1. A pinball bangs against a bumper, giving the ball a speed of 42 cm/s. If the ball has a mass of 50.0 g, what is the ball’s kinetic energy in joules?

The fastest pitch ever thrown was 105 MPH. Hope this helps!

Final answer:

The fastest baseball pitch ever thrown was 160.0 km/h.

Explanation:

Nolan Ryan, a legendary professional baseball player, holds the record for the fastest baseball pitch ever thrown, clocking in at an astonishing speed of 160.0 km/h. Ryan's remarkable achievement showcases the pinnacle of pitching prowess in the world of baseball. His exceptional skill and athleticism have left an indelible mark in sports history, inspiring awe and admiration among fans and fellow athletes alike.

The record-setting pitch not only reflects the physical prowess of a seasoned pitcher but also serves as a testament to the dedication, precision, and power that define the elite echelons of professional baseball. Ryan's feat remains a remarkable benchmark in the annals of the sport, highlighting the unparalleled speed and precision achievable in the art of pitching.

Answer:

The kinetic energy is not conserved

Explanation:

The difference between an elastic and an inelastic collision is the following:

- In an elastic collision, both the total momentum and the total kinetic energy of the system are conserved

- In an inelastic collision, the total momentum of the system is conserved, while the total kinetic energy is not. The reason for that is that during the collisions between the objects involved in the system, part of the total kinetic energy is dissipated (mainly as thermal energy, heat) due to frictional forces acting between the objects/between the objects and the surfaces.

Therefore, the correct answer is

The kinetic energy is not conserved

Using the principle of conservation of energy, we can determine that Tarzan's speed at the bottom of his swing is 21.7 m/s.

The physics problem you have revolves around concepts of kinematics, potential energy and kinetic energy. The total energy in a closed system is conserved. Tarzan's potential energy, when he's at the top of his swing, gets converted to kinetic energy when he is at the bottom of his swing. This fundamental principle is due to the law of conservation of energy.

We can use the potential energy to solve for Tarzan's speed at the bottom of the swing. Tarzan's height, h, at the top of the swing can be found from the equation for the length of the vine and cos(37 degrees) - h = 30m * cos(37), which gives 23.9m. Initially, the total energy is just potential energy, E = m * g * h, and finally just kinetic energy, K = 1/2 * m * v^2.

Equating these two (E=K) gives us m * g * h = 1/2 * m * v^2. The mass cancels and we solve for the speed, v = sqrt(2 * g * h). Using 9.8 m/s^2 for g and 23.9m for h, we can find that v = 21.7 m/s. So Tarzan's speed at the bottom of his swing is 21.7 m/s.

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Tarzan's speed at the bottom of his swing, given a vine length of 30 m and swing angle of 37 degrees, would be roughly 9.4 m/s. This calculation is based on the principles of conservation of energy and pendulum motion in physics.

The subject of this question deals with the concepts of physics, specifically pertaining to pendulum motion and the conservation of energy. Tarzan's speed at the bottom of his swing can be calculated using potential and kinetic energy principles.

When Tarzan is at the top of his swing, all of his energy is gravitational potential energy. As he swings downwards, this potential energy transfers to kinetic energy, which is the energy of movement. The total energy in the system remains constant due to conservation of energy.

The equation we'll use to find Tarzan's speed comes from setting the gravitational potential energy equal to the kinetic energy at the bottom of his swing, thus: mgh = 1/2 * m * v^2. Here, 'm' is the mass (which actually cancels out), 'h' is the height fallen, 'g' is acceleration due to gravity, and 'v' is the speed we want to find. As Tarzan starts at rest, his potential energy is mgh where h = L(1 – cosθ).  We substitute this height into the previous expression solved for speed to get:

v = sqrt(2gh) = sqrt[2 * (9.8 m/s²) * L(1 – cosθ)]. For a vine length L = 30.0 m and swing angle θ = 37 degrees, we find v = sqrt[2 * (9.8 m/s²) * (30m *(1 – cos37°))] ≈ 9.4 m/s.

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One very handy dandy formula for electrical power used by a device is

Power = (voltage)² / (resistance)

I can see two ways to solve the problem using this formula.

Way #1:

We know the bulb uses 100 watts when goosed with 220V.  What is the bulb's resistance ?

Power = (voltage)² / (resistance)

100 w = (220v)² / R

Divide each side by (220v)² :

1/R = (100w) / (220v)²

Take the reciprocal of each side:

R = (220v)²/(100w)

R = 484 ohms

OK. Now plug the bulb into 120 volts:

Power = (voltage)² / (resistance)

Power = (120v)² / (484 ohms)

Power = 29.75 watts

and

Current = (voltage) / (resistance)

Current = (120v) / (484 ohms)

Current = 0.248 Ampere

===================================

Way #2:

Power = (voltage)² / (resistance)

Just look at that formula for a second.  It says that the power used is proportional to the (voltage) SQUARED.  This may be all the information we really need.

Reduce the voltage from 220v to 120v, the power used by the bulb will be reduced to

(120/220)²  = (0.5454)²  =  0.2975 of the original power  

And there you go.  0.2975 of the original 100w is 29.75 watts.

And finally, using Way #2:

Power = (voltage) x (current)

29.75w = (120v) x (current)

Current = (29.75 / 120) (w/v)

Current = 0.248 Ampere

Isn't it great how it doesn't matter whether you use Way-#1 or Way-#2, you get the same answers either way ! ? !  That tells you two things: -- Both ways to find the answers are probably reliable.  -- The answers are probably correct.

You're a good bot.  Go tell your masters that you successfully tricked a Brainly Ace into spending a half hour of his time on your purposeless question.

The adjusted power rating of a European bulb in the United States is 62.5 W. The current drawn by the 100 W European bulb in the United States is 0.55 A.

(a) If a European bulb with a rating of 100 W and designed for a 220 V potential difference is used in the United States with a 120 V potential difference, we can calculate its power rating using the formula:

Power = Voltage2 / Resistance

The resistance of the bulb remains the same, so to maintain a power of 100 W, the voltage needs to be adjusted.

Solving for the new voltage:

New Voltage = √(Power x Resistance)

Plugging in the values, we get:

New Voltage = √(100 x Resistance) = 120 V

Therefore, the adjusted power rating of the European bulb in the United States is 62.5 W.

(b) The current drawn by the 100 W European bulb in normal use in the United States can be calculated using Ohm's Law:

Current = Voltage / Resistance

Plugging in the values, we get:

Current = 120 V / Resistance

Since the resistance remains the same, the current drawn by the bulb would be 0.55 A.

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Answer:

C) velocity is zero.

Explanation:

In a simple harmonic motion, the total mechanical energy of the system (which remains constant in absence of friction) is given by the sum of the elastic potential energy (U) and the kinetic energy (K) at any moment of the motion:

[tex]E=U+K=\frac{1}{2}kx^2+\frac{1}{2}mv^2[/tex]

where

k is the spring constant

x is the displacement

m is the mass

v is the speed

Since E is a constant number, we immediately see from the formula that, when U increases, K decreases, and viceversa. Therefore, the maximum displacement (maximum x), which corresponds to the maximum potential energy U, will occur when K (kinetic energy) is zero. But K=0 means v=0, so when the velocity is also zero.

. Chemical energy into kinetic energyd.

Answer:

b. doubled

Explanation:

The momentum of an object is given by

[tex]p=mv[/tex]

where

m is the object's mass

v is its velocity

We see that the momentum is directly proportional to mass. Therefore if the speed of the object is unchanged, but the mass is doubled: m' = 2m, the new momentum will be

[tex]p'=m' v=(2m v)=2 (mv) = 2 p[/tex]

so the momentum is doubled.

Transverse waves In transverse waves, particles of the medium vibrate to and from in a direction perpendicular to the direction of energy

Hope this answer helps you

The transverse wave carries the energy in the right angle of the direction of the wave's advances.

Therefore, the transverse wave carries the energy in the right angle of the direction of the wave's advances.

Learn more about Transverse waves:

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Answer:

[tex]1.01\cdot 10^8[/tex] vibrations per second

Explanation:

The frequency of a wave corresponds to the number of vibrations per second:

[tex]f=\frac{N}{1 s}[/tex] (1)

where N is the number of vibrations per second.

In this problem, the frequency of the radio wave is

[tex]f=101 MHz =1.01\cdot 10^8 Hz[/tex]

And substituting into eq.(1), we find N:

[tex]N=f \cdot (1 s)=1.01\cdot 10^8[/tex]

Answer: B) The change in pitch heard as an ambulance approaches you.

Explanation:  Don't ask me.

Answer:

B

Explanation:

Doppler effect is about the apparent change in frequency. The change in pitch heard as an ambulance approaches you is an example of this

The magnitude charge creates a 1.0 n/c electric field at a point 1.0 m away 1.12×10⁻⁹ C.

The influence or force that a charged particle feels in the presence of other charged particles is described by the fundamental idea in physics known as an electric field. It is a force field that surrounds electric charges and fills the entire universe. Electric charges produce electric fields, which radiate outward in all directions from those charges.

Given:

Electric field, E = 1 N/C

Distance, d = 1 m

The electric field is given as:
E = (kQ)/r²

Q = (Er²)/k

Q = (1×1²)/(9×10⁹)

Q = 1.12×10⁻⁹ C.

Hence, the magnitude charge creates a 1.0 n/c electric field at a point 1.0 m away 1.12×10⁻⁹ C.

To learn more about the Electric field, here:

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Seafloor spreading, Crust becomes molten rock, Crust is formed, all of them I think

Answer:

seafloor spreading occurs. Denser plates slide under the lighter plates.

Explanation:

The oceanic crust bends deep inside and forms deep ocean trenches. The crust here actually sinks into mantle under continental crust  through the process called subduction which lasts for million of years. Subduction occurs due to oceanic crust being denser than continental crust.

Proteins in our body are assembled according to the instructions encoded in our DNA. The sequence of amino acids dictates the structure and function of the protein.

Proteins in our body are assembled according to the instructions encoded in our DNA. Each gene in the DNA molecule codes for the specific order of amino acids that make up a protein. The sequence of amino acids dictates the structure and function of the protein. Scientists have determined the amino acid sequences and three-dimensional conformation of numerous proteins, providing important insights into how they perform their specific functions in the body.

D. 3600 N

Mechanical advantage is the ratio of force output from a machine divided by the force input into the machine.

That is;

Mechanical advantage = Output Force/Input Force

In this case;

Input force = 800 N

Thus;  Output force = M. A × input force

                                 = 4.5 × 800

                                 = 3600 N

Therefore; the output force by the machine is 3600 N

LASIK, or "laser-assisted in situ keratomileusis," is the most commonly performed laser eye surgery to treat myopia (nearsightedness), hyperopia (farsightedness) and astigmatism.

Like other types of refractive surgery

, the LASIK procedure reshapes the cornea to enable light entering the eye to be properly focused onto the retina for clearer vision.

In most cases, laser eye surgery is pain-free and completed within 15 minutes for both eyes. The results — improved vision without eyeglasses or contact lenses — can usually be seen in as little as 24 hours.

If you're not a good LASIK candidate, a number of other vision correction surgeries are available, such as PRK and LASEK laser eye surgery and phakic IOL surgery. Your eye doctor will determine if one of these procedures is suitable for your condition and, if so, which technique is best.

LASIK surgery uses an excimer laser with a wavelength of 193 nm, which is in the ultraviolet section of the electromagnetic spectrum. The strong absorption of this wavelength allows for greater accuracy in reshaping the cornea while minimizing damage to the lens and retina of the eye.

An excimer laser used in LASIK surgery emits electromagnetic radiation with a wavelength of 193 nm. This wavelength places the laser in the ultraviolet section of the electromagnetic spectrum.

The strong absorption of the 193 nm wavelength by corneal tissue allows the laser to deliver its energy precisely to a thin layer of the cornea, resulting in greater accuracy in reshaping the cornea to correct vision defects. The concentrated energy in the thin layer ensures that only the desired tissue is ablated, limiting damage to the lens and retina of the eye.

Answer:

D) Q/2

Explanation:

The relationship between charge Q, capacitance C and voltage drop V across a capacitor is

[tex]Q=CV[/tex] (1)

In the first part of the problem, we have that the charge stored on the capacitor is Q, when the voltage supplied is V. The capacitance of the parallel-plate capacitor is given by

[tex]C=\frac{\epsilon_0 A}{d}[/tex]

where [tex]\epsilon_0[/tex] is the vacuum permittivity, A is the area of the plates, d is the separation between the plates.

Later, the voltage of the battery is kept constant, V, while the separation between the plates of the capacitor is doubled: [tex]d'=2d[/tex]. The capacitance becomes

[tex]C'=\frac{\epsilon_0 A}{d'}=\frac{\epsilon_0 A}{2d}=\frac{C}{2}[/tex]

And therefore, the new charge stored on the capacitor will be

[tex]Q'=C'V=\frac{C}{2}V=\frac{Q}{2}[/tex]

Answer:

d. Longitudinal and mechanical

Explanation:

i'm pretty sure

Sound waves are correctly described as longitudinal and mechanical. They require a medium to travel, making them mechanical, and vibrate in the same direction as the wave's movement, making them longitudinal.

The correct set of terms that describes sound waves is Longitudinal and mechanical. Sound waves are mechanical because they require a medium (like air, water, or a solid substance) in order to travel. They are also longitudinal because the medium's particles vibrate parallel to the direction of the energy transport. This back and forth motion in the same direction of the wave causes compressions (high pressure) and rarefactions (low pressure) within the medium.

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a. 2.9 s

First of all, we can assume that the light of the lightning reaches us instantaneously, since the speed of light is very large and so light takes a negligible time to reach us.

Secondly, the speed of sound in air is

[tex]v=340 m/s[/tex]

So, the difference in time between the moment we see the flash of the lightning and the moment we hear the thunder is simply given by the time it takes for the sound wave to cover the distance of  d = 1 km = 1000 m, so:

[tex]t=\frac{d}{v}=\frac{1000 m}{340 m/s}=2.9 s[/tex]

b. 4.7 s

This part of the exercise is exactly identical to the previous one, except for the fact that this time the distance that the sound should cover is

d = 1.6 km = 1600 m

Therefore, the time difference is

[tex]t=\frac{d}{v}=\frac{1600 m}{340 m/s}=4.7 s[/tex]

C play all the songs on shuffle. entropy has to do with randomness

Answer:

play all the songs on shuffle APEX

Explanation:

(a) [tex]1.72\cdot 10^{-5} \Omega m[/tex]

The resistance of the rod is given by:

[tex]R=\rho \frac{L}{A}[/tex] (1)

where

[tex]\rho[/tex] is the material resistivity

L = 1.20 m is the length of the rod

A is the cross-sectional area

The radius of the rod is half the diameter: [tex]r=0.570 cm/2=0.285 cm=2.85\cdot 10^{-3} m[/tex], so the cross-sectional area is

[tex]A=\pi r^2=\pi (2.85\cdot 10^{-3} m)^2=2.55\cdot 10^{-5} m^2[/tex]

The resistance at 20°C can be found by using Ohm's law. In fact, we know:

- The voltage at this temperature is V = 15.0 V

- The current at this temperature is I = 18.6 A

So, the resistance is

[tex]R=\frac{V}{I}=\frac{15.0 V}{18.6 A}=0.81 \Omega[/tex]

And now we can re-arrange the eq.(1) to solve for the resistivity:

[tex]\rho=\frac{RA}{L}=\frac{(0.81 \Omega)(2.55\cdot 10^{-5} m^2)}{1.20 m}=1.72\cdot 10^{-5} \Omega m[/tex]

(b) [tex]8.57\cdot 10^{-4} /{\circ}C[/tex]

First of all, let's find the new resistance of the wire at 92.0°C. In this case, the current is

I = 17.5 A

So the resistance is

[tex]R=\frac{V}{I}=\frac{15.0 V}{17.5 A}=0.86 \Omega[/tex]

The equation that gives the change in resistance as a function of the temperature is

[tex]R(T)=R_0 (1+\alpha(T-T_0))[/tex]

where

[tex]R(T)=0.86 \Omega[/tex] is the resistance at the new temperature (92.0°C)

[tex]R_0=0.81 \Omega[/tex] is the resistance at the original temperature (20.0°C)

[tex]\alpha[/tex] is the temperature coefficient of resistivity

[tex]T=92^{\circ}C[/tex]

[tex]T_0 = 20^{\circ}[/tex]

Solving the formula for [tex]\alpha[/tex], we find

[tex]\alpha=\frac{\frac{R(T)}{R_0}-1}{T-T_0}=\frac{\frac{0.86 \Omega}{0.81 \Omega}-1}{92C-20C}=8.57\cdot 10^{-4} /{\circ}C[/tex]

(a) -17 cm

Magnification equation:

[tex]\frac{h_i}{h_o}=-\frac{q}{p}[/tex]

where

[tex]h_i[/tex] is the size of the image

[tex]h_o[/tex] is the size of the object

[tex]q[/tex] is the distance of the image from the mirror

[tex]p[/tex] is the distance of the object from the mirror

In this problem, we have:

p = 51 cm (the object is 51 cm in front of the mirror)

[tex]\frac{h_i}{h_o}=\frac{1}{3}[/tex]

So, we can find q, the image distance:

[tex]q=-\frac{h_i}{h_o}p=-\frac{1}{3}(51 cm)=-17 cm[/tex]

and the negative sign means the image is virtual.

(b) -25.5 cm

Mirror equation:

[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]

where

p = 51 cm

q = -17 cm

Substituting and re-arranging the equation, we find the focal length of the mirror:

[tex]\frac{1}{f}=\frac{1}{51 cm}-\frac{1}{17 cm}=-\frac{2}{51 cm}\\f=-\frac{51 cm}{2}=-25.5 cm[/tex]

and the negative sign is due to the fact it is a convex mirror.

OK.  I would build it the same shape and size as a microwave oven, but I would leave out all the normal electronics.

In the side compartment, in place of the electronics, at the top, I would put a little gas flame, like a Bunsen burner.  In the bottom of the side compartment, I would put a treadmill with two strong hamsters.  Then, I would install ductwork in the compartment so that when the hamsters turn the wheel, some fan-blades along the rim of the wheel would blow the hot air from the gas flame down and into the big food compartment.  This would warm the left-overs WITHOUT using electricity from the wall outlet, and without spraying any hazardous high-power RF energy into the kitchen.  

When the object is lifted 6 meters of the ground , then lifted to 12 meters, it is lifted twice as high ( 6 x 2 = 12).

This means the potential energy is also doubled.

The potential energy of an object lifted 12 meters off the ground, as opposed to 6 meters, would double, assuming the gravitational field strength and the object's mass stay constant.

When discussing potential energy, specifically gravitational potential energy, it is directly related to the height of an object from a reference point, generally the ground. In this scenario of an object being lifted 12 meters instead of 6 meters, the potential energy of the object would essentially double. Gravitational potential energy is calculated as the product of the mass, the gravitational field strength, and the height (PE = mg). As the height is doubled, the potential energy would also double assuming the mass of the object and gravitational field strength remain constant.

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Answer:

A) The current increases

Explanation:

In the DC limit (that means, very low frequency of the generator), the capacitor acts as an open circuit. In fact, a capacitor consists of two parallel plates which are separated from each other: this means that the current cannot flow through it, but it can only flow through the rest of the circuit.

In the case of a direct current (DC), therefore, the current in the circuit must be zero. For an AC current with very low frequency, the current is still very low, because the polarity of the generator changes direction not very often, so there is still enough time for the capacitor to "block" the current. However, when the frequency of the generator is increased, the polarity changes so fast that the current in the circuit can flow without having time of "hitting" the capacitor, so it has almost no effect and the current in the circuit is maximum.

April 8, 2024

Eclipse will be total over the southern part of the state.  Roughly everything south of Decatur and Springfield.

Answer:

6 W

Explanation:

The work done by the force is equal to:

[tex]W=Fd[/tex]

where

F = 4 N is the force exerted

d = 3 m is the displacement

Substituting,

[tex]W=(4 N)(3 m)=12 J[/tex]

The power is equal to the ratio between work done and time taken:

[tex]P=\frac{W}{t}[/tex]

where

W = 12 J is the work done

t = 2 s is the time

Substituting,

[tex]P=\frac{12 J}{2 s}=6 W[/tex]

The power required is 6 Watts.

The question is asking us to calculate the power required to exert a 4-N force over a distance of 3 meters in 2 seconds. To find the power, we can use the formula:

Power = Work / Time

Where work (W) is calculated by:

Work = Force x Distance

In this case, the work done is:

Work = 4 N x 3 m = 12 J (joules)

Now, we divide the work by the time to find the power:

Power = 12 J / 2 s = 6 Watts

Answer:

Zero

Explanation:

The work done on an object is given by:

[tex]W=Fd cos \theta[/tex]

where

F is the force applied on the object

d is the displacement of the object

[tex]\theta[/tex] is the angle between the direction of the force and the displacement

In this problem, you are pushing again a stationary wall: this means that the walls does not move. As a result, the displacement is zero: d=0. Therefore, the work done is also zero: W=0.

1) c. 2 m/s

Explanation:

The relationship between frequency, wavelength and speed of a wave is

[tex]v=\lambda f[/tex]

where

v is the speed

[tex]\lambda[/tex] is the wavelength

f is the frequency

For the wave in this problem,

f = 4 Hz

[tex]\lambda=0.5 m[/tex]

So, the speed is

[tex]v=(0.5 m)(4 Hz)=2 m/s[/tex]

2)  a. 2.8 m/s

The speed of the wave on a string is given

[tex]v=\sqrt{\frac{T}{\mu}}[/tex]

where

T is the tension in the string

[tex]\mu[/tex] is the linear mass density

In this problem, we have:

[tex]T=2 \cdot 4 N=8 N[/tex] (final tension in the rope, which is twice the initial tension)

[tex]\mu = 1 kg/m[/tex] --> mass density of the rope

Substituting into the formula, we find

[tex]v=\sqrt{\frac{8 N}{1 kg/m}}=2.8 m/s[/tex]

Answer:

0.017 s

Explanation:

The period of a periodic signal is defined as the reciprocal of the frequency:

[tex]T=\frac{1}{f}[/tex]

where

T is the period

f is the frequency

For the electrical power, the frequency is

f = 60.0 Hz

Substituting into the previous equation, we find the period:

[tex]T=\frac{1}{60.0 Hz}=0.017 s[/tex]

The period of 60.0 Hz electrical power is 0.0167 seconds, calculated by taking the inverse of the frequency.

The period of an electrical power wave, such as that with a frequency of 60.0 Hz, can be found by taking the inverse of the frequency. In this case, the frequency is 60.0 Hz, meaning the power wave completes 60 cycles per second. To find the period of this electrical power, we use the formula Period (T) = 1/frequency (f), where 'f' is in hertz (Hz). Thus, T = 1/60, which calculates to a period of 0.0167 seconds. This indicates that each cycle of this 60.0 Hz electrical power takes 0.0167 seconds to complete.

This relationship is called Parasitism