun or solar eclipse and eclipse of the moon or lunar eclipse.

Annular and penumbra actually refer, respectively, to the phenomenon known as solar and lunar eclipses.

Penumbra is a region of outer light or grey area of a shadow cast by an object or heavenly body.

While Annular can be formed under condition where the extreme rays at the moon's edge intersect before reaching the earth.

Therefore, Annular and penumbra refer to the solar and lunar eclipses respectively.

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We will have the following:

Newton's first law: If a body is in motion it will remain in motion and if a body is still it will remain still until an external force acts upon it.

The example would be if Usain is still at the beginning of the race, he will remain still until he uses enough force to move.

Newton's second law: F = m*a

The example would be that in order to move his own mass he will need to apply enough force so he can start running, and the change in velocity he will experience will then be greater than 0.

Newton's third law: Every action has an equal and opposite reaction.

The example would be when Usain is running he is pushing the Earth so he gains movement, and so the Earth pushes Usain with the same magnitude but in opposite direction.

The magnetic field lines are more around the magnet. In this magnetic field lines, the magnetic force are observed. When the paper clip comes under these magnetic field lines, it will experience more force.

By the decreasing the distance between the magnet and paper clip, more force will act on the paper clip. The magnet will attract the paper clip with the magnetic force towards itself and also adjust the direction the direction of clip depending upon the direction of north pole and south pole of the magnet.

Thus, the option D is the correct option.

Answer: d

Explanation:

i took the quiz.

The intensity of sunlight on the Earth is about 1367 W/m^2. The earth has to be 131 the distance farther away

This is further explained below.

Generally, bet the power emitted by the sun is P. so. at the distance of earth intensely where [tex]$r_E$[/tex] is the distance of the earth from the sun. were [tex]$I_1=1362 \frac{w}{m^2}$[/tex]

Therefore

p=4 [tex]\pi 1367 r_E^2[/tex]

let at distance [tex]\gamma r_E$[/tex] is a positive number) the intensity is the same as the intensity at 10m away from a 100w bulb. So.

In conclusion,

[tex]\begin{aligned}&\frac{P}{4 \pi\left(\gamma r_{\varepsilon}\right)^2}=\frac{100}{4 \pi 10^2}\\\\&\text { or, }\left(\gamma r_E\right)^2=P=4 \pi 1367 r_E^2\\\\&\therefore \gamma=\sqrt{4 \pi \times 1367}\\\\&=131.06\\\\ }\end{aligned}[/tex]

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Answer:

Explanation:

Focal length

f

=

10.8

c

m

Object distance

d

o

=

35.7

c

m

Part A:

The image distance would be

1

f

=

1

d

o

+

1

d

i

1

10.8

c

m

=

1

35.7

c

m

+

1

d

i

d

i

≈

15.5

c

m

Part B:

The magnification would be

m

=

−

d

i

d

o

=

−

15.5

c

m

35.7

c

m

≈

−

0.43

Part C:

The image distance if the object distance

d

o

=

5.59

c

m

, would be

1

f

=

1

d

o

+

1

d

i

1

10.8

c

m

=

1

5.59

c

m

+

1

d

i

d

i

≈

−

11.6

c

m

Part D:

Its magnification would be

m

=

−

d

i

d

o

=

−

−

11.6

c

m

5.59

c

m

≈

2.08

Answer: The direction of the resultant can be determined by finding the angle that the resultant makes with either the north-south or the east-west vector. The diagram at the right shows the angle theta (Θ) marked inside the vector addition triangle. This angle theta is the angle that the resultant makes with west.

Explanation: hope this helps

Answer:

160.49 m /s

Explanation:

We know that the angular speed of the disks is 1209 rev/min.

Let us convert this into degrees / s.

Now

1 rev = 360 degreees and 1 min = 60 s; therefore,

Now, we know that the angular separation of the holes in the two disks is 33.9 degrees. How long did it take the paper disk to rotate by this amount? The answer is

where t is the time needed.

Solving for t gives

This means 4.67 * 10^-3 seconds passed before the bullet hit the second disk after hitting the first.

Now, we know that in those 4.67 * 10^-3 seconds, the bullet certainly travelled 75 cm = 0.75 m; therefore, its speed must be given by

dividing both sides by 4.67 * 10^-3 s gives

rounded to the nearest hundredth.

Hence, the velocity of the bullet (rounded to the nearest hundredth) is 160.49 m/s.

Given,

The linear velocity of the pizza dough, v=0.65 m/s

The radius of the pizza dough, r=0.10 m

The mass of the pizza dough, m=0.50 kg

The centripetal force of an object is given by the equation,

On substituting the known values in the above equation,

Thus the centripetal force experienced by the pizza dough is 2.11 N

Answer:

it's from gravity because when you throw something up it goes forward a certain distance

The diagram of the object on the inclined plane is shown below

The mass of 7kg is exerted on the plane surface. It is acted upon by gravity. The force exerted on the surface is calculated by applying the formula,

F = mass x acceleration due to gravity

Assumme acceleration due to gravity is 9.8m/s^2, then

Force = 7 x 9.8 = 68.6N

The surface exerts an opposite force of the same magnitude with the force of the object but in opposite direction. Since it is inclined at an angle of 36.9 degrees,

Normal force = mgCosθ = 68.6Cos36.9 = 54.86N

Recall, frictional force = normal reaction x coefficient of friction

Given that coefficient of kinetic friction = 0.35,

Frictional force = 54.86 x 0.35 = 19.201N

This is the force that must be overcome to keep the object moving.

The force pulling the object upwards along the inclined plane is

mgSinθ = 7 x 9.8 x Sin36.9 = 41.19N

Since the velocity is constant, it means that there is no acceleration. The net force is zero. The force required to pull the mass and make it move at constant velocity must be equal to the sum of the exerted force and the the frictional force(Since it involves coeffricient of kinetic friction, it would cause the object to keep moving)

Thus,

Required force = 19.2 + 41.19 = 60.4N

Option E is correct

16432 N force is required  to accelerate a 1,264 kg car at a rate of 13 m/s²

Force is an external agent that may change the condition of rest or motion of a body. It has a magnitude as well as a direction. The direction of the force is the place where force is applied, and the application of force is the location where force is applied. Newton (N) is the SI unit of force.

Given that,

Mass of the car (m) = 1264 kg

Acceleration (a) = 13 m/s²

Now calculate how much force (F) is required,

F = m × a

F = 1264 × 13 kg m/s²

F = 16432 N

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Answer:

Yes, it is possible for an object to be in motion without,no net force acting on it.

Explanation:

Answer:

Its is not possible for a object to be in motion with zero net force

Explanation:

This means that an object thats has no net force WILL BE IN REST AND CANT BE IN MOTION

Since solar appliances uses solar power, the advantages of using them are

1) Green house effect is minimised since fuels are not burnt to power them.

2) The source of power is renewable. This means that the power for the appliances is readily available.

3) Pollution is reduced

4) They are safer than traditional powered appliances

The disadvantages include

1) The availability of power varies with time. It is reduced at night, winter periods because of lack of sunshine. This means that the usage of solar appliances would be limited during these periods.

2) High cost of installing solar power and batteries might be required to store power and this makes it to be more expensive.

3) The appliances may not be as efficient as traditionally powered appliances.