a car, initially at rest, begins moving at time with a constant acceleration down a straight track. if the car achieves a speed of 60 miles per hour (88 feet per second) at time seconds, what is the car's acceleration? include units in your answer. you may need to type the units using the text environment after entering the value.

Answer:

Explanation:

W = FΔx so filling in:

12 = F(30) so

F = .4N

Answer:

Final velocity = 60 m/s

Distance travelled = 9000 m

Explanation:

Applying,

For Final velocity,

v = u+at ............... Equation 1

Where v = final velocity, u = initial velocity, a = acceleration, t = time.

From the question,

Given: u = 0 m/s(at rest), a = 0.2 m/s², t = 5 minutes = (5×60) = 300 s

Substitute these values into equation 1

v = 0+0.2(300)

v = 60 m/s.

Also for distance,

Applying,

s = ut+1/2at²................ Equation 2

Where s = distance travelled.

subtitute thes values above into equation 2

s = (0×300)+(0.2×300²)/2

s = 9000 m

Answer:

 freezing melting sublimating  x y

 x and

Explanation:

To drop a table of states of matter the best headings must be

table name: matter state

    freezing melting sublimation x y

This order goes from the solid state to the gaseous state, which is obtained by introducing heat into the system

Answer: D on edge

X: Heat Is Absorbed

Y: Heat Is Released

Explanation:

sublimation and melting are both absorbing heat(aka getting warmer)as they change state while freezing and deposition are releasing heat(aka getting colder)as they change state

The inductance of the coil connected to this capacitor is 2.49 x 10^-6 H. The maximum capacitance of the capacitor should be 24.2 pF to cover the full range of the broadcast band.

Part A:

The resonant frequency of an L-C circuit is given by the equation:

\($f = \frac{1}{2\pi\sqrt{LC}}$\)

where f is the oscillation frequency, L is the inductance of the coil, and C is the capacitance of the capacitor.

At the minimum capacitance of 4.15 pF, the oscillation frequency is 1.50 MHz. Plugging these values into the above equation, we can solve for L:

\($1.50 \times 10^6 = \frac{1}{2\pi\sqrt{L \times 4.15 \times 10^{-12}}}$\)

L = 2.49 x 10^-6 H

Part B:

At the other end of the broadcast band, the oscillation frequency is 0.543 MHz. We can use the same equation as before to solve for the maximum capacitance:

\($0.543 \times 10^6 = \frac{1}{2\pi\sqrt{L \times C_{max}}}$\)

Assuming that the inductance of the coil remains the same as before (2.49 x 10^-6 H), we can rearrange the equation to solve for Cmax:

\($C_{max} = \frac{1}{4\pi^2 L (f_{max})^2}$\)

where fmax is the maximum oscillation frequency, which is 1.50 MHz (the frequency at the other end of the broadcast band).

Plugging in the values, we get:

Cmax = 24.2 pF

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The block should be released at a height equal to half the radius of the loop in order to be on the verge of losing contact with the track at the top of the loop.

To determine the height at which the block should be released so that it is on the verge of losing contact with the track at the top of the loop, we need to consider the forces acting on the block at that point. At the top of the loop, the only force acting on the block is its weight (mg), directed downwards.
To stay on the track, the net force must be inward and equal to the centripetal force required to keep the block moving in a circular path. The centripetal force is given by the equation Fc = mv^2 / r, where m is the mass of the block, v is its velocity, and r is the radius of the loop.
Since the block is on the verge of losing contact with the track, the net force at the top of the loop must be equal to zero. Therefore, the weight of the block must provide the centripetal force. Setting mg equal to mv^2 / r and solving for v, we find that v = sqrt(gr), where g is the acceleration due to gravity.
The velocity required to maintain contact with the track is the minimum velocity required to complete the loop without falling off. This minimum velocity occurs when the block is at the top of the loop. Thus, the velocity v at the top of the loop is equal to the minimum velocity required to maintain contact.
At the top of the loop, the kinetic energy of the block is converted entirely into gravitational potential energy. Therefore, we can equate the kinetic energy at the bottom of the loop (when the block is released) to the gravitational potential energy at the top of the loop. The kinetic energy is given by the equation KE = (1/2)mv^2, and the gravitational potential energy is given by PE = mgh, where h is the height above the bottom of the loop at which the block is released.
Setting KE equal to PE, we have (1/2)mv² = mgh. Since v = sqrt(gr), we can substitute this into the equation to get (1/2)m(gr) = mgh. Canceling out the mass, we have (1/2)gr = gh. Dividing both sides by g, we get (1/2)r = h.
Therefore, the block should be released at a height equal to half the radius of the loop in order to be on the verge of losing contact with the track at the top of the loop.
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The index of refraction of air, which is approximately 1.000: n_(2) = (1.000 × sin(45.0°)) / sin(17.0°). This expression will give us the index of refraction of the diamond.

To calculate the index of refraction of the diamond, we can use Snell's law, which relates the angles of incidence and refraction to the indices of refraction of the two media involved. Snell's law can be expressed as follows:

n1 × sin(θ_(1)) = n2 × sin(θ_(2))

where:

n_(1) is the index of refraction of the initial medium (in this case, air),

θ_(1) is the angle of incidence,

n_(2) is the index of refraction of the second medium (in this case, diamond),

θ_(2) is the angle of refraction.

We can rearrange the equation to solve for the index of refraction of the diamond, n_(2):

n_(2) = (n_(1) × sin(θ_(1))) / sin(θ_(2))

Given that the angle of incidence θ_(1) is 45.0° and the angle of refraction θ_(2) is 17.0°, we can substitute these values into the equation along with the index of refraction of air, which is approximately 1.000:

n_(2) = (1.000 × sin(45.0°)) / sin(17.0°)

This expression will give us the index of refraction of the diamond.

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Answer: d) the elements in two compounds switch places

Explanation: just took it

Answer:

$-27

Explanation:

madison's checking account had a balance of -$12. then she wrote a check for $15 which represents madison ´s account balance now?

a check is a withdrawal from the account so subtract:

-12 - 15 = -$27

Madison's account is over drafted by $27.

The total force on the rectangle [0,3] × [0,4] when the pressure varies as p(x,y) is given by the double integral ∬[0,3]×[0,4] p(x,y) dA.

To find the total force, we need to integrate the pressure function p(x,y) over the given rectangle [0,3] × [0,4]. The integral is represented by the symbol ∬ and the region of integration is denoted as [0,3] × [0,4]. The element dA represents the infinitesimal area of the rectangle.

By performing the double integration of the pressure function p(x,y) over the rectangle, we can determine the total force exerted. This integral takes into account the varying pressure values throughout the region and calculates their cumulative effect on the force.

The resulting value of the double integral will provide the total force on the rectangle [0,3] × [0,4] when the pressure is not constant but instead depends on the variables x and y.

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The buildings in UAE made with glazed glass is because of their low maintenance and ease of installation.

Glazed glass means the glass that is used for buildings and architectural purposes. The glass facades are specifically energy efficient and support green glazing. In UAE buildings, the majority of glazing is to achieve a shading co-efficient of 0.25 which results in high-performance glazing. Glass transmits up to 80% of natural daylight and ensures cost savings.

Glass buildings help in energy efficiency in Eastern countries. Adopting glass on buildings is not easy in Middle Eastern countries due to extreme weather conditions. But the technologies made it possible and glass become a widely used material in the Middle East.

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Answer:

a

Explanation:

Explanation:

1. the potential difference of each capacitors is the same.

Answer:

C.Forced air

Explanation:

HVAC system

"By far the most common HVAC system in modern North American homes is the forced-air system that uses a furnace with a blower fan that delivers warmed air to the various rooms of the home through a network of ducts."

So can you please mark me brainliest?

Mechanical energy is of two types,

1. Kinetic energy

2. Potential energy

When the girl is at the top of her jump, the speed of the girl becomes zero.

Thus, the kinetic energy of the girl at the top of her jump is,

where m is the mass of the girl and v is her speed,

Substituting the known values,

Thus, the kinetic energy of the girl is zero at the top of her jump.

The potential energy of the girl at the top of her jump is,

where g is the acceleration due to gravity and h is the height of the girl,

Thus, the potential energy of the girl at the maximum height is maximum.

Hence, the mechanical energy of the girl at the top is in potential energy form because her kinetic energy is zero at the top of her jump.

Answer:

I believe the answer would be kinetic energy to thermal energy.

Explanation:

Thermal energy is the heat of the brakes, and the kinetic energy would be when the car is in motion before stopping.

The distance from the ground as it was sitting at the highest point on the coaster is 127.6 m.

The distance from the ground as it was sitting at the highest point on the coaster is the highest point reached by the roller coaster and it is calculated by applying the principle of conservation of energy as follows;

Potential energy at the highest point = Kinetic energy at the lowest point

mgh = ¹/₂mv²

h = ( v² ) / ( 2g )

h = ( 50² ) / ( 2 x 9.8 )

h = 127.6 m

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Δy = (3.90 m) * (7.342 x 10^(-3) radians) ≈ 0.0287 m.

To determine the width of the first-order spectrum on a screen 3.90 m away, we need to use the formula for the angular dispersion of a diffraction grating:

Δθ = λ/d,

where Δθ is the angular dispersion, λ is the wavelength, and d is the slit spacing.

First, we need to calculate the average wavelength of the white light by taking the average of the given range:

λ_avg = (410 nm + 750 nm) / 2 = 580 nm.

Next, we need to convert the slit spacing from slits/cm to meters:

d = 7900 slits/cm = 7900 slits / (100 cm/m) = 79 slits/m.

Now we can calculate the angular dispersion:

Δθ = λ_avg / d = 580 nm / (79 slits/m) = 7.342 x 10^(-3) radians.

Finally, to find the width of the first-order spectrum on the screen, we can use the relation:

Δy = r * Δθ,

where Δy is the width of the spectrum and r is the distance from the grating to the screen. In this case, r = 3.90 m.

Δy = (3.90 m) * (7.342 x 10^(-3) radians) ≈ 0.0287 m.

Rounded to three significant figures, the width of the first-order spectrum on the screen is approximately 0.0287 m.

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Answer:

In fact, ice is slightly less reflective than water. The reflectivity is related to the refractive index (in a rather complicated way) and the refractive index of ice is 1.31 while the refractive index of water is 1.33. The slightly lower refractive index of ice will cause a slightly lower reflectivity. In both cases, the reflectivity is about 0.05 i.e. at an air/water or air/ice surface about 5% of the light is reflected.

Explanation:

Answer:

In fact ice is slightly less reflective than water. ... The net result is that much more of the light is reflected from snow. So the difference isn't anything fundamental, it's just because water is continuous while snow isn't.

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Answer:

\(8.5\frac{m}{s}\)

Explanation:

Use Kinematics:

\(v = v_0 + at\)

\(v = 3 + 1.1 * 5\)

\(v = 8.5 \frac{m}{s}\)

The value of x is 25 cm³.

Total mass = m1 + m2

m₁ = 0.8 × x =0.8x g

m₂ = 1 × 100 = 100g

Total = (0.8x + 1000)g

Total volume = (x +100)/(x+100) = 0.96

x  =   4/0.16

   = 25 cm³    

Hence, The value of x is 25 cm³.

Mass is the amount of depend in a physical body. it's also a measure of the body's inertia, the resistance to acceleration while a internet force is applied. An object's mass additionally determines the energy of its gravitational appeal to other bodies.

Mass can be exceptional understood as the quantity of count number present in any object or frame. The entirety we see round us has mass. as an instance, a desk, a chair, your bed, a football, a pitcher, and even air has mass. That being said, all gadgets are mild or heavy because of their mass.

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Jeff has created a device that can convert solar energy into electricity. This innovative technology harnesses the power of sunlight to generate electrical energy, providing a sustainable and renewable source of power.

Jeff's device utilizes photovoltaic cells to convert solar energy into electricity. Photovoltaic cells, commonly known as solar cells, are made of semiconducting materials, such as silicon, that can absorb photons from sunlight.

When sunlight hits the solar cell, it excites electrons within the material, creating an electric current. The photovoltaic cells are arranged in a panel or module, which can be connected in series or parallel to achieve the desired voltage and current levels.

To optimize the conversion of solar energy, Jeff's device may include additional components, such as a charge controller, which regulates the charging of batteries or the direct usage of electricity.

It may also feature an inverter to convert the direct current (DC) produced by the solar cells into alternating current (AC), suitable for powering appliances and feeding into the electrical grid.

Overall, Jeff's device harnesses the photovoltaic effect to transform solar energy into a usable form of electricity, providing a sustainable and renewable energy source.

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Answer:

Below

Explanation:

KE = 1/2 m v^2    just plug in the numbers given in the Q

KE = 1/2 (800 kg) (20 m/s)^2 = 160 kJ

You would need to increase the height of the piston to decrease the pressure inside the cylinder while keeping the temperature constant.

This is because the pressure and volume of a gas are inversely proportional, meaning that as one increases, the other decreases, as long as the temperature is constant. Therefore, by increasing the volume of the gas, you would be decreasing the pressure. It is important to note that this change would need to be made slowly and carefully to avoid any sudden changes in pressure or temperature.

To further explain this, when the gas is confined to a cylinder with a movable piston, the pressure of the gas is determined by the force exerted by the gas molecules on the walls of the cylinder. If the volume of the cylinder decreases, the gas molecules will have less space to move around in, and they will collide more frequently with the walls of the cylinder, resulting in an increase in pressure. Conversely, if the volume of the cylinder increases, the gas molecules will have more space to move around in, and they will collide less frequently with the walls of the cylinder, resulting in a decrease in pressure.

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Answer:

The distance covered is 5250 meters

Explanation:

Motion With Constant Acceleration

It's a type of motion in which the velocity of an object changes uniformly in time.

The change of velocities is given by the following equation :

\(v_f=v_o+at\qquad\qquad [1]\)

Where:

a   = acceleration

vo = initial speed

vf  = final speed

t    = time

The distance traveled by the object is given by:

\(\displaystyle x=v_o.t+\frac{a.t^2}{2}\qquad\qquad [2]\)

Solving [1] for a:

\(\displaystyle a=\frac{v_f-v_o}{t}\)

The car changes its speed from vo=54 Km/h to vf=72 Km/h in t=5 minutes. Let's convert all to meters and seconds.

vo=54 Km/h * 1000/3600 = 15 m/s

vf=72 Km/h * 1000/3600 = 20 m/s

t = 5 min * 60 = 300 s

Now we calculate the acceleration:

\(\displaystyle a=\frac{20-15}{300}\)

\(\displaystyle a=\frac{5}{300}\)

\(a=0.0167\ m/s^2\)

Now for the distance:

\(\displaystyle x=15*300+\frac{0.0167*300^2}{2}\)

\(\displaystyle x=4500+750=5250\)

x = 5250 m

Note: We have shown only some of the decimals for the acceleration, but we have used all the decimals stored in the calculator to present accurate results.

The distance covered is 5250 meters

Answer

A. a car coming to a stop at a traffic light

The energy of photon with the wavelength of 470 nm is 4.23 × 10 ⁻¹⁹ J. The total energy of all photons is given 2.50 J. Then the number of photons reaching our eyes is 5.93 × 10¹⁸.

According to De Broglie's dual nature of matter, light behaves as both wave and particle. If the light has the particle nature, the light particles are called photons.

The energy of one photon is E = hc/λ

Where h is the Planck's constant and c be the speed of light.

given that  λ = 470 nm

h = 6.63 × 10⁻³⁴ J. s

c = 3 × 10⁸ m/s.

Then E =  ( 6.63 × 10⁻³⁴ J. s × 3 × 10⁸ m/s ) /  (470 × 10⁻⁹ m) = 4.23 × 10 ⁻¹⁹ J.

This is the energy of one photon. If the total energy is 2.50 J. The number of photons = 2.50 J / 4.23 × 10 ⁻¹⁹ J = 5.93 × 10¹⁸.

Therefore, the number of photons reaching our eyes is 5.93 × 10¹⁸.

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