Sally and Misha pushed a cart toward the right with a force of 24 N each. If Jeff pushed on the cart in the opposite direction, how much force would he need to use to cause the cart to experience balanced forces? (Answer with a number)​

Answer:

which statement is true about his walk? he walked 1200m then went back 600m

Explanation:

because he walked 1200m east the 600m west so it adds up to 600

If one was given Si and GaAs (Gallium-Arsenic) at room temperature, using GaAs is better for fabricating light-emitting diodes or LED.

Although both SI and GaAs can be used as semiconductors in light-emitting diodes, it all boils down to efficiency and feasibility. The energy band gaps for both are phenomenal with the infrared wavelength of light, however, to incorporate and make use of the same with Si is tedious and is limited to only the far-near region.

The voltage drop association with photons emergence in Gallium-arsenide is 1.2V giving out an 850nm wavelength of light that lies in the invisible region of infrared light. However, with the Silicon, the voltage drop is 0.5V giving out invisible infrared light of 2040nm wavelength of light.

Thus, it's just efficient to use GaAs.

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For a 0.1-kg frog to jump to a height of 1.0 meter, it requires an energy of about 0.981 joules.

To calculate the energy required for a 0.1-kg frog to jump to a height of 1.0 meter, we need to consider the potential energy the frog gains in the process. Potential energy (PE) is the energy an object possesses due to its position relative to other objects. In this case, we are dealing with gravitational potential energy, which depends on the object's mass (m), the acceleration due to gravity (g), and the height (h) the object reaches.

The formula for gravitational potential energy is: PE = m * g * h.

For this problem, we have:

- m (mass) = 0.1 kg
- g (acceleration due to gravity) ≈ 9.81 m/s²
- h (height) = 1.0 meter

Now, plug in these values into the formula:

PE = 0.1 kg * 9.81 m/s² * 1.0 m

PE ≈ 0.981 joules

So, for a 0.1-kg frog to jump to a height of 1.0 meter, it requires an energy of about 0.981 joules. This energy will be converted from the frog's muscles into kinetic energy as the frog pushes off the ground, and then to potential energy as the frog reaches its maximum height.

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Richard has just completed his science experiment, and collected all of the data. Analyse results is the next step that Richard needs to complete.

Option C is correct.

The data must be carefully examined in this step before any conclusions can be drawn. Richard can make further observations, refine the hypothesis, and draw conclusions about the experiment with the information he has obtained from analyzing the results.

Through observation, experimentation, and analysis, the scientific method is a methodical approach to answering questions and finding solutions to problems. To further refine and validate the hypothesis, the steps can be repeated multiple times because they are iterative and adaptable.

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Answer:

united states

Explanation:

give brainiest please

Answer:

70.12312593 rounded is 70.1

Explanation:

cos-1(0.34)= 70.1

If sunlight were green, then green would be the most comfortable color to wear on a hot day. This is option b.

We know that sunlight is white because our Sun is white. Some objects will reflect most of the colors in the sunlight, which would make them appear white or pale. Some will absorb most of the colors and this would make them appear black or dark. On a hot day, white clothes reflect sunlight the most so they will be more comfortable to wear.

A red rose, for instance, is red because it reflects red color and absorbs the remaining colors.

Imagine that sunlight were green instead of white. A green object would reflect most colors while a red (the opposite color of green) object would instead absorb most colors in the sunlight. Therefore, the most comfortable color to wear on a hot day would be green if sunlight were green.

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I don't know I can't read that sorry I mean don't understand

F =

t = 0.17 s

Impulse (J) = 20,000 N

J = F x t

F = J / t = 20,000 Ns / 0.17 s = 117,647.0588 N

Answer:

spread and go up

Explanation:

like water when hot gas when cold ice when warm liquid

Answer:

2.24 seconds

Explanation:

xf = xo + vo t + 1/2 at^2

45 = 0 + 15 t  + 1/2 (4.5) t^2

   2.25 t^2 + 15t - 45 = 0              Quadratic formula shows  t = 2.24 seconds

The car takes approximately 2.25 seconds to cover a distance of 45.0 meters under the given conditions of constant acceleration.

Given data:

Initial velocity (u) = 15.0 m/s

Acceleration (a) = 4.50 m/s²

Distance (s) = 45.0 m

We can use the kinematic equation to solve for time (t) when the car covers a certain distance under constant acceleration:

S = ut + 1/2at²

Where:

s = distance

u = initial velocity

a = acceleration

t = time

Plugging in the given values:

45.0 = 15.0t + 1/2 m/s²t²

2.25t² +15t - 45 = 0

t = 2.25sec and -8.92sec

Since time cannot be negative in this context, we discard the negative solution.

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Answer:

The resulting speed of the ball is;

10 m/s

Explanation:

The given parameters are;

The amount of work done by the lever = 5.0 J

The mass of the ball on which the work is done, m = 0.10 kg

By the principle of conservation of energy, we have;

The work done by the lever = The kinetic energy. K.E., gained by the ball

The kinetic energy, K.E., is given by K.E. = 1/2·m·v²

Where, for the ball, we have;

m = The mass of the ball

v = The resulting speed of the ball

Therefore, by substituting the known values, we have;

The work done by the lever = 5.0 J = The kinetic energy. K.E., gained by the ball =  1/2 × m × v² =  1/2 × 0.10 kg × v²

∴ 5.0 J = 1/2 × 0.10 kg × v²

v² = 5.0 J/(1/2 × 0.10 kg) = 100 m²/s²

v = √(100 m²/s²) = 10 m/s

The resulting speed of the ball, v = 10 m/s.

Answer:

Also, as stream depth increases, the hydraulic radius increases thereby making the stream more free flowing. Both of these factors lead to an increase in stream velocity. The increased velocity and the increased cross-sectional area mean that discharge increases.

Answer:

b d c a

Explanation:

Answer:

3 every second

Explanation:

The typical magnification of ocular lenses, also known as eyepiece lenses, is usually 10x to 20x. Ocular lenses are a critical component of microscopes, telescopes, and other optical instruments, serving as the lens that is closest to the eye.

The magnification of the ocular lens affects the final magnification of the entire system and determines how much the image is enlarged. The typical magnification of ocular lenses is designed to provide a clear and comfortable view of the subject being observed. However, the magnification of ocular lenses can be customized depending on the intended use of the optical instrument and the user's preference.

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The speed of the wave of wavelength 0.21 m is 23.1 m/s. And the correct answer is 0A. 23.1 m/s.

The speed of a wave is calculated by multiplying the wavelength and the frequency of the wave.

To calculate the speed of the wave, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the speed of the wave is 23.1 m/s.

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The diagram is labelled to DRAW the RESULTANT wave and LABEL the areas of interference with CI, DI and/or points of TDI.

When a light ray falls on the interface of two medium like air and water, then the portion of light is reflected and another portion of the light is refracted into the water medium. The angle of incidence is equal to the angle of reflection but the angle of incidence is larger then the angle of refraction.

Open the attached file. It shows 2 waves (a blue one and an orange one) that are moving through the same medium at the same time.

Thus, the diagram is labelled.

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In summary, the frequency and angular frequency are related through a simple mathematical formula, and can be converted back and forth using this formula.

The relation between frequency f and angular frequency ω is given by:

ω = 2πf

where ω is the angular frequency in radians per second, and f is the frequency in hertz (Hz).

So, if the natural angular frequency of a mass on a spring is given as ω = 5 rad/s, then the corresponding frequency would be:

f = ω / 2π

f = 5 / 2π

f ≈ 0.795 Hz

Similarly, if the natural frequency of an inductor capacitor circuit is given as f = 100 Hz, then the corresponding angular frequency would be:

ω = 2πf

ω = 2π(100)

ω ≈ 628.3 rad/s

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ANSWER

547.5 J

EXPLANATION

Given:

• The child's mass, m = 15 kg

• The height of the slide, h = 5 m

• The velocity of the child at the bottom of the slide, v = 5 m/s

Find:

• The loss of mechanical energy due to friction

The loss of mechanical energy due to friction is the difference between the child's gravitational potential energy at the top of the slide, and the child's kinetic energy at the bottom of the slide,

Replace the known values and solve,

Hence, 547.5 Joules of energy were lost due to friction.

The surface temperature of the Sun in Kelvin to 3 significant digits is 0.127 K.

The surface temperature of the sun is determined by using the following equations as shown below;

P/A = σT⁴

I = σT⁴

where;

T⁴ = I/σ

T⁴ = (1.5 x 10⁻¹¹)/ (5.67 x 10⁻⁸)

T⁴ = 2.65 x 10⁻⁴

T = (2.65 x 10⁻⁴)^¹/₄

T = 0.127 K

Thus, the surface temperature of the Sun in Kelvin to 3 significant digits is 0.127 K.

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The distance between two lines in the grating is  0.00045 cm.

A diffraction grating is an optical element with a periodic structure used in optics that diffracts light into many beams that move in various directions. A type of structural coloring is the coloration that is emerging.

A good diffraction grating has 2210 lines/cm, that means,

The diffraction grating has 2210 lines in 1 cm.

Hence, the distance between two lines in the grating is = (1 ÷ 2210) cm

= 0.00045 cm.

Hence, the distance between two lines in the grating is  0.00045 cm.

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Answer:

zero

Explanation:

The linear momentum is conserved when the system is closed. Therefore, the net force is zero.

The smaller radius is primarily a result of the magnesium atom having a larger nuclear charge.

What is atom?

An atom is a particle of the  matter that uniquely defined as a chemical element. An atom is the  consists of a central nucleus that is the  surrounded by one or more negatively charged of  electrons. The nucleus is the  positively charged and the  contains one or more of  relatively heavy particles known as protons and neutrons.

Sol-atomic radius of an atom is defined as the total distance from the nucleus to the outermost shell of the atom.

Sodium and magnesium lies in the same period and magnesium lies to the right of sodium. They have same number of principle shell.

As moving from left to right in a period, more and more electrons get added up in the same principle shell and the attraction between the last electron and nucleus increases , which results in the larger nuclear charge and thus shrinkage in the size of an atom. Thus, decreasing the atomic radii of the atom on moving towards right of the periodic table.

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A cheetah may accelerate at a speed od 25.5 m/s within 4.00 seconds, which equals 51.

acceleration describes the speed and direction changes in velocity over time. Acceleration refers to the change in speed or direction of an item or point travelling straight forward. Due to the constant change in direction, motion on a circle accelerates even while the speed is constant.

According to Newton's Second Law on Motion, when a force applies on a mass object, acceleration occurs and speed increases. The application of the this motion law can be seen while bicycling. There is mass in your bicycle. The force is generated by the leg muscles pressing against the bicycle pedals.

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If the coefficient of friction between the block and the surface is μ. what was the speed of the clay immediately before impact:

solution:-

1st conservation of momentum

(m1 * v1i) + (m2 * v2i) = (m1 +m2) * vf

v2i = 0 m/s because the wooden block is at rest

(m1 * v1i) + (m2 * 0) = (m1 +m2) * vf

(m1 * v1i) = (m1 +m2) * vf

Equation #1

vf = (m1 * v1i) ÷ (m1 +m2)

vf is the velocity of the clay and block as they slide a distance d before coming to rest.

2nd conservation of energy.

The work of friction will reduce the kinetic energy of the clay and block to 0 Joules as the clay and block slide across the horizontal surface.

Initial Kinetic energy of the clay and block = ½ * (m1 +m2) * vf^2

Work of friction = µ * (m1 +m2) * g * d

Final KE = 0

Initial Kinetic energy of the clay and block – Work of friction = 0

[½ * (m1 +m2) * vf^2] – [µ * (m1 +m2) * g * d] = 0

[½ * (m1 +m2) * vf^2] = [ µ * (m1 +m2) * g * d]

Divide both sides by (m1 +m2)

[½ * vf^2] = [ µ * g * d]

vf^2 = [2 * µ * g * d]

Equation #2

vf = [2 * µ * g * d]^0.5

Equation #1

vf = (m1 * v1i) ÷ (m1 +m2)

set Equation #1 = Equation #2

(m1 * v1i) ÷ (m1 +m2) = [2 * µ * g * d]^0.5

Multiply both sides by (m1 +m2)

(m1 * v1i) = (m1 +m2) * [2 * µ * g * d]^0.5

Divide both sides by m1

v1i = (m1 +m2)/m1 * [2 * µ * g * d]^0.5

Speed is the gap traveled in step with unit of time.

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Answer:

A

Explanation:

They drove 30km north. The displacement adds up to 25km therefore making the distance greater

Hope this helps!

A cubic meter of lead has the greatest density among the options given. Density is the measure of how much mass is contained in a given volume of a substance. Lead is a dense metal with a density of 11.34 g/cm³, whereas snow, air, textbooks, and feathers have much lower densities.

Snow has a density ranging from 0.1 to 0.3 g/cm³, air has a density of approximately 1.2 kg/m³, textbooks have a density of around 0.8 g/cm³, and feathers have a density of around 0.02 g/cm³. Therefore, a cubic meter of lead will have a much greater mass than the other options given, despite having the same volume. It is important to note that density can vary based on factors such as temperature and pressure, but in this case, lead is the most dense material among the options given.

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