Help number 3 ASAP !!!

Answer:

A. Particle model.

Explanation:

The photoelectric effect describes when light shines on a piece of metal, and the metal releases electrons. The model of light behavior which best helps to explain this effect is the particle model. According to Isaac Newton, he postulated that light consists of little (tiny) particles which typically travels in a straight line and from his experimental investigation he observed that white light comprises of a mixture of colors.

Sir Newton observed that, when light shines on a piece of metal, the metal releases electrons because the energy of the tiny light particles are greater than the binding energy of the electrons residing in the metal. This theory is known as the particle model of light.

Answer:

12.5 m/s

Explanation:

Given that,

The initial horizontal and vertical components are 12.50 m/s and 21.70 m/s, respectively.

We need to find the horizontal velocity of the ball at position C.

It is a case of projectile motion. We know that in case of projectile motion, the horizontal velocity of the projectile remains the same while vertical velocity varies. It can be very clear that the horizontal velocity at C is 12.5 m/s.

Answer:

Yes using toothpaste and backing soda is whiting because Toothpaste by itself has whiting products in it which eat plaque off your enamel.

Explanation:

Unlike backing

soda it has an acid that cleans surfaces almost like bleach but safe enough to us on your teeth.

Don't use bleach on teeth it an kill you.

Answer:

Ok let me figure this out

Explanation:

#9 asks what is the relationship between distance and force?

The relationships between the two are of the following: if you have distance you woulnt have force, and if there was no force then there is no distance, the 2 countereact each other and balance the scale

Answer:

its very important in science because without atoms the universe would have not been created and our sun and our own planets

The nuclear reactions generally occurs in the deep part of the earth called the core. It is the fusion reaction which produce huge amount of energy to the universe. So the nuclear reactions important to the universe.

The process in which two lighter nuclei fuse together to form a heavier nucleus with the simultaneous release of a huge amount of energy is defined as the nuclear fusion. Some mass is always lost which is converted into energy in accordance with Einstein's equation.

It is the fusion reactions which are common in the interior of stars. The energy of our sun is believed to arise from a number of complex fusion steps. The sun is the ultimate source of energy in the universe which is due to the fusion reaction.

The nuclear reactions are responsible for the nucleosynthesis which means the formation of the elements in the universe.

To know more about nuclear reactions, visit;

https://brainly.com/question/3246846

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Answer:

Well, there aren't any options, but I can still try to help anyway. Peer review can help immensely with finding errors in your writing. The reason being, someone else is more likely to find errors that you weren't able to spot on your own, or may have just missed. How you read also may come out differently, and based on someone else's opinion and feedback, you can change your writing to be more understandable and correct.

Explanation:

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Answer:

please mark brainliest!

Explanation:

here are a few examples-

- The heat gives off subtle infrared rays which produce thermal energy to heat the floor.

- In the space of only a few nanoseconds, a great deal of magnetic energy is converted into the thermal energy of the plasma.

- Although there have been some changes in the thermal energy in the park since 1871, there has been no appreciable diminution.

- Hence a part of what must be included in thermal energy is not simply proportional to temperature as is commonly assumed.

hope this helps !

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Explanation:

The largest face of this rectangular block is 2*3 = 6 square meters. You simply pick the two largest sides and multiply them to get the largest area.

Pressure is defined as the force divided by area. The larger the area gets, the smaller the pressure will be. This is because the pressure is spread out over more area to reduce the per square unit pressure amount.

The block is 60 kg and the acceleration of gravity is roughly 10 m/s^2

So the force pulling down on the block is roughly 60*10 = 600 newtons.

Now we can find the pressure

P = pressure = unknown

F = force = 600 N

A = area = 6 square m

P = F/A

P = (600 N)/(6 m^2)

P = 100 (N/m^2)

P = 100 pa

Where "pa" stands for the unit "pascals", which is one unit for pressure.

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Note what happens when we make A as small as possible. That happens with the 1 by 2 side, so the area is A = 1*2 = 2, and we get

P = F/A = 600/2 = 300 pascals

Reducing A enlarges P. Consequently, minimizing A leads to maximizing P. So the max pressure occurs on the face that is 1 m by 2 m.

Answer:

V = 4i^ + 2j^

Explanation:

We are given;

Velocity in the x-direction; V_x = 4 m/s

Velocity in the y-direction; V_y = 2 m/s

Now, in terms of standard basis vectors, we normally write the resultant velocity as;

V = (V_x)i^ + (V_y)j^

Thus, the resultant velocity is;

V = 4i^ + 2j^

Answer:

Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles.

Explanation:

Answer:

The molecules of a gas move apart when they collide. The average kinetic energy of the particles in a liquid (or solid) is small enough that the forces of attraction between them is sufficient to hold the particles close together. The molecules in a liquid (or solid) do not move apart.

Explanation:

Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles.

Answer:

Carbon (see below)

Explanation:

To identify an element on the period table, you can use its atomic number—or its number of protons.

The atomic number of an element is located in the upper left-hand corner of each square in the periodic table. Refer to IMAGE.A for more info.

If you look at the periodic table, you can spot carbon in the nonmetals.

Carbon's upper left-hand corner has a 6. Refer to IMAGE.B for more info.

Answer:

static electricity

Explanation:

Answer:

0.003292

Explanation:

Answer:

piglets

Explanation:

more than 3

Answer :pedestrian walker.

Explanation:

Answer: Density

Explanation: When the fluids particles are heated, they move faster. As they move faster, the particles occupy more space, causing the density to decrease.

Answer:

A. Density

Explanation:

Answer: 20 Oreos

Explanation:

Answer:

KE= energy associated with motion

PE= energy associated with position

KE example= throwing a ball (ball moving= KE), skateboarding

PE example= dropping a book (since the book is held above the ground, it has PE)(as it falls, PE is converted to KE)

Answer:

The cantaloupe has a kinetic energy that is 5 times that of the banana.

Explanation:

Kinetic energy (KE) = [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex]

where m is the mass of the object and v its velocity.

For the banana, let its mass be represented by m and its velocity by v.

So that:

Kinetic energy of the banana = [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex]

For the cantaloupe, given that its mass is 5 times that of banana (5m) but has the same speed as that of banana.

Then,

kinetic energy of the cantaloupe = [tex]\frac{1}{2}[/tex] 5m[tex]v^{2}[/tex]

                                                       = [tex]\frac{5}{2}[/tex]m[tex]v^{2}[/tex]

                                                      = 5([tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex])

                                                      = 5 x kinetic energy of the banana

The cantaloupe has a kinetic energy that is 5 times that of the banana.

Answer:

Explanation:

Given data

mass of basket ball m1=0.6kg

mass of tennis ball m2= 0.04kg

velocity of basket ball v1=7.2m/s

velocity of  tennis ball  v2=22m/s

velocity of basket ball v3=?

velocity of  tennis ball  v4=32.7m/s

we know that the expression for elastic collision is given as

m1v1+m2v2=m1v3+m2v4

substituting we have

0.6*7.2+0.04*22=0.6*x+0.04*32.7

4.32+0.88=0.6x+1.308

solving for x we have

3.892=0.6x

divide both side be 0.6 we have

x=3.892/0.6

x=6.49m/s

The velocity of the basketball after the collision is 6.49m/s

Answer:

3.6 m/s to the right

Explanation:

I gotchu

GREETINGS!

For Horizontal Distance formula is,

                               [tex]R = \frac{V_{o} ^2}{g} Sin2[/tex] θ

where,

            R is range or horizontal distance

            [tex]V_{o}[/tex] is initial velocity

            g is acceleration due to gravity

            θ is the angel it makes

so,

    by putting the initial velocity and EACH ANGEL that is given in the data,

we will get range respectively,

for 31 degree = 565m

for 89 degrees= 22m

for 17 degrees = 357.88m

for 49 degrees = 633.77m

for 40 degrees = 630.27m

for 78 degrees = 260.3 m

SO FROM SHORTEST TO LONGEST IS,

89 degrees i.e. 22m , 78 degrees i.e. 260.3 m, 17 degrees i.e. 357.88m, 40 degrees i.e. 630.27m, 49 degrees i.e. 633.77m

I HOPE IT HELPS YOU :)

Answer: positive terminal

Explanation: A voltmeter reading is a process of measuring electic potentials in volts with voltmeter. A positive terminal is the terminal of a battery or other voltage source toward which electrons flow through the external circuit.

Answer:

10 yards per second

Explanation:

Answer:

The ice skater will spin at an angular speed of 7.5 revolutions per second.

Explanation:

From statement we notice that ice skater can be considered as a system, on which no external forces are exerted, such that Principle of Angular Momentum can be applied:

[tex]I_{1}\cdot \omega_{1} = I_{2}\cdot \omega_{2}[/tex] (Eq. 1)

Where:

[tex]I_{1}[/tex] - Moment of inertia of the ice skater when her arms are outstretched, measured in kilogram-square meters.

[tex]\omega_{1}[/tex] - Angular speed when arms are outstretched, measured in revolutions per second.

[tex]I_{2}[/tex] - Moment of inertial of the ice skater when her arms are pulled, measured in kilogram-square meters.

[tex]\omega_{2}[/tex] - Angular speed when arms are pulled, measured in revolutions per second.

If [tex]I_{1} = 5\,kg\cdot m^{2}[/tex], [tex]\omega_{1} = 3\,\frac{rev}{s}[/tex] and [tex]I_{2} = 2\,kg\cdot m^{2}[/tex], the angular speed when arms are pulled is:

[tex]\omega_{2} = \frac{I_{1}}{I_{2}} \cdot \omega_{1}[/tex]

[tex]\omega_{2} = \left(\frac{5\,kg\cdot m^{2}}{2\,kg\cdot m^{2}} \right)\cdot \left(3\,\frac{rev}{s} \right)[/tex]

[tex]\omega_{2} = 7.5\,\frac{rev}{s}[/tex]

The ice skater will spin at an angular speed of 7.5 revolutions per second.

Answer:

4.2 m/s2

Explanation:

By using Newton's second law, the cart's acceleration is 4.2 m/[tex]s^{2}[/tex]

Given that a spring scale is used to exert a net force of 2.7 N on a cart.

If the cart's mass is 0.64 kg, then, we can use Newton's second law to solve the question.

F = ma

Force F = 2.7 N

Mass m = 0.64 kg

Acceleration a = ?

Substitute all the parameters into the formula

2.7 = 0.64a

a = 2.7/0.64

a = 4.2 m/[tex]s^{2}[/tex]

Therefore, the cart's acceleration is 4.2 m/[tex]s^{2}[/tex]

Learn more about force here: https://brainly.com/question/12970081

Answer:

90.0 + 80 = 170

2 signifigant figures

1.70 x 10^2

Answer:

The stopping distance for the car when the driver slams on her brakes is 7.38 m.

Explanation:

The distance traveled for the car after stopping can be found using the following equation:

[tex] v_{f}^{2} = v_{0}^{2} + 2ad [/tex]

Where:

vf is the final speed = 0 (it stops)

v₀ is the initial speed = 11 m/s

a is the acceleration = -8.2 m/s²

d is the distance =?

When the driver slams on her brakes the distance traveled is:

[tex]d = -\frac{v_{0}^{2}}{2a} = -\frac{(11 m/s)^{2}}{2*(-8.2 m/s^{2})} = 7.38 m[/tex]

Therefore, the stopping distance for the car when the driver slams on her brakes is 7.38 m.

I hope it helps you!