Which of the following is true about light with a single wavelength?

1) It can be refracted
II) It cannot be dispersed
III) It can be reflected *

Answer:

The work is 750 J

The power is 37.5 watt

Explanation:

Mechanical Work and Power

Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.

Being [tex]\vec F[/tex] the force vector and [tex]\vec s[/tex] the displacement vector, the work is calculated as:

[tex]W=\vec F\cdot \vec s[/tex]

If both the force and displacement are parallel, then we can use the equivalent scalar formula:

W=F.s

Power is the amount of energy transferred or converted per unit of time. In the SI, the unit of power is the watt, equal to one joule per second.

The power can be calculated as:

[tex]\displaystyle P=\frac {W}{t}[/tex]

Where W is the work and t is the time.

a)

The table is pushed d=15 m across a room with a force F=50 N, thus the work is:

W=50 * 15 = 750 J

The work is 750 J

b)

The time needed to push the table is t=20 seconds, thus:

[tex]\displaystyle P=\frac {750}{20}=37.5[/tex]

The power is 37.5 watt

Answer:

W = 1710 kJ

Explanation:

Given that,

Power of a race car, P = 255 hP = [tex]1.9\times 10^5\ W[/tex]

It accelerate from rest to its top speed in 9.00 s.

We need to find the work does the car's engine do in this interval of time.

Power is given by work done per unit time. Mathematically,

[tex]P=\dfrac{W}{t}\\\\W=P\times t\\\\W=1.9\times 10^5\times 9\\\\W=1710\ kJ[/tex]

So, the required work done is is 1710 kJ.

Answer:

c. It is incorrect because sodium phosphate is a compound that has a single composition.

Explanation:

As we know that the sodium phosphate i.e.  chemical compounds comprise of atoms that are interconnected with the bonds of the chemicals

Also the pure substance that is made by only and only one atom or element or only one type of molecule i.e. compound that contains definite and constant composition with different properties of chemicals

the pure substances could be distinct in chemical way but not in the physical manner that represents the difference between the mixture and the pure substance

Hence, the correct option is c.

Answer:

C) - It is incorrect because sodium phosphate is a compound that has a single composition.

Explanation:

Just did the test, good luck :)

Answer:

h = 0.25 [m]

v = 3.26 [m/s]

Explanation:

In order to solve this problem, we must remember that mechanical energy is defined as the sum of kinetic energy plus potential energy.

E1 = Ek + Ep

where:

E1 = mechanical energy = 25 [J]

Ek = kinetic energy = 17 [J]

Ep = potential energy [J]

25 = 17 + Ep

Ep = 8 [J]

Now the potential energy is defined by the following equation:

Ep = m*g*h

where:

m = mass = 3.2 [kg]

g = gravity acceleration = 9.81 [m/s²]

h = elevation [m]

8 = 3.2*9.81*h

h = 0.25 [m]

The velocity can be calculated by means of kinetic energy.

[tex]E_{k} =\frac{1}{2} *m*v^{2}\\17 =\frac{1}{2} *3.2*v^{2} \\v= \sqrt{\frac{17*2}{3.2} }\\v = 3.26[m/s][/tex]

(a) The height of the ball will be h=0.25 m

(b) The speed of the ball will be [tex]V= 3.26\ \frac{m}{s}[/tex]

It is given that

Mass of the ball m=-3.2kg

The kinetic energy of the ball = 17 j

The total mechanical energy of the ball = 25 J

(a) So the total mechanical energy is the sum of the kinetic energy of the ball and the potential energy of the ball.

[tex]E_T=E_{KE}+E_{PE}[/tex]

Now putting the values of the KE and the Total energy we get

[tex]25=17+E_{PE}[/tex]

[tex]E_{PE}=8 \ J[/tex]

Now the formula of the potential energy will be

[tex]E_{PE}=mgh[/tex]

[tex]8=3.2\times 9.81 \times h[/tex]

[tex]h= \dfrac{8}{3.2\times 9.81}[/tex]

[tex]h=0.25\ m[/tex]

(b) Now to find out the speed of the ball we have

[tex]E_K=17\ J[/tex]

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

[tex]v=\sqrt{\dfrac{2E_{KE}}{m} }[/tex]

[tex]v=\sqrt{ \dfrac{2\times17}{3.2} }=3.25[/tex]

[tex]v=3.25 \ \dfrac{m}{s}[/tex]

So the calculated answers will be

(a) The height of the ball will be h=0.25 m

(b) The speed of the ball will be [tex]V= 3.26\ \frac{m}{s}[/tex]

To know more about Kinetic and Potential energy follow

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Answer:

in which standard you are, i am typing your answer till please reply.

Answer:

V₀y = 0 m/s

t = 2.47 s

V₀ₓ = 61.86 m/s

Vₓ = 61.86 m/s

Explanation:

Since, the ball is hit horizontally, there is no vertical component of velocity at initial point. So, the initial vertical velocity (V₀y) will beL

V₀y = 0 m/s

For the initial vertical velocity of golf ball we consider the vertical motion and apply 2nd equation of motion:

Y = V₀y*t + (0.5)gt²

where,

Y = Height = 30 m

g = 9.8 m/s²

t = time to hit the ground = ?

Therefore,

30 m = (0 m/s)(t) + (0.5)(9.8 m/s²)t²

t² = 30 m/4.9 m/s²

t = √6.122 s²

t = 2.47 s

For initial vertical velocity we analyze the horizontal motion of the ball. We neglect the frictional effects in horizontal motion thus the speed remains uniform. Hence,

V₀ₓ = Xt

where,

V₀ₓ = Initial vertical Velocity = ?

X = Horizontal Distance = 25 m

Therefore,

V₀ₓ = (25 m)(2.47 s)

V₀ₓ = 61.86 m/s

Due, to uniform motion in horizontal direction:

Final Vertical Velocity = Vₓ = V₀ₓ

Vₓ = 61.86 m/s

Answer:

Food chain is a linear transfer of energy from the producer to the consumer

producer →primary consumer → secondary consumer → tertiary consumer while food web is the interconnection of two or more food chains

Answer:

Without the ability to measure, it would be difficult for scientists to conduct experiments or form theories. Not only is measurement important in science and the chemical industry, but it is also essential in farming, engineering, construction, manufacturing, commerce, and numerous other occupations and activities.

Explanation:

Make sure to edit so you're not copy-writed and if this was helpful could I please get brain-list

Answer:

The velocity of the acorn just before it reaches the ground is 19 m/s

The kinetic energy when hitting the ground is 3.1 J

Explanation:

Given;

mass of the acorn, m = 0.017 kg

height of fall, h = 18.5 m

Apply the law of conservation of mechanical energy;

mgh = ¹/₂mv²

gh = ¹/₂v²

v² = 2gh

v = √2gh

v = √(2 x 9.8 x 18.5)

v = 19 m/s

Thus, the velocity of the acorn just before it reaches the ground is 19 m/s

Now, determine the kinetic energy when hitting the ground;

K.E = ¹/₂mv²

K.E = ¹/₂(0.017)(19)²

K.E = 3.09 J

K.E = 3.1 J

Therefore, the kinetic energy when hitting the ground is 3.1 J

Answer:

A real image.

Explanation:

A real image is formed by real interaction of rays, hence it is possible to project it on a screen. And where a virtual image is drawn via back tracing the path of reflected rays, hence they don't meet in reality.

Answer:

Explanation:

First we must know that the direction along the vertical are towards North and south while along the horizontal are towards east and west.

Sum of distances along the vertical

4km due north = +4km

3 Km South = -3km (south is along the negative y direction)

6 Km South = -6km

total distance along the vertical = 4-3-6 = -5km

Sum of distances along the horizontal;

8km due East = +8km

4 Km west = -4m (west is along the negative x direction)

total distance along the horizontal = 8-4 = 4km

Displacement is gotten by using Pythagoras theorem

d² = x²+y²

d² = (4)²+(-5)²

d² = 16+25

d² = 41

d = √41

d = 6.4km

Hence Tyler's displacement is 6.4km

Answer:

same as other person

Explanation:

Answer:

D

Explanation:

Answer:

2.625 m/s

Explanation:

This is a momentum question. Momentum is conserved which means that all the starting momentum must be accounted for.

1.5 kg * 2 m/s + 2.5 kg * 3 m's = (1.5 + 2.5)kg * x m/s

3 kg m/s + 7.5 kg m/s = 4 kg * x

10.5 kg m/s = 4 kg x

10.5 / 4 = x

x = 2.625 m/s

inelastic means that after the collision, the masses stick together as though they were one.

Answer:

The way in which objects exert forces on each other is described by Newton’s 3rd law of motion

Explanation:

Objects with mass exert forces on each other via the force of gravity. This force is proportional to the mass of the two interacting objects and is inversely proportional to the square of the distance between them. The factors G, M, and rare the same for all masses at the surface of the Earth.

Answer:

Osteologists are trained to read and translate a bone's story.

Explanation:

This rare skill provides information that helps us better understand ancient cultures, solve mysteries, and learn about animals. Being an Osteologist means you have a variety of job opportunities.

Answer:

b

Explanation:

Explanation:

Matter is changed from one state to another by addition or removal of heat and suitable pressure conditions.

When a solid is heated, it normally melts and changes to liquids which on heating changes to vapor. The randomness of the particles increases from solid to liquid state and to gaseous states.

Also, a gas can be cooled to liquid and on further cooling transformed into a solid matter.

These phase changes are brought about by energy changes in a system. Some form of matter can also sublime by changing form solid to gas and vice versa.

Answer:

6.75m/s

Explanation:

using the second equation of motion, the time is calculated.

and with the formula a= (v - u)/t

where a is acceleration but in this case it's deceleration (and should be negated as you solve it ) .

v is final velocity

u is initial velocity

t is time taken

Answer:

That model grilfriend would probably only want me for the cash and would talk to a million other guys...but the baby orangutan would love me and I would be able to take care of a cute baby!!:)

Explanation:

Answer:

The Answer is D!

Explanation:

I checked it on Khan Academy.

The correct free body diagram of the hanging carrot is option B, where, the forces from two ropes and the net force acting upward and the gravitational force acting downwards.

A free body diagram is a representation of a body with different kinds of forces acting upon it with respect to its position and direction.

There are different kinds of forces namely magnetic force, tension force, nuclear force, gravitational force and the normal force  etc. The force acting on a massive moving body will be the product of its mass and acceleration.

The direction of each force acting upon a body will be different and the displacement also. Here, the carrot hanged by the two ropes will experience forces from both ropes which hangs it down but the force acting is upwards and thus the net force  is upward.

The gravitational force Fg acting on a body is always downward and thus the correct diagram depicting the free body of the carrot with forces is option B.

To find more about forces, refer the link below;

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Answer:

It is likely to be option B: 50 degrees and 50 degrees

Hope it helps.......... pls mark as brainliest.

Answer:

C

Explanation:

acceleration is a change in velocity which means a time rate change in velocity but velocity is the time rate change in displacement