a baseball dropped from the roof of a tall building takes 3.1 seconds to hit the ground. how tall is the building? [neglect friction.]

The feature that is true of both solar and wind power is (b) Both power sources produce no greenhouse gas emissions during normal operation.

This makes them a more environmentally friendly alternative to traditional fossil fuels, which emit carbon dioxide (CO2) and other harmful gases during combustion.

However, the other options are not completely accurate. Solar and wind power can be intermittent, but this does not necessarily mean that they require a backup energy source. Energy storage technologies, such as batteries or pumped hydro storage, can be used to store excess energy generated during times of high production and release it during times of low production.

Furthermore, while solar and wind power currently supply a small fraction of global energy demand, it is important to note that their usage is increasing rapidly. In fact, renewable energy sources, including solar and wind power, are projected to be the fastest-growing energy source over the next few decades.

In conclusion, solar and wind power's most significant shared feature is their ability to operate without producing greenhouse gas emissions. While they do have other characteristics that are sometimes associated with them, these features are not always completely accurate and may not apply in every circumstance.

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Explanation:

since oil needs more boiling time and a higher boiling temperature the oil would have to be in the pot longer than the water if it needs to be boiled longer that is why the blue line for oil temp. is significantly higher than that of the water temp.

power phase.

Power Training focusses on overcoming resistance but also focusses on the ability to overcome the resistance in the shortest period of time. Simply put, Power = Force x Velocity, which means power can be improved by increasing force or velocity, or using a mixed-methods approach.

Power can be defined in physics as the rate at which the body uses energy to perform useful work.

power is the time rate of doing work or delivering energy in science and engineering. It is expressed as the amount of energy transferred or work done divided by the time interval t—or W/t.

Power can be defined as the amount of work done in a unit of time at a given rate. The joules per second (J/s) unit of power in the SI is the Watt (W). Horsepower (hp), which roughly equates to 745.7 watts, is sometimes used to describe a machine's or vehicle's power.

It is described mathematically as:

P=Wt, where W denotes finished work and t denotes time.

P=I2R is yet another formula for electrical power.

I am current, and R is here.

In copper cable, the current is: The power loss per unit of length is: I = 300 A. Pl=2W/m.

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The height of the wall to protect from the ocean will be 200 meters

A structural engineer is using this table to design a wall to protect a city near the ocean the height of the wall will be 200 meters.

It is given in the graph that from 2009 to 2011 the highest peak of the ocean waves reached the height between 150 to 200 meters.

So the structural engineer should consider the data given in the graph that is more than the highest peak given in the graph so the height of the wall will be 200 meters

Thus the height of the wall to protect from the ocean will be 200 meters

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The coefficient of kinetic friction between the bag and the ground is found to be 0.0251. It represents the ratio of the frictional force to the normal force acting between them.

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Answer:

Resultant velocity = 3.11 m/s.

Explanation:

It is given that,

The velocity of a boat is 2.778 m/s due North

The velocuity of river is 1.389 m/s due east.

We need to find the resultant velocity. The angle between these two velocities is 90 degrees. The resultant is given by :

\(v=\sqrt{v_b^2+v_r^2} \\\\v=\sqrt{2.778 ^2+1.389 ^2} \\\\v=3.11\ m/s\)

So, the correct option is (a).

Hi there!

Part 1:

If the blocks are moving at a constant velocity:

∑F = 0

Begin by summing the forces acting on each block. Let the upward direction be positive.

∑F₁ = Ta - M₁g - Tb

∑F₂ = Tb - M₂g

Sum the forces:

∑F = Ta - M₁g - Tb + Tb - M₂g

∑F = Ta - M₁g - M₂g = 0

Solve for Tension A:

Ta = M₁g + M₂g (Let g = 9.8 m/s²)

Ta = 4.2(9.8) + 2.6(9.8) = 66.64 N

Now, solve for tension B using the summation of ∑F₁:

0 = Tb - M₂g

Tb = (2.6* 9.8) = 25.48 N

Part 2:

We can use the same method, but incorporate the acceleration:

∑F = Ta - M₁g - M₂g

(M₁ + M₂)a = Ta - M₁g - M₂g

(M₁ + M₂)a + M₁g + M₂g = Ta

(4.2 + 2.6)(1.2) + 4.2(9.8) + 2.6(9.8) = 74.8 N

∑F₂ = Tb - M₂g

M₂a + M₂g = Tb  = 28.6 N

Part 3:

Since the top string experiences most of the tension, we can use its equation to calculate the maximum acceleration:

∑F = Ta - M₁g - M₂g

(M₁ + M₂)a = Ta - M₁g - M₂g

a = (90 - M₁g - M₂g)/(M₁ + M₂)

a = 3.435 m/s²

The velocity of the 2 objects after the collision is 0.25 m/s in left direction.

The principle of momentum conservation asserts that momentum is never created nor destroyed but only modified by the action of forces as they are represented by Newton's equations of motion. This applies to a particular issue area.

According to principle of momentum conservation:

The velocity of the 2 objects after the collision is = total initial momentum/ total mas of the two objects

= (3.0 kg × 5.5 m/s + 9.0 kg × (-1.5 m/s))/(3.0 kg + 9.0 kg)

=  0.25 m/s.

Hence, the velocity of the 2 objects after the collision is 0.25 m/s in left direction.

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Answer:

\( \boxed{q = 1.2 \times {10}^{ - 6} C}\)

Explanation:

\(f_e = \frac{{q}^{2}k }{ {r}^{2} } \\ q = \sqrt{ \frac{f_e( {r}^{2} )}{k} } = \sqrt{ \frac{5.2(5 \times {10}^{ - 2} )^{2} }{9 \times {10}^{9} } } \\ q =\sqrt{ \frac{5.2(5 \times {10}^{ - 2} )^{2} }{9 \times {10}^{9} } } = \sqrt{ \frac{0.013}{9 \times {10}^{9} } } \\ q = 1.2 \times {10}^{ - 6} \)

Answer:

The density of the substance is

\(0.85\: \: g \: \: \: {cm}^{ - 3}\)

Hope you could get an idea from here.

Doubt clarification - use comment section.

Answer:

La fuerza ejercida sobre el piso del elevador hacia abajo es aproximadamente 1,004.075 N

Explanation:

Fuerza = Masa × Aceleración

El peso de la caja = 800 N

La velocidad hacia abajo = 5.0 m / s

Tomando la aceleración debida a la gravedad, g = 9,8 m / s²

La masa del cuerpo, m = 800 N / g = 800 N / (9,8 m / s²) ≈ 81,63 kg

La fuerza ejercida sobre el piso del ascensor durante la aceleración hacia arriba, 'N', se da como sigue;

N = m · g + m · a

a = 2,5 m / s²

∴ N = 81,63 kg × 9,8 m / s² + 81,63 × 2,5 m / s² = 800 N + 81,63 × 2,5 m / s² ≈ 1,004,075 N

La fuerza ejercida sobre el piso del ascensor hacia abajo ≈ 1,004.075 N

Answer:

545432344455555322 we 45year 7of and

Answer:true

Explanation:

Displacement is the vector representation of a change in position. It is path independent and is equivalent to the straight line distance between the start and end locations. Distance is a scalar quantity that reflects the path traveled.

the package will travel a horizontal distance of 1500 m/sec x 10.1 sec = 15,150 meters before hitting the ground. Assuming there is no air resistance, the package will travel horizontally at the same speed as the airplane, which is 1500 m/sec. The time it takes for the package to hit the ground can be calculated using the formula t = √(2h/g), where h is the initial height (500 m) and g is the acceleration due to gravity (9.8 m/s²). t = √(2(500)/9.8) = √102.04 ≈ 10.1 sec


To determine how far the package travels horizontally before hitting the ground, we need to find the time it takes for the package to fall 500 meters vertically and then use that time to calculate the horizontal distance traveled.
Step 1: Find the time it takes for the package to fall.
We'll use the free fall equation: h = 0.5 * g * t^2, where h is the height, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time.
500 = 0.5 * 9.8 * t^2
Solve for t:
t^2 = (500 * 2) / 9.8
t^2 ≈ 102.04
t ≈ √102.04
t ≈ 10.1 seconds
Step 2: Calculate the horizontal distance traveled.
Since the airplane is flying horizontally at 1500 m/s, we can multiply its speed by the time it takes for the package to fall:
Horizontal distance = speed * time
Horizontal distance = 1500 m/s * 10.1 s
Horizontal distance ≈ 15,150 meters
The package travels approximately 15,150 meters horizontally before hitting the ground.

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Answer:

When the ball goes down its mechanical energy is conserved, ust before touching the ground all the energy is kinetic

When the ball touches the floor, energy has been converted into potential and heat, by the deformation of the ball.

Explanation:

When the ball goes down its mechanical energy is conserved, this is the power energy due to the height it is converted into kinetic energy to medicad that falls, just before touching the ground all the energy is kinetic.

When the ball touches the floor, the kinetic energy is not conserved, but if we define a system formed by the ball and the floor, the amount of movement is conserved, this being an inelastic shock, because the bla and the floor are stuck, so which energy has been converted into potential and  energized and heat by the deformation of the ball.

   Consequently all the mechanical energy that the ball brings before reaching the ground was converted into potential energy and heat during the crash.

The ball of dough does not rebound after it hits the ground because its kinetic energy store decreases, ie; most of its kinetic energy is transferred to the surroundings as thermal energy and sound energy.

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Answer:

Explanation:

The other answer is correct: the act of hitting a ball with a bat creates a sound. You see the act of hitting almost immediately because light travels very fast. The sound on the other hand travels much slower. So if you sit high in the stadium, the sound has to travel for a long distance before reaching you. That is why you hear the sound after you see the ball being hit.

The rates (in liters per minute) at which water force  drains from a tank is recorded. In this case, the rates at which water is flowing out of the tank are being monitored.

The recording of these rates is essential because it allows people to determine how much water is in the tank and when it needs to be refilled.  By knowing how quickly the tank is emptying, people can decide when they need to refill it. The flow rates can be used to calculate the total volume of water that has been drained from the tank over a specific period of time. By knowing the total volume of water that has been drained, people can determine how long it will take to refill the tank

When water is flowing out of the tank, it is said to be draining. The rate at which the water is draining is typically measured in liters per minute. This measurement is important because it allows people to determine how quickly the tank is emptying.

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To the nearest tenth of a m/s, the runner's average speed is approximately 10.4 m/s.

To calculate the average speed of the runner, we'll need to follow these steps:
1. Determine the total distance traveled by the runner.
2. Determine the total time taken by the runner.
3. Calculate the average speed by dividing the total distance by the total time.
Step 1: Total distance traveled
The runner dashes 139 meters away from the starting line, then turns around and runs back, stopping at a point 28 meters away from the starting point. To find the total distance, we need to add the distance covered in both parts of the run:
First part: 139 m
Second part: 139 m - 28 m = 111 m
Total distance = 139 m + 111 m = 250 m
Step 2: Total time taken
The question states that the runner completes the entire run in 24 seconds.
Step 3: Calculate the average speed
Average speed = Total distance / Total time
Average speed = 250 m / 24 s ≈ 10.4 m/s

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Answer:

the faster an object moves the more kinetic it has. the more mass an object has, the more kinetic energy it has.

Answer:

Nedecito puntos para mi tares

From low to high frequency, a wave's wavelength increases while its frequency decreases: 0.8 km, 5 m, 7 cm, 3 m, 460 nm, and 0.02 nm. The characteristic of a wave is known as its wavelength.

A wave's wavelength is the characteristic that determines how far identical locations between two succeeding waves are separated. The Greek letter lambda () is used to represent it. Thus, the wavelength is defined as the separation between one wave's crest or trough and the following wave.

The frequency of an event is its repetitions per unit of time. As a contrast to spatial frequency, it is also sometimes referred to as temporal frequency, and as a contrast to angular frequency, it is sometimes referred to as ordinary frequency.

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Wrinkled graphene is now considered for use as electrodes in a supercapacitor due to its ability to effectively increase the inter-electrode distance and introduce a very large surface area as an electrode material. Therefore, the correct option is d.

Supercapacitors, also known as ultracapacitors or electrochemical capacitors, are energy storage devices that bridge the gap between traditional capacitors and batteries.

They store and release energy through the physical separation of charge, relying on the principle of electrostatic double-layer capacitance and pseudo capacitance.

Wrinkled graphene, with its unique structural characteristics, offers several advantages in supercapacitor applications. Firstly, the wrinkled structure of graphene allows for increased inter-electrode distance.

This increased distance effectively reduces the likelihood of dielectric breakdown, preventing the electrodes from coming into direct contact and short-circuiting the supercapacitor. It enhances the device's safety and durability.

Secondly, graphene possesses an exceptionally large surface area due to its two-dimensional structure. When graphene is wrinkled, the surface area is further amplified, creating more active sites for electrochemical reactions.

This increased surface area significantly enhances the capacitance of the supercapacitor, leading to higher energy storage capacity.

On the other hand, options c) and e) are not accurate choices. Wrinkled graphene does not introduce a highly polarizable dielectric between the electrodes.

Graphene itself does not act as a dielectric material, but rather as an electrode material. While there may be dielectric materials present in a supercapacitor, it is not a direct result of using wrinkled graphene as an electrode.

In conclusion, the utilization of wrinkled graphene as electrodes in supercapacitors offers benefits. Therefore, the correct option is d.

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361 cubic meters of habitable space was available in the skylab. None of the given options are correct.

NASA launched the first American space station, called Skylab.

The fuel tank of the Saturn SIV-B rocket stage served as the Skylab's residential quarters.

Skylab's livable capacity was large in comparison to the spacecraft that American astronauts had previously used 361 cubic meters.

Skylab offered 361 cubic meters of livable area.

Hence, none of the given options is correct.

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F_net:-

Now

Apply Newton's second law

Answer:

The escalator does more work and the elevator has a greater power output.

Explanation:

The escalator does more work on the person because it is carrying them up. It also gives the person a chance to walk up the escalator making it a little more challenging than using just an elevator. The elevator has a greater power output because it can transport a person from one floor to another in just 10 seconds where as the escalator can do it in 15.

Hope this helps!

Yes, it is possible for a fig with a mass of 0.04 kg to have a greater momentum than an elephant seal with a mass of 3,000 kg.

The sum of an object's mass and velocity is termed as its momentum. It consists of both a magnitude and a direction, making it a vector quantity.



For the given momentum K.E. is inversely proportional to the mass. Hence, the fig with a mass of 0.04 kg has lower kinetic energy. For two bodies having same kinetic energy, the lighter one has greater momentum.

Hence, Yes, it is possible for a fig with a mass of 0.04 kg to have a greater momentum than an elephant seal with a mass of 3,000 kg.

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