Major-league baseball outfield fences are typically about 350 feet from home plate. Home run balls need to be at least 12 feet off the ground to clear the fence. Calculate the minimum required initial velocity( in Km/hr) for a home run, for baseballs hit at angles 10, 20, 30, and 40 degrees from the horizontal.

The temperature of the countertop changes by 0.032 °C. You are preparing breakfast and slide a plate on the countertop.

The quantity of heat transferred to the countertop is given by

Q = CΔT where Q = quantity of heat transferred to the countertop = 5000 J = 5 kJ, C = heat capacity of the countertop = 158.5 kJ/°C and ΔT = temperature change of the countertop.

Since we require the temperature change of the countertop, we make ΔT subject of the formula.

So, ΔT = Q/C

So, substituting the values of the variables into the equation, we have

ΔT = Q/C

ΔT = 5 kJ/158.5 kJ/°C

ΔT = 0.032 °C. So, the temperature of the countertop changes by 0.032 °C.

You are preparing breakfast and slide a plate on the countertop. If the countertop. If the countertop is 1.05 m above the floor and it leaves the top at 0.74m/s.

Therefore, The temperature of the countertop changes by 0.032 °C. You are preparing breakfast and slide a plate on the countertop.

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The energy of the flywheel can be calculated using the equation E = \(0.5Iw^2\), where I is the moment of inertia and ω is the angular velocity.

For a flywheel with a radius of 1m and mass of 500kg, the moment of inertia is\(500 x (1m)^2 = 500 kg-m2.\) The angular velocity is 500 revolutions per minute, which is equivalent to 8.667 rad/s. Plugging these values into the equation gives us \(E = 0.5 x 500 x (8.667)^2 = 35,584.7 J.\)

The energy of a flywheel is the energy stored in the kinetic form due to its rotation. It is defined as the product of the moment of inertia and the square of the angular velocity of the flywheel.

The energy stored in the flywheel is proportional to the square of the angular velocity and is also proportional to the moment of inertia. The greater the angular velocity, the more energy is stored in the flywheel.

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Answer:

No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). ... That is why 100% efficiency in machines shall not be possible.

Answer:The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent.

Explanation:

Answer:

C

Explanation:

this is because newton's second law states that if a resultant force acts on an object, then it will accelerate in the direction of the resultant force

so if there is a non zero resultant force, it means that there is a resultant force, so for every resultant force, there is acceleration

since the equation states it

F = ma

hope this helps

please mark

Answer:

I have know idea what that means lol.

Thanks for the free points. Hope you have a fantastic rest of your life!

For this question, we are first going to need to find the charge on the plate

We can do that using the amount of electrons per plate

q = Ne = (2.9 x 10^9)(1.6 x 10^-19) = 4.654 x 10^-10 C

Now that we have the charge, we can find Area with

874940.74 = 4.654x 10^-10/A(8.85x10^-12)

A = 6.0108 x 10^-5 m^2

A = pi(d^2)/4

d = 0.00874 m = 8.748 mm

The speed of the  Toyota Corolla would have  been 143.9 mph.

The acceleration of the F-15 can be calculated as follows:

Acceleration = Velocity Change / Time = (Take-off Speed) / Time

where;

Take-off Speed = √(2dg /t²)

Take-off Speed = √(2 x  (270 ft)  x 32.2 ft/s² / (2 s)²)

T  = √(17496) = 131.6 ft/s

Acceleration = Velocity Change / Time

= (131.6 ft/s) / (2 s) = 65.8 ft/s²

We can use the same acceleration to launch the Toyota Corolla, and calculate its final velocity:

Final Velocity = Initial Velocity + Acceleration x Time

where;

Final Velocity = 0 + (65.8 ft/s²) * (2 s) = 131.6 ft/s

Finally, we can convert the velocity from feet per second to miles per hour:

Velocity (mph) = Velocity (ft/s) x (1 hour/3600 s) x (5280 ft/mile)

= 131.6 ft/s x  (1 hour/3600 s)  x (5280 ft/mile)

= 143.9 mph

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Answer:

The length of the third side is

     \(c =8.82 \  m \)

The tangent of the angle for which 6.9 m is the opposite side is

\(k = 1.256\)

Explanation:

From the question we are told that

The first side is a = 6.9 m

The second side is b = 5.5 m

Generally apply Pythagoras theorem

\(c^2 = a^2 + b^2\)

=> \(c = \sqrt{a^2 + b^2 }\)

=> \(c = \sqrt{6.9^2 + 5.5^2 }\)

=> \(c =8.82 \ m \)

From sin rule we have that

\(\frac{c}{sin(\theta )} = \frac{a}{sin (\beta )}\)

Generally from a right triangle the angle \(\theta = 90\)

So

\(\frac{8.82}{sin(90 )} = \frac{6.9}{sin (\beta )}\)

=> \(\beta = sin ^{-1}[\frac{6.9}{8.82} ]\)

=> \(\beta =51.47^o\)

Generally the tangent of the angle for which 6.9 m is the opposite side is mathematically represented as

\(k = tan (\beta )\)

       \(k  =  tan (51.47 )\)

       \(k  = 1.256\)

Answer: 0.4

Explanation:

Answer:

b. 0.4

Explanation:

Answer:

So waves are everywhere. But what makes a wave a wave? What characteristics, properties, or behaviors are shared by the phenomena that we typically characterize as being a wave? How can waves be described in a manner that allows us to understand their basic nature and qualities?

A wave can be described as a disturbance that travels through a medium from one location to another location. Consider a slinky wave as an example of a wave. When the slinky is stretched from end to end and is held at rest, it assumes a natural position known as the equilibrium or rest position. The coils of the slinky naturally assume this position, spaced equally far apart. To introduce a wave into the slinky, the first particle is displaced or moved from its equilibrium or rest position. The particle might be moved upwards or downwards, forwards or backwards; but once moved, it is returned to its original equilibrium or rest position. The act of moving the first coil of the slinky in a given direction and then returning it to its equilibrium position creates a disturbance in the slinky. We can then observe this disturbance moving through the slinky from one end to the other. If the first coil of the slinky is given a single back-and-forth vibration, then we call the observed motion of the disturbance through the slinky a slinky pulse. A pulse is a single disturbance moving through a medium from one location to another location. However, if the first coil of the slinky is continuously and periodically vibrated in a back-and-forth manner, we would observe a repeating disturbance moving within the slinky that endures over some prolonged period of time. The repeating and periodic disturbance that moves through a medium from one location to another is referred to as a wave.

Hope That Helps!!

Explanation:

The fraction of the original kinetic energy of the bullet appears as mechanical energy in the system of block-spring-bullet is 0.72 m.

Amplitude=0.72 m

KE of system=0.5*(1.8+0.06)*8.7^2=70.39 j

Conservation of momentum

0.06*270=(1.8+0.06)*v

v=8.7 m/s

conservation energy

0.5*(1.8+0.06)*8.7^2=0.5*220*x^2+(1.8+0.06)*9.81*x

x=0.72 m

Amplitude=0.72 m

Original KE of bullet = 0.5*0.06*270^2=2187j

KE of system = 0.5*(1.8+0.06)*8.7^2=70.39 j

Amplitude in physics is stated to be the maximum displacement or distance that is moved by a factor on a body that is vibrating or wave measured from its equilibrium role.

As the pendulum swings through its equilibrium point (straight down), it swings to a maximum distance away from the center.

The amplitude of a wave is related to the amount of energy it includes. An excessive amplitude wave consists of a massive amount of power; a low amplitude wave consists of a small quantity of strength. Amplitude and intensity are associated, but not equal.

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Answer:

125,000

Explanation:

The direction of the polarized light after passing the first and the second filter are the same, however the intensity of the light after passing the first and second polarizer are half and fourth of its original intensity, respectively.

Light polarization is a filter of electromagnetic waves such that it propagates into one transmission axis only.

When light passes through a polarizer, its intensity will decrease by half.

Suppose the intensity of unpolarized light is  I₀,  after passing the first polarizer, its intensity becomes:

I₁ = 1/2 . I₀

After passing the second polarizer, the intensity will further decrease by half, or:

I₂ = 1/2 . I₁

I₂ = 1/2 .1/2 . I₀ = 1/4. I₀

Since both polarizers are vertical filters, then the direction of the polarized light after passing the first and the second filter are the same.

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Given data

*The given complete set has a mass is m = 3467 kg

*The speed of the cart with a horizontal velocity relative to the floor is v_1 = 0.02 m/s

*The speed of the librarian is v_2 = 2.40 m/s

The formula for the librarian's mass (m_l) is given by the conservation of momentum as

Substitute the known values in the above expression as

Hence, the librarian's mass is m_l = 28.89 kg

The sum total of all forces which are acting on an object is known as the net force. A mass can accelerate due to the net force.

The net force is the vector sum of all the forces which act upon an object. Net force is the sum of all the forces, taking the force as a vector and two forces of equal magnitude and opposite direction will cancel each other out.

Here, r₁₂ = 0.550m and r₂₃ = 0.550m. Then the distance from the first charge to the third one will be:

r₁₃ = r₁₂ + r₂₃ = 0.550 + 0.550 = 1.1m

According to the Coulomb's law, the net force on particle q₂ will be equal to the sum of the forces on particle q₂ from the particle q₁ and q₃.

F₃+ = F₁₃ +F₂₃ = q₁q₂/r²₁₃ + k q₃q₂/r²₂₃

Where, k = 9 × 10⁹ N m²/C²

Substituting numerical values, we obtain:

F₃ = 9 × 10⁹ (-66.3 × 10⁻⁶)(-43.2 × 9 × 10⁻⁶)/ 1.45² + 9 × 10⁹ × 108 × 10⁻⁶ (-43.2 × 10⁻⁶) / 0.550²

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The gravitational force of Earth on the satellite, given that the satellite is launched into orbit 30000 km above sea level is 1.63×10³ N

The gravitaional force between two objects can be obtained by using the following formula:

F = GM₁M₂ / r²

Where

The following data were obtained from he question:

The gravitaional force can be obtained as shown below:

F = GM₁M₂ / r²

F = (6.673×10¯¹¹ × 5.4×10³ × 6.0×10²⁴) / (36400000)²

F = 1.63×10³ N

Thus, the gravitational force is 1.63×10³ N

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TRUE. When air masses of different densities collide, the less dense air mass is forced to rise through frontal lifting.

In meteorology, a front is a transition area between two air masses of different densities. The atmosphere's temperature, moisture content, and wind direction are all influenced by these air masses. The types of fronts are warm, cold, stationary, and occluded fronts. The front types are determined by the characteristics of the air masses and the direction of their movement. The types of the front are Warm front: When a warm air mass replaces a cold air mass, it is called a warm front. Warm fronts typically move more slowly than cold fronts. Cold front: A cold front happens when a cold air mass replaces a warm air mass. They have steeper pressure gradients than warm fronts, and they travel faster. Rain, thunderstorms, and cold temperatures are all common with this type of front. Stationary front: This occurs when two air masses meet and neither advances. There is a lot of rain along the stationary front. Occluded front: This is a type of front that develops when a cold front overtakes a warm front. When the cool air catches up to the warm air, an occluded front forms. The fronts can cause precipitation to fall.

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The amplified sound produced a clear, bright, and piercing sound that filled the auditorium.

Amplification involves using electronic equipment, such as microphones and speakers, to increase the volume and projection of sound.

The amplification process not only made the sound of the flute louder but also improved its clarity and brightness. The use of high-quality microphones and speakers can accurately reproduce the tonal qualities of the flute, allowing for a faithful representation of the instrument's sound.

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The full question is:

A student was preparing to perform a flute solo in an auditorium for the spring band concert. The teacher went to the back of the auditorium and discovered that the sound of the flute was going to need to be amplified for people in the back to hear the solo. The amplified sound produced ____________ that filled the auditorium.

(a) The acceleration of the system is 28.55 m/s².

(b) The tension in the rope is 285.5 N.

The acceleration of the box is determined by applying Newton's second law of motion as follows;

F(net) = ma

where

weight of 30 kg mass - force of friction due to 10 kg  = tension in the rope

Fg - μmgcosθ  = ma

(30 kg x 9.8 m/s²) - (0.1 x 10 kg x 9.8 x cos30) = 10a

294 - 8.49 = 10a

285.51 = 10a

a = 285.51/10

a = 28.55 m/s²

The tension in the rope is calculated as follows;

T = ma

T = 28.55 m/s² x 10 kg

T = 285.5 N

Thus, the acceleration of the system depends on the masses and force of friction on the blocks

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The Doppler effect is used to measure the frequency of sound waves emitted by a moving source. To find the range of sound frequencies that you would hear at a position directly above the siren, we need to consider both the Doppler shift due to the motion of the source and the motion of the observer. The formula for the observed frequency f_o is:

where v_o is the velocity of the observer, v_s is the velocity of the source, and v is the speed of sound. The maximum and minimum frequencies that you would hear are f_max  502.9 Hz and f_min  497.1 Hz. The maximum frequency is heard when the platform is moving downwards with maximum speed, and the minimum frequency is heard when the platform is moving upwards with maximum speed.

Frequency or frequency is a measure of the number of occurrences of an event in a unit of time. The most widely used unit is the hertz, indicating the number of peaks of wavelength that pass a given point per second.

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Answer: The air above the ice is cooled.

Explanation: This occurs because the ice melting is an endothermic process, which means energy is absorbed into the ice. This energy/heat is taken from the surrounding air above the pond, which cools the air.

They are maintaining their body temperature by cooling down, like dogs do, as they don't have enough sweat glands to keep them cool without panting.

Brown bears maintain body temperature by cooling as a result of panting. So, the correct option is D.

Normal human body-temperature is defined as the typical temperature range found in humans which is commonly referred to as 36.5–37.5 °C. The human body temperature varies. Temperature is known as the degree of hotness or coldness of an area or object.

When we are very hot, the blood vessels of the skin dilate to carry the excess heat to the surface of the skin. Brown bear panting ensures that cool air circulates over the moist surfaces in the mouth which helps maintain body temperature by cooling the body.

Therefore, the correct option is D.

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Answer:

from the sea towards the land

Answer:

sea to land

Explanation:

because the tide is coming in

Answer:

increased sales compared to research and development time and cost of materials

Explanation: my brain

Answer:

B i think

Explanation:

Answer:

I can tell you that the pressure in a gas in inversely proportional to the volume, so it should be reversible. So I think the volume of a gas is inversely proportional to the pressure.

Explanation:

Neap tides have the lowest tidal range.

During the neap tides, the gravitational forces of the sun and the moon are perpendicular to each other, resulting in the lowest tidal range. This occurs twice a month, during the first and third quarters of the moon. During these times, the high tides are not as high, and the low tides are not as low.

Neap tides occur because the gravitational forces of the sun and the moon partially cancel each other out, resulting in weaker tidal forces. In contrast, during the full and new moons, the gravitational forces of the sun and the moon are aligned, resulting in stronger tidal forces and higher tidal ranges, known as spring tides.

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\(\\ \sf\longmapsto 300-70.5=229.5kJ\)

We know

\(\boxed{\sf Efficiency=\dfrac{Used\:Energy}{Supplied\:Energy}\times 100}\)

\(\\ \sf\longmapsto Efficiency=\dfrac{229.5}{300}\times 100\)

\(\\ \sf\longmapsto Efficiency=\dfrac{229.5}{3}\)

\(\\ \sf\longmapsto Efficiency=76.5\%\)

Alternative sources of energy among the given options are wind power, geothermal power, and nuclear power

Alternative sources of energy are those that can be used as an alternative to traditional fossil fuels like coal, oil, and gas. They are typically more sustainable and have a lower environmental impact.

From the given options, the following are considered alternative sources of energy:

1. Wind power: Wind power harnesses the energy from the wind to generate electricity. Wind turbines capture the kinetic energy of the wind and convert it into electrical energy. This is a renewable source of energy that does not produce greenhouse gas emissions.

2. Geothermal power: Geothermal power utilizes the heat from the Earth's core to generate electricity. This energy is extracted by tapping into hot water or steam reservoirs beneath the surface. Geothermal energy is considered a clean and renewable source of power.

3. Nuclear power: Although controversial, nuclear power is considered an alternative source of energy. It involves the process of nuclear fission, where the energy released from splitting atoms is used to generate electricity. Nuclear power plants do not emit greenhouse gases during operation, but concerns regarding safety and waste disposal exist.

The most controversial form of alternative energy among the given options is nuclear power. While it does not emit greenhouse gases during operation, there are concerns about the potential risks associated with accidents and the disposal of radioactive waste.

It's important to note that other alternative sources of energy exist, such as solar power, hydropower, and biomass energy. These sources also play a significant role in reducing reliance on fossil fuels and mitigating climate change.

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Geothermal Power, Wind Power, and Nuclear Power are alternative sources of energy. They are sustainable, clean, and are replenished naturally. However, Nuclear Power, while efficient, is controversial due to the risks involved.

The three alternative sources of energy from the given options could be: a. Geothermal Power, b. Wind power, and d. Nuclear Power. Alternative energy sources are those that are replenished by ongoing natural processes over human timescales as they provide energy in a clean and sustainable way. These alternatives do not rely on fossil fuels and hence, are environment-friendly and can help mitigate issues related to carbon emission and global warming.

Among these, the most controversial form of alternative energy could be considered d. Nuclear Power. While it is a powerful and efficient source of energy, it has serious associated risks including radioactive waste disposal, environmental damage due to accidents, and potential misuse of nuclear technology.

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SinФ = w/l

SinФ = 4.33 / 5.0

Ф = arcsin 4.33/5.0

Ф = 59.99 degrees

Round to 60 degrees