Students measured the temperature of the water at different depths in lake hale and found that the temperature varied

The impact force of the car during the collision on the wall is 25,000 N.

According to Newton's second law of motion, the force experienced by an object is proportional to the product of mass and acceleration of the object.

Mathematically, the force experienced by an object is given as;

F = ma

where;

Acceleration of an object is given as;

a = v/t

where;

F = ma

F = m(v/t)

F = (mv)/t

F = (1200 kg x 7.5 m/s) / (0.36 s)

F = 25,000 N

Thus, we can conclude that the force experienced by the car during collision on the wall has a magnitude of 25,000 N. This is also the stopping force of the car.

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The complete question is below;

In a laboratory test, a car of mass 1200 kg is driven into a concrete wall

A video recording of the test shows that the car is brought to rest in 0.36 s when it

collides with the wall. The speed of the car before the collision is 7.5 m/s.  Find the impact force of the car.

When a student pulls a cart towards the right on a rough surface, the direction of the frictional force acting on the cart will be to the left in the opposite direction of motion of the cart.

Frictional force is a force that acts to oppose the motion of an object moving over another object.

Frictional force is a contact force as it requires contact between the two surfaces.

Frictional force acts at the surface of separation of the objects.

Frictional force causes wear and tear in moving parts of machinery.

However, frictional force enables the movement of objects over flat surfaces, for example, it aids in walking.

In conclusion, frictional force acts in an opposite direction to the motion of an object moving over another object.

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Answer:

Digital meter is the one which take the input in one form and should output in digital form like in numbers or by any other electronic means where as the analogue meter is the one which uses some mechanical method to display the output like deflection of the needle etc.

make me brainalist and keep smiling

The most significant difference between analog and digital instruments is in their type of output method, i.e., an analog instrument shows the output by the deflection of pointer on a scale, whereas a digital instrument shows the output on a digital display screen in the form of text or numbers

Kinetic energy of each of the following objects compared like K₃ = K₂ > K₁  or   K₃ = K₂ = K₁.

Kinetic energy of an object of mass, m and speed, v is

K = 1/2 mv²

(1) Given, m = 2kg,  v = 2.5m/s

So, K = 1/2 mv²

K₁ = 1/2 × 2×(2.5)²

K₁ = 6.25 J

(2) Given, m = 1kg,  v = 5m/s

K = 1/2 mv²

K₂  = 1/2 × 1×(5)²

K₂ = 12.5 J

(3) Given, m = 1kg,  Vx = 3m/s,  Vy= 4m/s

v = [tex]\sqrt{Vx^{2} + Vy^{2} }[/tex]

v = 5m/s

K = 1/2 mv²

K₃ = 1/2 × 1×(5)²

K₃ = 12.5 J

Hence, K₃ = K₂ > K₁ or K₃ = K₂ = K₁ .

Kinetic energy is the type of energy which is due motion of an object. Kinetic energy is the product of half of mass and velocity square. Its unit Joule and is represented by J.

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It is a true statement that the three categories that American Imperialism sought to enhance were political, military, and economic.

The term imperialism has to do with a situation in which a country that tends to be more powerful continues to control a smaller country owing to the depends of the smaller country on the larger country for aid even though it is fully independent.

We can see that imperialism continues around the world especially in the developing and the less developed countries and this has continued to be an object of intense debate in many quarters.

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Driving into a massive concrete wall and driving into a head-on collision with an identical car traveling toward you at the same speed, both does equal amount of damage.

When the car hits into a wall, it comes to a sudden stop. Similarly, if the car hits another identical car with same speed, the same situation occurs in which the car comes to a sudden stop because the momentum of one car will be cancelled by the momentum of the other car. Either way, due to rapid deceleration the car comes to a dead stop.

The damage could have varied if the car travelling towards you had more or lesser speed than your car. Due to the same speed, both the cars had same momentum. If the speed differs, momentum differs and there will be motion after collision resulting in lesser damage in one car than the other.

Therefore, driving into a massive concrete wall and driving into a head-on collision with an identical car traveling toward you at the same speed, both does equal amount of damage.

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Answer:

The carrying capacity is defined as the environment 's maximal load, which in population ecology corresponds to the population equilibrium, when the number of deaths in a population equals the number of births (as well as immigration and emigration). The effect of carrying capacity on population dynamics is modelled with a logistic function.

Hence: When food, water, and space used by a population stay stable over

time.

Explanation:

Hope this helps.

Answer:

B.

Explanation:

Chlorine has a charge of is -1 and the atomic number of Chlorine is 17

Sea ice loss, glacier and ice sheet melting, sea level rise are the planetary changes that are predicted to occur.

Since the Industrial Revolution, human activities have contributed significantly to the atmospheric release of carbon dioxide and other greenhouse gases, altering the planet's climate. The earth's climate is also influenced by natural processes like variations in the sun's energy and volcanic eruptions.

according to scientists' predictions of the long-term effects of climate change.

CO2, nitrous oxide, methane, chlorofluorocarbons, and water vapor are examples of greenhouse gases. Although the Sun has contributed to past climate changes, the evidence indicates that the Sun cannot be the cause of the current warming.

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The substance that we can from the table that would be solid at a temperature of 10 degrees Celsius is known as acetic acid.

We know that the temperature is the degree of the hotness or the coldness of a body. More appropriately, we define the temperature of a body as the average kinetic energy of the molecules of a body. One of the most effects that the temperature of the body could have is that when the temperature is increased or decreased, there could be a change of state of the body.

This implies that the state of matter that we can find a particular object at a given time would depend heavily on the temperature of the substances. Generally, the state of matter than a material is found is quoted mostly with reference to room temperature.

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Answer:

Cells carry out functions that maintain life.

Living things are nde of one or more cells.

Explanation:

1) cells are building blocks of life. Cells make up tissues, tissues make up organs, organs make up organ systems...

2)microorganisms like bacteria are unicellular which means made of one cell. Human beings however are made of trillions and trillions of cells.

The resistive force of friction (Fr) divided by the normal or perpendicular force (N) pushing the objects together yields the coefficient of friction (fr), which is a numerical value. The formula fr = Fr/N serves as a representation of it.

In terms of math, μ is equal to F/N, where F stands for frictional force and N for normal force. The coefficient of friction has no dimensions because both F and N are measured in units of force (such as newtons or pounds).

The static friction coefficient and the kinetic friction coefficient are the two different types of friction coefficients. While the latter is frequently referred to as the dynamic or sliding friction coefficient, the former is sometimes known as the starting friction coefficient.

A force that holds an object at rest is called static friction. When an object reaches its maximum size, it begins to move. Static friction has an identical magnitude in the opposite direction to any little force applied to an object. If the force is increased, eventually the object will begin to move after the maximum static friction value is reached.

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The radius of the wire with a resistance that is 16 times its original value after stretching will be 1 / 2 times the initial value ( D )

R = ρ L / A

L = V / A

A = π r²

R = Resistance

L = Length

A = Area

V = Volume

r = Radius

R = ρ L / A

R = ρ V / A²

R = ρ V / π² [tex]r^{4}[/tex]

Rearranging for r,

r = [tex]\sqrt[4]{}[/tex] ( ρ V / π² R )

This is the radius of the wire initially

After stretching, R' = 16 R

R' = ρ V / π² [tex]r'^{4}[/tex]

r' =  [tex]\sqrt[4]{}[/tex] ( ρ V / π² 16 R )

r' = 1 / 2 [tex]\sqrt[4]{}[/tex] ( ρ V / π² R )

r' = 1 / 2 * r

Therefore, the radius of the wire after stretching will be 1/2 times the initial value ( D )

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The ball's acceleration just after it is thrown is 10 m/s² downward

option C.

The acceleration of the ball is calculated by applying the following equation as shown below.

When ever an object is projected upwards, its velocity decreases with increase in height and the velocity will become zero when the object reaches the maximum height.

The acceleration of any object projected or thrown upwards is always directed downwards with a magnitude equal to acceleration due to gravity ( 10 m/s²).

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Given the resistors:

10Ω, 15 Ω and 20 Ω

Two resistors are connected in parallel and one in series.

Let's calculate all the possible total resistance values.

When resistors are connected in parallel, the equivalent resistance is:

After finding the equivalent resistance value in parellel, we now add the resistance value with the resistance in series:

• When 10Ω and 15Ω are connected in parallel and 20Ω in series, we have:

R1 = 10 Ω

R2 = 15 Ω

R3 = 20 Ω

When 10Ω and 15Ω are connected in parallel and 20Ω in series the total resistance is 26 Ω.

• When 10Ω and 20Ω are connected in parallel and 15Ω in series, we have:

R1 = 10 Ω

R2 = 20 Ω

R3 = 15 Ω

Hence, we have:

When 10Ω and 20Ω are connected in parallel and 15Ω in series the total resistance is 21.7 Ω.

• When 20Ω and 15Ω are connected in parallel and 10Ω in series, we have:

R1 = 20 Ω

R2 = 15 Ω

R3 = 10 Ω

Thus, we have:

When 20Ω and 15Ω are connected in parallel and 10Ω in series the total resistance is 18.6Ω.

ANSWER:

• When 10Ω and 15Ω are connected in parallel and 20Ω in series the total resistance is 26 Ω.

• When 10Ω and 20Ω are connected in parallel and 15Ω in series the total resistance is 21.7 Ω.

• When 20Ω and 15Ω are connected in parallel and 10Ω in series the total resistance is 18.6Ω.

The energy the bullet have when it leaves the barrel is 2000 J

The energy of the bullet when it leaves the barrel can be obtained as illustrated below:

Energy is defined as the ability to do work.

Energy (E) = Work (W)

Work (W) = force (F) × distance (d)

W = Fd

Thus,

E = W = Fd

E = 4000 × 0.5

E = 2000 J

From the above calculation, we can conclude that the energy of the bullet is 2000 J

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A branch of physics called kinematics, which originated in classical mechanics, defines how points, bodies, and systems of bodies move without taking into account the forces that are responsible for their motion.

Let's go over the four basic kinematic equations of motion with constant acceleration:

s = ut + ½at^2 …. (1)

v^2 = u^2 + 2as …. (2)

v = u + at …. (3)

s = (u + v)t/2 …. (4)

where an is acceleration, s is distance, u is beginning velocity, v is final velocity, and t is time.

To determine the horizontal distance traveled in this instance, we first need to determine the time it takes for the ball to fall vertically to the ground.

Knowing u = 0, a = g = 9.81 m/s2, and s = 5 m for the vertical drop, we can use equation (1) to obtain

s = ut + ½at^2

5 = 0 +4.905t^2

t = √(5/4.905) = 1.01s

Now that we have t, we can calculate the horizontal distance.

s = ut + ½at^2

s = 35(1.01) + 0 (no horizontal acceleration) (no horizontal acceleration)

s = 35.35m

The ball thus travels 35.35 meters before striking the ground.

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The threshold frequency for this metal is, based on its photoelectric effect, [tex]2.11x10^{15} Hz[/tex].

The threshold frequency of the metal is the frequency of electromagnetic radiation that would cause its kinetic energy to be equal to 0. Using the photoelectric effect, the threshold energy can be calculated from the difference between the photon energy invested and the electron's kinetic energy, because the excess energy invested is transformed into kinetic energy. With that in mind, the energy of the photon is:

E = hc/λ = hν
where h is Planck's constant, c is the speed of light, λ is the wavelength of the photon and ν is the frequency of the photon.

[tex]E = 6.626x10^{-34}Js * 3x10^{8}m/s / 75.9x10^{-9}m = 2.62x10^{-18} J[/tex]

Because 1 eV is equal to [tex]1.602x10^{-19}[/tex] J, the kinetic energy of the electron is:

[tex]7.60 x 1.602x10^{-19}J = 12.1752x10^{-19}J = 1.22x10^{-18} J[/tex]

The threshold energy is:

[tex]2.62x10^{-18}J-1.22x10^{-18}J = 1.40x10^{-18}J[/tex]

Now, because E = hν, then ν = E/h, so the threshold frequency will be:

[tex]1.40x10^{-18} J/6.626x10^{-34}Js = 2.11x10^{15}Hz[/tex]

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There is less atmospheric pressure, molecules face less resistance. Therefore, as it warms up, more gas bubbles will rise, and as a result, less baking powder is needed to create the same rising of the cake.

Two main consequences of low air pressure on baked foods are: They will dry out more quickly because liquids boil at lower temperatures at high altitudes, which causes them to rise more easily and lose moisture faster. Gas bubbles have a tendency to form huge, uneven pockets in a batter or dough as leavening progresses more quickly.

The pressure drops as altitude rises. As a result, as the atmospheric pressure drops, the molecules in the solution just need to overcome the lesser amount of resistance to leave the solution. Consequently, when the temperature required for the molecules to depart the solution drops, the boiling point of solutions also drops. Therefore, it takes longer to prepare food effectively when water boils at a lower temperature because the heat that water stores is lower. When it comes to baking powder, the less baking powder we use, the less resistance the molecules must overcome because to the lower ambient pressure. Therefore, as it warms up, more gas bubbles will rise, which will result in less cake rising.

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Answer: I think it's 7.60 184

Explanation: If I did my math right it's 7.60 184

The molecules receive more energy and move faster after they have been heated up.

The term conduction has to do with the process by which heat is transferred along a body by the movement of the particles of the substance. There are three main modes of heat transfer and these are;

Now, we can see that before the flame was introduced, the molecules of the substances all maintained the same average position. The molecules do not move except there is a supply of energy.

Now, when we turn on the flame, we would notice that we have imparted additional energy to the particles that are in the solid when we heat it up. As such, the particles move more freely and we can see that  as the motion of the particles in the image. The portion that shows the particles after the heating shows that they are now translating.

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Answer:

the mixture of chalk and water, muddy water, the mixture of flour and water, a mixture of dust particles and air, fog, milk of magnesia,

Explanation:

Give the definition of suspension. Ans: A suspension is a heterogeneous mixture of two or more substances.In this chapter, we will talk about a suspension. Are you aware of what is it actually? You must have come across many such examples in your daily life. Right? Let us now look at these types of solutions in a more detailed manner. We will discuss their properties and characteristics

ANSWER-wheel turns increasingly angularly in the direction of the person as it approaches them.

Explained: Due to force, torque will result in the following.

torque is equal to force divided by the perpendicular distance and applied in the direction of the subject.

Changes are caused by this torque. in angular momentum

Thus, as a result of new angular momentum pointing more in that direction, the wheel advances in that direction.

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There is a torque created in the wheel as a result of the applied forces. An object's angular momentum will rotate into the wheel as torque has a tendency to modify it.

The person holding the spinning bike wheel lifts it with her right hand and presses it down with her left hand, trying to turn the wheel. as a result, the wheel will experience torque.

The force that can turn an item about its axis is measured as torque. In linear kinematics, force is what makes an object move faster.

The object's mass times its speed is what determines its linear momentum. linear Momentum is a property of any mass-moving object. Because it works with rotating objects, angular momentum only differs in one respect.

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The exit temperature = 5333.33 K

The inlet pressure: P₁ = 150 kpa

The inlet temperature T₁ = 400K

The exit pressure, P₂ = 2 MPa = 2000 kPa

The exit tenperature, T₂ = ?

The relationship between temperature and pressure for an isentropic process is shown below

Substitute the given parameters into the formula and solve for T₂

The exit temperature = 5333.33 K

It has been given that:

15 gallons per minute are the water's volumetric flow rate.

The pipe that exits the pump has a 1 inch diameter.

(a) When the diameter of the pipe that leaves the pump is 1 inch, flow work is done by the water as it leaves the pump and enters the pipe will be

W= 7133.2ft.lbf / min

Here, measuring the amount of work flow performed by the water as it exits the pump and enters the pipe is the goal.

The relation can be used to express the work flow that is supposedly complete:

W = P × V

where;

Pressure is P.

Volume is V.

The gauge pressure is included in the specified outlet pressure.

Now, the relation may be used to express the pressure in the pump P:

[tex]P_{absolute}[/tex] = [tex]P_{gauge}[/tex] + [tex]P_{atmospheric}[/tex]

[tex]P_{absolute}[/tex] = 10 psig + 14.7 psig

[tex]P_{absolute}[/tex]  = 24.7 psig

W =  P × V

W =  24.7 psig  ×  15 gal/min

W = (24.7 psig * [tex]\frac{\frac{lb_{f} }{in^{2} } }{psig}[/tex] ) * (15 [tex]\frac{gal}{min}[/tex] * [tex]\frac{0.1337 ft^{3} }{1 gal}[/tex] * [tex]\frac{144 in^{2} }{1 ft^{2} }[/tex] )

W = 7133.2 [tex]\frac{ft. lb_{f} }{min}[/tex]

This means that the water is stated to produce work at a rate of flow of

W= 7133.2 [tex]\frac{ft.lb_{f} }{min}[/tex]

(b) Work done by the water as it leaves the pipe and enters the pool is:

According to the obtained data:

Through a 1.5-inch-diameter aperture, the pool's water is refilled.

when there is 1 atm of pressure.

The water then exerts the following amount of energy when it exits the pipe and enters the pool:

W = P × V

W equals 1 atm x 15 gal/min.

W = 1 atm * (15[tex]\frac{gal}{min}[/tex] * [tex]\frac{0.1337 ft^{3} }{1 gal}[/tex] * [tex]\frac{144 in^{2} }{1 ft^{2} }[/tex])

W = 4245.24 [tex]\frac{ft.lb_{f} }{min}[/tex]

When a result, the water's work rate as it exits the pipe and enters the pool is at W = 4245.24 [tex]\frac{ft.lb_{f} }{min}[/tex]

(c) Due to the fact that the data provided for the flow rate and pressure do not account for changes in time in the space between the pump and the pool, we may say that the system is in a steady state.

However, the main reason why the system is out of equilibrium is that:

As indicated in the inquiry, the pressure coming out of the pipe is different from the pressure of the water at the pool's surface.

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Answer:

1. A series circuit consisting of:

12 V electrical source

open switch

two light bulbs

10 Ω resistor

2. A parallel circuit consisting of:

9.0 V electrical source

open switch

three 5.0 Ω resistor

3. A circuit consisting of:

three 1.5 V cells connected in parallel

open switch

two light bulbs connected in series

two 15 Ω resistor connected in parallel

4. Draw a circuit diagram consisting of a

9.0 V battery, an ammeter, and a 25 Ω

resistor in series. Include a voltmeter

that is measuring the potential difference

across the resistor.

5. Draw a circuit diagram consisting of a

battery made up of two 1.5 V cells, one

closed switch, two lamps, and an

ammeter in series. Show the direction in

which the current flows.

6. Draw a circuit diagram consisting

of a battery made up of four 1.5 V

cells, one closed switch, one lamp, two

0.50 Ω resistors in series, and a

voltmeter.

Show the direction in which

the current flows.

Rutherford considered these observations and he concluded: The fact that most alpha particles went straight through the foil is evidence for the atom being mostly empty space. A small number of alpha particles being deflected at large angles suggested that there is a concentration of positive charge in the atom.

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The total displacement change from s=+2cm to −5cm, then to +12cm is + 7 cm

Displacement = Final position - Initial position

Final position = + 2 - 5 + 12 cm = + 9 cm

Initial position = + 2 cm

Displacement = ( + 9 ) - ( + 2 )

Displacement = + 7 cm

Displacement is the instantaneous distance between initial and final position. It is a vector quantity. So adding a sign is necessary for displacement.

Therefore, the total displacement change is + 7 cm

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