I don't know what to do so first people to answer get 30 points
also tell me your favorite football team and hockey team

Answer: When light travels from a denser to a rarer medium, the angle of incidence, whose angle of refraction is 90 degrees, is called the critical angle.

Designing investigations to predict the effect of hurricanes (D) best describes a scientific endeavor.

A scientific endeavor builds scientific knowledge by postulating theories that explains any phenomenon. It might differ from what was already known as the truth. In a scientific endeavor, a problem is first identified, observations are made, hypothesis are created based on the observations and experiments are conducted to prove the hypothesis.

The other options manly focusses on developing devices and technologies to prevent or withstand hurricanes which are examples of engineering endeavors.

Therefore, Designing investigations to predict the effect of hurricanes (D) best describes a scientific endeavor.

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sound in vacuum

Explanation:

because as u turn a vacuum on it make noise instant when u make sound from a solid object it takes a while to do thing starting slow then going fast in different objects

Answer:

The force that propels a toddler down a slide. The force that causes the moon to revolve around the Earth. The force that keeps Jupiter's moons located around the planet. The force from the moon that causes the tides of the ocean.

Explanation:

Answer: False

Explanation:

The electric motor's efficiency is 51.06%.

The majority of electric motors are made to operate between 50% and 100% of rated load. Typically, maximum efficiency is within 75% of rated load. Hence, the allowable load range for a 10-horsepower (hp) motor is between 5 and 10 hp; its peak efficiency is at 7.5 hp. Below roughly 50% load, a motor's efficiency tends to decline significantly.

To calculate the effort required to raise the object, use the formula:

Work = Force x Distance

= m x g x h (where m is the mass of the object, g is the acceleration due to gravity, and h is the height lifted)

= 34 kg x 9.81 m/s² x 11 m

= 3,769.34 J

The energy consumed by the electric motor is given as 7.4 kJ.

Therefore, the input power is:

Input power = Energy consumed / time taken

= 7.4 kJ / t

Efficiency=(Output power/Input power) x 100%

Output power = Work done/time taken

= 3,769.34 J / t

As a result, the electric motor's efficiency is:

Efficiency=(Output power/Input power)x 100%

= [(3,769.34 J / t) / (7.4 kJ / t)] x 100%

= 51.06%.

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(a) To find the tension in the connecting cord with a horizontal force of 2.3 N, identify the forces acting on the system and the horizontal force will be equal to the tension in the cord.

1. Identify the forces acting on the system. There are two forces acting on the system: the horizontal force (2.3 N) and the tension in the cord (T).

2. Since the surface is frictionless and the pulley is massless and frictionless, the horizontal force will be equal to the tension in the cord. Therefore, T = 2.3 N.

So, the tension in the connecting cord is 2.3 N.

(b) To find the largest value of the magnitude of the horizontal force without the cord becoming slack, follow these steps:

1. Identify the forces acting on the system. There are two forces acting on the system: the horizontal force (F) and the tension in the cord (T).
2. In order for the cord to not become slack, the tension in the cord must be greater than or equal to zero. Therefore, T ≥ 0.
3. Since the surface is frictionless and the pulley is massless and frictionless, the horizontal force will be equal to the tension in the cord. Therefore, F = T.
4. Since T ≥ 0, it follows that F ≥ 0.

So, the largest value of the magnitude of the horizontal force without the cord becoming slack is any value greater than or equal to zero.

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Answer:  

Periods indicate that a new period at a new principal energy level which is filled with electrons. Groups indicate that the elements share similar properties because their shells are filled with the same number of valence electons.

Explanation:  

We see that starting at period 2 Li has a  +1 charge , He has +2 charge, B has +3 charge, C has the potential to have a +4 charge or -4 charge (because it can gain or loose electrons) and N has a -3 charge, etc. Groups however, have similar properties and every element in a 1A - 8A has the same number of valence electrons. All except the noble gases in which He only needs 2 electrons to be in a perfect state. This is its octet as it would be a completely different element if it had more than 2 electrons in its shell. An example of the groups sharing similar properties is if we were to look at group 1A. In group 1A we find H, Na, K, etc. These are all highly unstable elements when alone (not in a compound) and they are very reactive. If you were to put Na for instance in water, it would light up and you'd see a flame sitting on top of the water. A scientist could do that with the rest of the elements in the group and they would see this increasing in reactivity as you go down the periods. Francium isn't visible long enough to be able to see this happen though. It's more of that kind of element that scientists prove that it exists, but not a very common element to get to learn much about.

The new force acting between the charges in terms of F is k * \(\frac{q1^{2}q2^{} }{2d^{2} }\)

Force can be defined as the an agent that orchestrate a pull or push between two subject matter.

Force is very important to every physicist and the study of physics and it has been defined by different means and different scientist

In conclusion, The new force acting between the charges in terms of F is k * \(\frac{q1^{2}q2^{} }{2d^{2} }\)

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198J minimum work is required to get the cylinder rolling without slipping at a rotational speed of 20 s−1

Work corresponds to a change in energy. So, the work required to make this cylinder roll is equal to its final kinetic energy minus its initial kinetic energy.

W=Kf−Ki

We can assume that this cylinder begins from rest, in which case Ki=0.

W=Kf

What is this cylinder's new kinetic energy? If an object is rolling, it is undergoing both rotational and translational motion. So, the cylinder's kinetic energy is equal to its translational kinetic energy plus rotational kinetic energy.

W=1/2mv2+1/2Iω²

We have values for the cylinder's mass and its rotational speed. What about its translational speed? We can use the conversion formula

v=rω and substitute this into our equation.

W=1/2m(rω)²+1/2Iω²

W=1/2mr²ω²+1/2Iω²

What about the moment of inertia? We can look up in a table that a cylinder has moment of inertia 1/2mr². Plugging this in, our equation becomes:

W=1/2mr²ω²+1/2(1/2mr²)ω²

W=1/2mr²ω²+1/4mr²ω²

W=3/4mr²ω²

Now, let's plug in values for all these variables and get our answer.

W=34(66)(0.1)2(20)2

W=198J

A solid 66 kg cylinder has a radius of 0.10 m. What minimum work is required to get the cylinder rolling without slipping at a rotational speed of 20 s−1?

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Poton-proton process, together are more massive than the helium nucleus which they make, the missing mass is converted into energy in accordance which is then released as heat and light.

The proton-proton process refers to the fusion of hydrogen nuclei that takes place in stars like the Sun, where hydrogen nuclei combine to form helium nuclei. The combined mass of the two protons during the proton-proton process is more than the resulting helium nucleus they produce. This is because during the fusion process, a small amount of mass is converted into energy in accordance with the famous equation E=mc², where E is the energy produced, m is the mass that is converted into energy, and c is the speed of light.

The missing mass is converted into energy that is released as light and heat. This is the energy that powers the Sun and other stars, and it is what makes them shine and emit heat and light. In summary, the missing mass during the proton-proton process is converted into energy in accordance with Einstein's famous equation E=mc², which is then released as heat and light.

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Answer:

an electromagnetic wave with a wavelength in the range 0.001–0.3 m, shorter than that of a normal radio wave but longer than those of infrared radiation. Microwaves are used in radar, in communications, and for heating in microwave ovens and in various industrial processes.

Whilst equatorial diameter is somewhat bigger at 7930 miles, the distance between the south and north poles is roughly 7900 miles. This gives us just a circumference of the Earth of around 25,000 miles.

Is the Earth's radius 24000 miles?

The standard measurement of the earth's circumference today is 40,096 km (24,901 miles).

How do the ancient Greeks determine the circumference of the Earth?

800 kilometers, or 5,000 stades, separated the two cities when Eratosthenes employed a man to time the distance between them. The Earth's circumference can therefore be calculated using straightforward ratios; as 7.2 degrees is 1/50 or 360 degrees, 800 multiplied by 50 = 40,000 kilometers.

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Whilst equatorial diameter is somewhat bigger at 7930 miles, the distance between the south and north poles is roughly 7900 miles. This gives us just a circumference of the Earth of around 25,000 miles.

Is the Earth's radius 24000 miles?

The standard measurement of the earth's circumference today is 40,096 km (24,901 miles).

How do the ancient Greeks determine the circumference of the Earth?

800 kilometers, or 5,000 stades, separated the two cities when Eratosthenes employed a man to time the distance between them. The Earth's circumference can therefore be calculated using straightforward ratios; as 7.2 degrees is 1/50 or 360 degrees, 800 multiplied by 50 = 40,000 kilometers.

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Answer:

I know I'm late but...

Explanation:

A mixture is the combination of two or more substances together. And I'm pretty sure that a mixture has no chemical substances. And mixtures can be physically separated.

Hope this helps you!

Stay safe and have a wonderful day/night!! :)

Please give brainliest to the person above!!!!!

Aswer:

False, the values ​​of the distance traveled and the displacement only coincide when the trayectorie is a straight line. Otherwise, the distance will always be greater than the offset.

Although these terms are used synonymously in other cases, they are totally different. Since the distance that a mobile travels is the equivalent of the length of its trajectory. Whereas, the displacement will be a vector magnitude.

xXCherryCakeXx.

The final force on the rock was smaller than the original force from the person and the distance the rock traveled was smaller than the original distance the lever moved, but the total work remained the same.

Lever is a simple machine, that allow users to exert less force while performing work.

Therefore, the lever will enable the person to lift the rock with a lesser force.

According to law of conservation of energy, the total work done during the process must be zero. Therefore, the total work will be remained constant.

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The net force is (40 Newtons) (down the road).

But 40 Newtons is not going to move a piano very enthusiastically.

Answer:

It is the law of f=ma because the lighter the trolley is, the easier it is to push it, because it doesn't have as much mass,

Explanation:

Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day :)

Answer:

Answer: Weight = 520 N

Explanation:

Weight = mass × acceleration

\({ \rm{weight = 52 \times 10}} \\ \\ { \rm{w = 520 \: newtons}}\)

Answer:

520 N

Explanation:

weight is 520 N.....

The velocity of the water at the given points (2.0, 4.0) is approximately 5.06 m/s.

To find the velocity of the water at the point (2.0, 4.0), we need to calculate its components: the horizontal velocity (v_x) and the vertical velocity (v_y).

Given that v_x is constant at 5.0 m/s, the horizontal velocity component remains the same regardless of the position.

To find the vertical velocity component, we can differentiate the equation for the path of the water with respect to x:

y = 4.0 + 0.8x - 0.40x^2

Differentiating both sides with respect to x:

dy/dx = d/dx (4.0 + 0.8x - 0.40 \(x^2\))

= 0 + 0.8 - 0.80x

Now, substitute the x-coordinate of the point (2.0, 4.0) into the derivative:

dy/dx at x = 2.0 = 0.8 - 0.80(2.0)

= 0.8 - 1.6

= -0.8 m/s

Therefore, the vertical velocity component (v_y) at the point (2.0, 4.0) is -0.8 m/s.

To find the resultant velocity (v) at that point, we can use the Pythagorean theorem:

v = \(\sqrt{v_x^2 + v_y^2}\)

\(= \sqrt{5.0^2 + (-0.8)^2}\)

\(= \sqrt{25.0 + 0.64}\)

\(= \sqrt{25.64}\)

\(\approx 5.06 , \text{m/s}\)

Hence, the velocity of the water at the point (2.0, 4.0) is approximately 5.06 m/s.

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Answer:

1. wisest

2. more delicious

3. majestic (not sure about this one)

4. industrious

5. happiest

Answer:

the amount of each charge and the distance between them. ... Coulomb's law states the the electric force between two charges is proportional to the product of the two charges and inversally proportional to the square distance that separates their centers.

In order to determine the average distance traveled by the car and the washer from the top of the track, we would need additional information or context about the specific scenario or experiment. The average distances traveled would depend on factors such as the length of the track, the initial conditions of the car and washer, and any forces or obstacles affecting their motion.

Without specific details, it is not possible to calculate the average distances traveled. However, in a typical scenario, the average distance traveled by an object can be calculated by taking the total distance traveled and dividing it by the number of trials or instances of measurement.

If you can provide more information about the track, the initial conditions, or any constraints imposed on the car and washer, I can help you calculate the average distances traveled.

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Answer:

36m would be the correct answer

The satellite is 8.02 × 10⁵ m above Earth's surface.

Let H be the height above the surface of the Earth; since we know that the satellite is rotating around the Earth due to the gravitational pull of the planet, we may assert

Procedure to solve:

F = mv²/R+H

H = mv²/F - R

H = (1160 × 7446²/8955 - 6.38 × 10⁶)

M = 8.02 × 10⁵ m

About centripetal force:

The force applied to an item that is in velocity of  curved motion that is pointed toward the axis of rotation or the centre of curvature is known as a centripetal force.

The centripetal force formula is given as the product of mass (in kg) and tangential velocity (in meters per second) squared, divided by the radius (in meters) that implies that on doubling the tangential velocity, the centripetal force will be quadrupled. Mathematically it is written as:

F = mv²/r

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Answer:

8.02x 10^5 m

Explanation:

quiz

This question involves the concept of Colomb's Law and electrostatic force.

The electrostatic force will be "0.2 N".

According to Colomb's Law, every charge exerts an electrostatic force on the other charge, which is directly proportional to the product of the magnitudes of both the charges and inversely proportional to the square of the distance between them.

\(F=\frac{kq_1q_2}{r^2}\)

where,

In case of +2 C charges:

Therefore,

\(0.1\ N = \frac{(9\ x\ 10^9\ N.m^2/C^2)(2\ C)(2\ C)}{r^2}\\\\r^2=\frac{(9\ x\ 10^9\ N.m^2/C^2)(2\ C)(2\ C)}{0.1\ N}\\\\r^2=3.6\ x\ 10^{11}\ m^2\)

Now, for the second case:

Therefore,

\(F=\frac{(9\ x\ 10^9\ N.m^2/C^2)(2\ C)(4\ C)}{3.6\ x\ 10^{11}\ m^2}\)

F = 0.2 N

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The main driving force thought to be behind the slowing of the Gulf Stream is believed to be climate change. As the atmosphere and oceans warm, the Gulf Stream is losing heat to the atmosphere.

The Gulf Stream is a powerful ocean current that originates in the Gulf of Mexico and flows northward along the eastern coast of the United States. It is part of the North Atlantic gyre, a system of circulating ocean currents. The Gulf Stream is an important part of the global conveyor belt, a system that helps regulate the ocean's climate by transporting warm tropical waters to cooler regions of the world. The Gulf Stream is so powerful that it is able to move more water than all of the world's rivers combined. It transports more than 100 million cubic meters of water per second and has a maximum speed of up to 5.6 km per hour.

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Answer:

C. reduces friction

Explanation:

Soapy water between surfaces reduces friction.