If you have a mass of 30 kilograms and you are resting on top of a hill that is 20 meters high how much energy would you have.

If the mixture is thermally isolated from its surroundings, then it, loses thermal energy to the environment outside as it comes to a final temperature. The correct answer is d.

When the sample of lead is placed in the water, heat will flow from the lead to the water until they reach a common final temperature. Since the final temperature will be less than the initial temperature of the lead, heat must have flowed out of the lead into the surroundings, causing the lead to lose thermal energy to the environment outside the system.

Since the mixture is thermally isolated from its surroundings, no thermal energy is exchanged between the system (lead and water) and the environment during the process. However, heat can still flow within the system itself until thermal equilibrium is reached. Option d is correct.

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Answer:

Explanation:

C. Adding salt to water increases the boiling point and decreases the freezing point.

Stratospheric ozone depletion refers to the reduction in the amount of ozone gas in the Earth's stratosphere, which is located at an altitude of about 10 to 50 kilometers above the Earth's surface.

Ozone depletion is caused by the release of certain chemicals into the atmosphere, such as chlorofluorocarbons (CFCs) and other ozone-depleting substances (ODSs). These chemicals react with and break down ozone molecules, reducing the amount of ozone in the stratosphere.

Ozone depletion has been identified as a serious environmental problem, as it can have significant impacts on human health, as well as on ecosystems and the environment as a whole. Increased exposure to ultraviolet (UV) radiation, which is normally absorbed by ozone in the stratosphere, can lead to skin cancer, cataracts, and other health problems in humans. It can also affect plant growth, marine ecosystems, and the climate system.

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The prizes can be awarded in 8 different ways so that you win 1st prize and your sister wins 2nd prize.

To determine the number of ways the prizes can be awarded, we first note that you and your sister have already been assigned the 1st and 2nd prizes, respectively. This leaves 8 remaining participants who are eligible for the 3rd prize. Since the prizes are awarded at random, any one of the 8 remaining participants can be chosen for the 3rd prize. Therefore, there are 8 different ways the prizes can be awarded in a scenario where you win 1st prize and your sister wins 2nd prize.

When calculating the number of ways the prizes can be awarded, we consider the specific roles assigned to you and your sister and then focus on the remaining participants. The key is to recognize that the order of selection matters, as the 3rd prize can be awarded to any of the remaining participants. By considering all the possible choices for the 3rd prize, we arrive at the total of 8 different ways the prizes can be awarded in the given scenario.

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Let's call the length of the race track as "x".

To solve for "x", we can use the formula:

\(\implies\text{ Time} = \dfrac{\text{ Distance}}{\text{ Speed}}\)

Since the race ends in a tie, we know that Jan and Mary both took the same amount of time to run the race. Let's call this time "t".

\(\implies \text{ Time} = \dfrac{\text{ Distance}}{\text{ Speed}}\)

\(\implies t = \dfrac{x - 25}{7.5}\)

\(\implies\text{ Time} = \dfrac{\text{ Distance}}{\text{ Speed}}\)

\(\implies t = \dfrac{x}{8.0}\)

Since both expressions represent the same time, we can set them equal to each other and solve for "x":

\(\implies \dfrac{x - 25}{7.5} = \dfrac{x}{8.0}\)

Multiplying both sides by 60 (the least common multiple of 7.5 and 8.0) to get rid of the decimals:

\(\implies 8(x - 25) = 7.5x\)

\(\implies 8x - 200 = 7.5x\)

\(\implies 0.5x = 200\)

\(\implies x = 400\)

\(\therefore\) The length of the race track is 400 meters.

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Answer:

It is an object that remains a magnet forever.

Explanation:

1. They have evolved their leaves into spikes for minimum water loss through transpiration.

2. They have a waxy layer for minimum water loss.

3. They have thick walls for minimum water loss.

4. They can take water from atmosphere.

5. They change the photo energy from Sun into an intermediate stage and store it, so that they can make food even in night.

Answer:

It's d

Explanation:

Answer: D

Explanation:

Force of gravity

Answer:

the focal length of the mirror is :  \(f=-2.5\,\,cm\)

Explanation:

Use the formula for the formation of image using a divergent mirror and recalling that the image (s') that this mirror formed is virtual, so it is entered as a negative number in the formula. Use the object position (s) as 10, the image position (s') as -2, and derive the value of the focal length:

\(\frac{1}{s} +\frac{1}{s'}=\frac{1}{f}\\\frac{1}{10} +\frac{1}{-2}=\frac{1}{f}\\\frac{1}{10} -\frac{1}{2}=\frac{1}{f}\\\frac{10\,f}{10} -\frac{10\,f}{2}=\frac{10\,f}{f}\\f-5\,f=10\\-4\,f=10\\f=-2.5\,\,cm\)

>>> A plane mirror has a reflective surface that is flat (planar). The angle of reflection equals the angle of incidence for light rays striking a planar mirror. A virtual picture is a representation of an object created at the spot where light rays appear to originate.

Hope it helps

Answer:

any smooth surface which can return back the rays of light in to the same medium is called a plane mirror.

hope it helps

Increasing the distance between an electromagnet and the compass will cause the observed effect of the compass to decrease in strength

The strength of the magnetic field produced by an electromagnet decreases as the distance from the electromagnet increases. This means that if the distance between the electromagnet and the compass increases, the magnetic field that the compass is experiencing will weaken.

As a result, the observed effect of the compass will decrease in strength as the distance between the electromagnet and the compass increases.

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The angle of release for an object to travel the farthest (greatest distance) depends on various factors. However, there is a range of angles that can be considered for a projectile to cover the greatest distance.\(\frac{45}{2}\) degrees angle can be considered as the best angle of release for an object to travel the farthest.

Although the maximum range angle can depend on different conditions and variables, in this case, we will consider a few of them. These include air resistance, initial velocity, and height from which the object is released. Based on these conditions, it has been proved that when an object is thrown at an angle of 45 degrees to the ground, the object covers the greatest horizontal distance.Besides, this angle of release provides the perfect balance between horizontal and vertical velocity components, giving the object the required velocity to cover maximum distance and height.

The maximum range can also be calculated using the following formula:\(R = \frac{u^2sin2\theta}{g}\)Where R is the maximum range, u is the initial velocity, \(\theta\) is the angle of release, and g is the acceleration due to gravity. By differentiating this equation with respect to \(\theta\), we can find that maximum range occurs at an angle of \(\frac{45}{2}\) degrees.

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Answer:

items that would sink : spoon marbles rocks

Explanation:

items that would float : straw feather cotton

Answer:

The different layers of carbon atoms present in graphite are bounded by weak van der Waals forces. ... The cleaning between the layers is done by graphite, thus, it is so slippery and soft. This is the reason why graphite is used in pencil and as lubricants in machines which operate at high temperature.

grahite is used in pencils because its so oily and it also forms quickly so it best sometimes

Answer:

They generate electricity by contact.

Explanation:

The observation presented by the question above shows an example of electricity generated by the contact, which can also be called triboelectrification. This type of electricity is created when two objects made of different materials come into contact with each other, and that contact is interrupted soon afterwards, as occurs when someone, wearing woolen socks, walks over the carpet.

For triboelectrification to occur, it is necessary that at least one of the objects involved is electrically charged. This object, when in contact with another object, will transfer electrons carrying the neutral object, until the two objects have the same electrical potential. When interrupting the contact between the objects, the two are left with equal loads of energy.

The work done on the Puck by the applied force from the most positive to the most negative is c, b, a respectively.

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

F = ma

\(F= \frac{mv}{t}\)

The force applied to an object increases with increases in the velocity of the object.

In the given diagram, the resultant velocity of the puck is calculated as follows;

Figure a:

\(\Delta v = v_f -v_i\\\\\Delta v = 5 - 6 = - 1 \ m/s\)

Figure b:

\(v = \sqrt{4^2 + 3^2} \\\\v = 5 \ m/s\)

Figure c:

\(\Delta v = 4 - (-2)\\\\\Delta v = 6 \ m/s\)

Thus, the work done on the Puck by the applied force from the most positive to the most negative is c, b, a respectively.

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Answer: Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth

Explanation:

Answer:

Brightness.

Explanation:

very bright.

Light energy with very high amplitude would be perceived as very bright or intense light.

Waves with a big maximum displacement or height relate to light energy with a very high amplitude.

This large amplitude equates to a greater intensity or brightness of light in terms of perception.

When high-amplitude light waves enter our eyes, they excite light-sensitive cells, such as the cones in our retinas, more powerfully.

As a result of the increased stimulation, the sense of a bright or powerful light source is formed. The magnitude of the light's amplitude is interpreted by the human visual system as a measure of its intensity, allowing humans to distinguish between dimmer and brighter light sources.

Thus, in human visual experience, light energy with a very high amplitude is related with a heightened feeling of brightness or intensity.

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The angular velocity of the pointed rim of a rotating wheel if, The angular position of a point on the rim of a rotating wheel is given by θ = 4.0 t - 3.0 t² + t³, is 4 rad/ sec.

The rotation rate, which refers to how quickly an item rotates or circles in relation to another point, is measured pictorially by angular velocity. Angular velocity can be defined as the speed at which an item rotates or revolves around an axis.

Given:

θ = 4.0 t - 3.0 t² + t³

Calculate the angular velocity by differentiating the position function as shown below,

dθ / dt = d (4.0 t - 3.0 t² + t³) / dt

V = 4.0 - 6t + 3t²   (Change in position is equal to velocity)

Put the value of time, t = 2

V = 4 - 6 × 2 + 3 × 2²

V = 4 - 12 + 3 × 4

V = 4 - 12 + 12

V = 4 rad/sec

Thus, the angular velocity is 4 rad/sec.

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Answer:

The answer is D i took it on the quiz refrigerants

Explanation:

By Using Euler's method with two steps, we can find the approximate value of Y(2) is 2.125. , where Y is the solution of the initial value problem dy/dx = x - y, and Y(1) = 3.

Euler's method is defined as a numerical technique which is  used to approximate solutions into ordinary differential equations. The method includes dividing the interval of interest into smaller steps and thereafter approximating the solution at each step by using the derivative of the function.

In this case, we are given the initial value problem dy/dx = x - y, with the initial condition Y(1) = 3. To approximate Y(2) using Euler's method with two steps, we will divide the interval [1, 2] into two equal steps.

Step 1:

We start with the initial condition Y(1) = 3. Using the differential equation dy/dx = x - y, we can approximate the value of Y at the midpoint of the interval [1, 2].

Using the step size h = (2 - 1) / 2 = 0.5, we can calculate Y(1.5) as follows:

Y(1.5) ≈ Y(1) + h × (x - y) = 3 + 0.5 × (1.5 - 3) = 3 + 0.5 × (-1.5) = 2.25

Step 2:

Now, using the value of Y(1.5) as the new approximation, we calculate Y(2) using the same process:

Y(2) ≈ Y(1.5) + h × (x - y) = 2.25 + 0.5 × (2 - 2.25) = 2.25 + 0.5 × (-0.25) = 2.125

Thus,  by using Euler's method with two steps, the approximate value of Y(2) is 2.125.

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The complete question is

Use Euler's Method With Two Steps To Approximate Y(2), Where Y Is The Solution Of The Initial Value Problem: Dy : X − Y, Y(1) = 3

The ratio of the crown's apparent weight (in water) to its actual weight is equal to the ratio of the density of the crown to the density of water.

When an object is submerged in a fluid, it experiences an upward buoyant force equal to the weight of the fluid displaced by the object.

This ratio is determined by the Archimedes' principle, which states that an object submerged in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced by the object.

In this case, the apparent weight of the crown in water is reduced due to the buoyant force acting on it. The magnitude of the buoyant force is equal to the weight of the water displaced by the crown. The actual weight of the crown remains the same.

The ratio of the apparent weight to the actual weight depends on the relative densities of the crown and water. If the density of the crown is greater than the density of water (ρc > ρw), the apparent weight will be less than the actual weight (wapparent < wactual).

If the density of the crown is less than the density of water (ρc < ρw), the apparent weight will be greater than the actual weight (wapparent > wactual).

If the densities are equal (ρc = ρw), the apparent weight will be equal to the actual weight (wapparent = wactual).

So the ratio of the crown's apparent weight (in water) to its actual weight is equal to the ratio of the density of the crown to the density of water.

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The correct magnification produced by a plane mirror is option b. 1. A plane mirror creates a virtual image that is the same size as the object, which results in a magnification of 1.

The correct magnification produced by a plane mirror is always 1 (option b). This is because a plane mirror reflects an object without changing its size or shape, so the image produced is always the same size as the object and at the same distance behind the mirror.

                                    Therefore, the magnification is equal to 1, as there is no change in size.
The following numbers is the correct magnification produced by a plane mirror:

a. 3/2
b. 1
c. 1/2
d. 2
e. 1/4

The correct magnification produced by a plane mirror is option b. 1. A plane mirror creates a virtual image that is the same size as the object, which results in a magnification of 1..

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Speed, distance and time can be calculated using a magic triangle. D (the distance) goes in the top of the triangle, S (speed) goes in the bottom left of the triangle and T (time) goes in the bottom right of the triangle.

When John reacts to his partner's complaints by cross-complaining, he is manifesting a form of miscommunication known as defensiveness.

Defensiveness is a defensive response that occurs when someone feels attacked or criticized and responds by counter-attacking or shifting the blame onto the other person. Instead of addressing the concerns or complaints raised by his partner, John deflects them by bringing up his own complaints or grievances. This form of communication can escalate conflicts and hinder effective problem-solving and understanding between partners. Complaints are expressions of dissatisfaction or grievances about a particular issue or situation. People may have complaints in various areas of life, such as relationships, work, customer service, or product quality. Complaints are a form of communication used to express discontent or raise concerns in the hopes of seeking resolution or improvement.

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Answer:

A mother can push the baby carrier 47.1 m far.

Explanation:

Work is the mechanical means of transferring energy. To do work you must follow two rules:

Now let's solve this problem by writing the data down:

\(F= 62\,N\\\\W=2,920\,J\\\\d=?\)

I can solve this by applying the formula:

\(work=force \times distance\\\\W=F\times d\)

Plug the given data in the formula, we'll get:

\(2,920=62\times d\)

Divide both sides by 62:

\(\dfrac{2,920}{62}=\dfrac{62}{62}\times d\)

Therefore:

\(\boxed{d \approx 47.1\,m}\)

Answer: a mother can push a baby carrier  47.1 m exerting a force of 62 N.

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Brainly Team

Answer:

A

Explanation:

Yes. The wave functions allow for a small probability for the particle to pass through the barrier that represents if a particle moves along the x-axis in the positive direction with energy E and it encounters a barrier with potential V > E at x = 0 and extending to x = L. The correct option is a.

There is a chance for the particle to make it to the other side, as the wave functions allow for a small probability for the particle to pass through the barrier. The phenomenon is known as quantum tunneling. Quantum tunneling is a quantum mechanical phenomenon in which a particle can penetrate through a potential barrier, despite having insufficient energy to overcome it. The probability of tunneling decreases exponentially with barrier thickness and height.

In quantum mechanics, the potential barrier describes an energy barrier that must be overcome in order for a particle to proceed. In other words, the potential barrier is an obstacle in the path of a quantum particle. Quantum tunneling occurs when a particle penetrates through the barrier instead of overcoming it. It is not possible in classical mechanics, where a particle with insufficient energy cannot penetrate a potential barrier.

The probability of transmission through the potential barrier decreases exponentially as the height and width of the barrier increase. The exact probability is determined by the energy of the particle, the mass of the particle, and the height and width of the barrier.

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The weight of the air above us causes air pressure. The right answer is (a).

Atmospheric air pressure is the weight of the surrounding atmosphere. A barometer is a tool used to gauge atmospheric pressure. One of the earliest types of traditional barometers is the mercury barometer. The standard unit of measurement for atmospheric pressure in public weather reporting is inches of mercury. At sea level, the average pressure is over 30 inches of mercury (about 76 cm of mercury). Winds are produced as air masses move from locations of higher pressure to areas of lower pressure. As a result, air pressure results from the weight of the air above it. Consequently, the appropriate choice is (a)

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