a block of mass 10kg rests on an incline of 20 degrees. The magnitude of the friction force on the block is?

Because the current surge in starting multiple motors is too great for the system, a delay between the starting of each motor is necessary.

When multiple motors start simultaneously, they draw a significant amount of current, resulting in a high inrush current that can overload the electrical system. To prevent this, a delay is introduced between the starting of each motor. This delay allows the system to stabilize and accommodate the initial surge in current before the next motor is started. By staggering the motor start times, the overall current demand is distributed more evenly, reducing the strain on the electrical system. This practice helps to prevent voltage drops, voltage fluctuations, and potential damage to electrical components. Therefore, introducing a delay between the starting of each motor is essential to ensure the proper functioning and longevity of the system.

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The energy transported by the wave increases by a factor of 9,

The energy transported by a wave is proportional to the square of its amplitude. Therefore, if the amplitude of the wave increases from 0.5 meters to 1.5 meters, the energy transported by the wave increases by a factor of

\((1.5/0.5)^2 = 9.\)

Wave amplitude is the maximum displacement or distance moved by a particle of the medium from its rest position when a wave passes through it. In simpler terms, it is the height of the wave from its equilibrium position. The amplitude is usually measured in meters (m), centimeters (cm), or sometimes in units of pressure, such as Pascals (Pa) for sound waves.

Energy transferred by a wave refers to the amount of energy that the wave carries as it travels through a medium.

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Arnold Penzias and Robert Wilson's discovery of cosmic background radiation in space, which comes from all directions, offered the first physical proof in favor of the Big Bang theory of the cosmos.

Although a hypothesis can never be proven, it must be "testable" through observation or experimentation. Despite assume significant issues, the Big Bang Theory has so far largely held up to observations and is widely regarded throughout the cosmological community.

A tiny ball of infinitely dense substance existed in the beginning. Then, everything exploded into being, creating the atoms, molecules, stars, and galaxies that we can see today.

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A ball is released from a certain height of 20m then the time taken by the ball to fall is 2 sec and the velocity is 20m/s

Here: s (height) = h =20

a=g=±10m/s

a=10m/s (since it is dropped)

\(v^{2} -u^{2} =2as\\v^{2} =2*10*10\\v^{2}= 200\)

(u=0; it is dropped not thrown)

v=20m/s

for calculating time we know,

v=u+at

20= 0+ 10xt

t=20/10

t=2seconds

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Answer:

you are going 1 mile per hour depending on how fast

Explanation:

Answer:

a) Fnet = 176.78N

b) Enet = 88.39 × 10⁵N/C

Explanation:

Hello friend! Hope you find this response helpful! :)

If you apply a force over a given distance - you have done work. Work = Change in Energy. If an object's kinetic energy or gravitational potential energy changes, then work is done. The force can act in the same direction of motion. Or, the force can act against the motion.

Answer:

an atom has 8 electrons

Explanation:

By analyzing the Sun's position information at two separate sites on the earth's surface, Eratosthenes, a Greek library in Alexandria, Egypt, discovered the moon's gravity in the third century BCE.

The solstice marks the time of year when the Sun appears to be at either its lowest or highest point in the sky. Because of this, ancients came to refer to this day as one when the Sun popped up to stand still. The word solstice is derived from the Latin words sol, which means "Sun," and sistere, which means "To Stand Still."

The Earth's axis tilts most nearly toward the sun twice a year during what are known as the solstices. The longest day is experienced in the hemisphere that is inclined closest toward our star.

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Answer:

I'm gonna say it's D

Explanation:

but when u do the experiment on in u head you'll actually find out that it is actually , indeterminable

Theodore is 170 centimeters from the finish line when Alvin crosses it.

The total distance is 451 cm, so we can find the time that takes Alvin to crosses the finish line as follows:

\( v_{a} = \frac{x}{t} \)   (1)

Where:

\( v_{a}\): is the speed of Alvin = 19.28 cm/s

x: is the total distance = 451 cm

t: is the time that takes Alvin to crosses the finish line =?

By solving equation (1) for t, we have:

\(t = \frac{x}{v} = \frac{451 cm}{19.28 cm/s} = 23.4 s\)

Now, after 23.4 seconds have elapsed, Theorode has traveled the following distance (\(x_{t}\)):

\( x_{t} = v_{t}*t \)

Where:

\(v_{t}\): is the speed of Theodore = 12 cm/s  

\( x_{t} = v_{t}*t = 12 cm/s*23.4 s = 281 cm \)

The distance (d) that Theodore needs to travel to cross the finish line is:

\(d = x - x_{t} = 451 cm - 281 cm = 170 cm\)

Therefore, Theodore is 170 centimeters from the finish line when Alvin crosses it.

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The amount of 1 US liquid gallon of water weighs approximately 268.803 pounds.

The density of water is 62.4 lbm/ft³

Formula used: Density = mass/volume

We know that, 1 US liquid gallon = 0.13368 cubic feet of volume

Therefore, the mass of 1 US liquid gallon of water can be calculated as follows:

mass = Density × volume= 62.4 lbm/ft³ × 0.13368 ft³= 8.3454048 lbm

To convert pound mass to pounds, we need to multiply it with the acceleration due to gravity (g). Therefore, the weight of 1 US liquid gallon of water can be calculated as follows:

Weight = mass × g= 8.3454048 lbm × 32.2 ft/s²= 268.80256256 lbm·ft/s² (pound force or lbf) ≈ 268.803 lbm·ft/s²≈ 268.803 lbf

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The pattern of iron fillings around the magnet depicts that like poles repel because the magnetic lined bend away from each other. Thus, option C is correct.

The North Magnetic Pole would move via magnetic field lines, which are hypothetical lines. The magnet's oppositely polarized poles attract and repel one another.

Since the magnetic field lines inside the magnet run from the south pole to the north pole, Never do magnetic field lines cross one another. A closed loop is formed by magnetic field lines.

Because magnetic force lines are bending in the direction of the south pole in the illustration, like poles repel one another. If the magnetic lines are bent away from one another, like poles repel one another.

Thus, image given has the presence of lines bending away from each other, thereby are like poles repel. Hence, option C is correct.

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Answer:

The basic properties (parts) of a wave include: frequency, amplitude, wavelength and speed. Frequency is a measure of how many waves pass a point in a certain amount of time. The higher the frequency, the closer the waves are together and the greater the energy carried by the waves will be.

Explanation:

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Answer:

200,000 joules <3

Explanation:
just accept it

Answer:

\(2.00 * 10^5J\)

Explanation:

Make use of your conversion factors:

\(200KJ * \frac{1000J}{1kJ} = 200,000J = 2.00* 10 ^5J\)

Or alternatively make use of your scientific notation. \(kilo = 10^3\)

Therefore \(200kJ = 200*10^3J=2.0*10^2*10^3J = 2.0*10^5J\)

Take into account that the momentun p is given by the following formula:

where,

m: mass = 30kg

v: speed = 20 m/s

replace the previous values into the formula for p and simplify:

The previous result is the momentum.

The driver experiences about 0.835 g, g-force during the acceleration. and the car travels about 49.8 meters (163 feet) to hit 60 mph.

What is g-force?

To calculate the g-force experienced by the driver during the acceleration, we need to use the formula:

g-force = acceleration due to gravity / acceleration of the car

The acceleration due to gravity is approximately 9.81 m/s², or 32.2 ft/s².

The acceleration of the car can be calculated by converting the acceleration from 0-60 mph to meters per second squared (m/s²). We can use the following formula to convert:

a = (v_f - v_i) / t

where:

a = acceleration

v_f = final velocity (60 mph in this case, which is 26.8 m/s)

v_i = initial velocity (0 mph in this case, which is 0 m/s)

t = time taken to reach final velocity (2.28 seconds in this case)

Plugging in the values, we get:

a = (26.8 m/s - 0 m/s) / 2.28 s

a ≈ 11.75 m/s²

Now we can calculate the g-force experienced by the driver:

g-force = 9.81 m/s² / 11.75 m/s²

g-force ≈ 0.835 g

Therefore, the driver experiences about 0.835 g during the acceleration.

To calculate the distance traveled by the car to hit 60 mph, we can use the following formula:

d = v_i * t + 0.5 * a * t²

where:

d = distance traveled

v_i = initial velocity (0 mph in this case, which is 0 m/s)

t = time taken to reach final velocity (2.28 seconds in this case)

a = acceleration (11.75 m/s²)

Plugging in the values, we get:

d = 0 m/s * 2.28 s + 0.5 * 11.75 m/s² * (2.28 s)²

d ≈ 49.8 m

Therefore, the car travels about 49.8 meters (163 feet) to hit 60 mph.

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Complete question is: The 2022 Tesla Model S Plaid can accelerate from 0-60 mph in 2.28 seconds. The driver experiences about 0.835 g, g-force during the acceleration. and the car travels about 49.8 meters (163 feet) to hit 60 mph.

When a space vehicle is launched vertically upward from the Earth's surface with an initial speed of 5.76 km/s, it will eventually reach a maximum height before falling back down due to gravity.

To determine the maximum height, we need to use the equation for the maximum height of an object in projectile motion. This equation is given by h = (v^2*sin^2(theta))/(2g), where v is the initial velocity, theta is the launch angle (which in this case is 90 degrees since the vehicle is launched vertically), and g is the acceleration due to gravity.

Plugging in the given values, we get h = (5.76^2*sin^2(90))/(2*9.81) = 165 km.

Therefore, the space vehicle will attain a maximum height of 165 km before falling back down to Earth.

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If an amplifier has an r in = 1 kω, and a coupling capacitor of value 33 μf, the approximate cutoff frequency would be 5.08Hz

So, the correct answer is C.

To find the approximate cutoff frequency of an amplifier with an input resistance (R_in) of 1 kΩ and a coupling capacitor value of 33 μF, you can use the formula: f_c = 1 / (2 * π * R_in * C)

Where f_c is the cutoff frequency, R_in is the input resistance (1 kΩ or 1000 Ω), C is the capacitance of the coupling capacitor (33 μF or 0.000033 F), and π is a mathematical constant approximately equal to 3.14159.

Plugging in the values, we get: f_c = 1 / (2 * 3.14159 * 1000 * 0.000033) f_c ≈ 4.817 Hz

The closest answer to the calculated value is 5.08 Hz (option c).

So, the approximate cutoff frequency for the given amplifier is 5.08 Hz.

Hence the answer of the question is C.

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The heliocentric model of the Universe was developed by Nicolaus Copernicus.

He proposed this model in the 16th century, suggesting that the Sun is at the center of the solar system, with the planets, including Earth, revolving around it. This was a significant departure from the prevailing geocentric model, which placed Earth at the center of the Universe. Johannes Kepler, an astronomer who came after Copernicus, made significant contributions to the understanding of planetary motion by formulating his three laws of planetary motion. Ptolemy and Aristotle were ancient Greek philosophers and astronomers, but they advocated for the geocentric model, which was eventually challenged and replaced by Copernicus' heliocentric model.

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The most important component of concentrated solar power (CSP) is mirrors, also known as heliostats. These mirrors reflect and concentrate sunlight onto a receiver, which then converts the heat into electricity. Option(d)

The mirrors are arranged in a solar field and are constantly repositioned by computer-controlled motors to track the sun's movement throughout the day. This allows the mirrors to maintain their focus on the receiver, maximizing the amount of sunlight that is captured and converted into energy. The efficiency of a CSP plant is highly dependent on the design and quality of its mirrors. The mirrors must be able to withstand extreme weather conditions and maintain their reflective properties over time. Additionally, the shape and alignment of the mirrors must be precise to ensure that the concentrated sunlight is directed onto the receiver with maximum efficiency.  

While other components such as the receiver, heat transfer fluids, and turbines are also important for converting the solar energy into electricity, the mirrors are the key component that enables CSP plants to generate large amounts of renewable energy. Option(d)

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Answer:

A bird flies 75m in 15s.Calculate its speed

Answer:

Explanation:

The gravitational potential energy of a body can be found by using the formula

GPE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 9.8 m/s²

From the question we have

GPE = 4000 × 9.8 × 20 = 784,000

We have the final answer as

Hope this helps you

First, let's find the acceleration and the final velocity in the first 20 seconds, using the formula below:

During the 10 seconds with constant speed, the distance he ran is:

Now, in the last 5 seconds, the distance is:

Therefore the total distance is:

Given:

The initial position of the bike, x_i=-300 m

The final position of the bike, x_f=900 m

The time it takes for the bike to move to the final position, t=2 min=120 s

To find:

The speed of the bike.

Explanation:

The speed of an object is the time rate of change of distance.

That is the speed of an object is given by the ratio of the distance to the time.

Thus the speed of the bike is given by,

On substituting the known values,

Final answer:

The average speed of the bike is 10 m/s

Answer:

B

Explanation:

The tension should be increased to 24.6 N in order to  produce the correct frequency of 600 Hz

To calculate this, we can use the equation T = (2*L*F^2)/(A*C), where T is the tension, L is the length of the string, F is the frequency, A is the cross-sectional area and C is the linear density of the string. We can rearrange the equation to solve for T, which gives us T = (2*L*F^2)/(A*C). Plugging in our known values, we get T = (2*L*600^2)/(A*C). Then, we can solve for the new tension by substituting our original tension and frequency into T = (2*L*500^2)/(A*C) and solving for T. The answer is 24.6 N.

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If the string produces a sound at 500 Hz when under a tension of 20.5 N, what should the tension be to produce the correct frequency of 600 Hz?