when does the pulser create electrical signals that excite the transducer's pzt crystals and create sound beams?

Answer:

Stars create new elements in their cores bu squeezing elements together in a process called unclear fusion. First stars fuse hydrogen atoms into heluim. Helium atorm then fuse to create berylluim and so on until fusion in the star’s core has created every element up to icon.

Answer:

A

Explanation:

Trial and error is basically trying something, if it works, great. If it does not work, try another way.

Answer:

A. Trial and error

Explanation:

The other user is correct.

98.9°F is equivalent to 37.17°C temperature. Using Formula: °C = (°F - 32) x 5/9

To convert 98.9°F to Celsius (°C), you can use the following formula:

°C = (°F - 32) x 5/9

Substituting 98.9 for °F in the formula, we get:

°C = (98.9 - 32) x 5/9 = 37.17

Therefore, 98.9°F is equivalent to 37.17°C.

It's important to note that when converting Fahrenheit to Celsius, the resulting Celsius temperature is often more precise with decimal places. In this case, the Celsius temperature is 37.17°C, which means that the temperature is between 37°C and 38°C.

To double-check your conversion, you can also use online temperature conversion tools or smartphone apps that are readily available and accurate.

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Answer:

Perpendicular ; Parallel

The answer is A) 250 mA, which is the closest option.

To solve this problem, we can use the formula for the current in an RL circuit:

I(t) = (V/R) * (1 - e^(-Rt/L))

where I(t) is the current at time t, V is the voltage of the power supply, R is the resistance of the circuit, and L is the inductance of the inductor.

Since the switch is initially open, there is no current in the circuit, and we can assume that the voltage across the inductor is 15 V. Thus, we can rewrite the formula as:

I(t) = (15/60) * (1 - e^(-60t/45))

Now we can plug in t = 7.0 ms = 0.007 s and solve for I(0.007):

I(0.007) = (15/60) * (1 - e^(-60(0.007)/45))

= 0.275 A or 275 mA (rounded to the nearest mA)

Therefore, the answer is A) 250 mA, which is the closest option.

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Yes, Ballistic stretching can be harmful if it is not performed properly.

This type of stretching involves bouncing movements, which can place excessive strain on the muscles and connective tissues. This can lead to muscle strains or tears, as well as other injuries. It is important to use caution when performing ballistic stretches and to stop if any pain or discomfort is experienced. It is also recommended to warm up before stretching and to stretch slowly and smoothly, rather than using ballistic movements.

Ballistic stretching can also increase the risk of muscle imbalances and poor posture if it is not balanced with other types of stretching, such as static stretching. It is generally more effective and safer to gradually increase flexibility through regular, consistent stretching rather than trying to force the body to stretch too quickly or aggressively.

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Answer:

I'm not sure

Explanation:

I have had that question to Uchida c r go crew in to go be

Answer:

d 200 I'm 50 50 on it though

The force that propels a cannonball when fired from a cannon is the result of the explosive combustion of gunpowder.

When a cannon is fired, the gunpowder inside the cannon chamber undergoes a rapid chemical reaction known as combustion. Gunpowder typically consists of a mixture of sulfur (S), charcoal (C), and potassium nitrate (KNO₃). During combustion, the potassium nitrate acts as an oxidizing agent, releasing oxygen (O₂).
The carbon in the charcoal combines with this oxygen, resulting in the formation of carbon dioxide (CO₂) gas. The combustion process produces a large volume of hot, expanding gases that create a high-pressure environment inside the cannon chamber.

The pressure exerted by these gases propels the cannonball out of the cannon barrel, providing the force necessary for its movement.

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The work done by the air is 88.06kJ, the change in the air’s internal energy is 357.8J and the type of ideal thermodynamic process is isobaric process.

Given the constant pressure of cylinder (P) = 8.6 x 10^5Pa.

The increase in the cylinder’s volume is (V) = 4.0^5 x 10^-4 m^3.

The energy transferred out of the cylinder as heat (Q) = 9.5J

(a) We know that work done (W) = -PexternalΔV

W = -8.6 x 10^5 x 4.0^5 x 10^-4 = -88.06kJ

Hence the work done is 88.06kJ.

(b) From first law of thermodynamics we know that change in internal energy is equal to heat released - work done.

ΔU = Q - W where W is work and U is internal energy.

ΔU = -9.5 - 348.3 = -357.8J

(c) The type of ideal thermodynamic process this approximates is isobaric process. Under constant pressure, the isobaric process is a thermodynamic process. Even though the pressure is constant in this operation, the temperature, volume, and internal energy are not.

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A satellite travels at a constant speed, its shape is a circle.

An integrated receiver and transmitter of radio signals known as a transponder, a satellite is essentially a self-contained communications system that can receive signals from Earth and retransmit those signals back to Earth.

The three primary parts of a satellite are the propulsion system, which includes the rockets that move the satellite, the power system, which includes the solar panels that supply power, and the communications system, which includes the antennae and transponders that receive and retransmit signals. To enter into the proper orbit and periodically adjust its position, a satellite needs a propulsion system of its own.

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Answer:

a

Explanation:

The correct answer is a) equal to the angle of rotation.

When a mirror is rotated through a certain angle, the reflected beam also rotates through the same angle. This is because the angle of incidence (the angle between the incident beam and the normal to the mirror) is equal to the angle of reflection (the angle between the reflected beam and the normal to the mirror), and both of these angles are measured with respect to the same plane.

Therefore, if the mirror is rotated through an angle of θ, the incident beam will also rotate through θ to maintain the same angle of incidence, and the reflected beam will rotate through θ to maintain the same angle of reflection. The result is that the reflected beam is rotated through an angle that is equal to the angle of rotation of the mirror.

Answer:

A medical proffesional

Explanation:

They deal with injurys and hurt people.

Answer:

To solve this problem, you can use the principle of transverse static equilibrium. This states that the sum of the forces acting on an object must be equal to zero for the object to be in equilibrium. In this case, the forces acting on the rod are the tension in the strings, the weight of the rod, and the weight of the masses hung on the rod.

First, you can find the weight of the rod by multiplying its mass by the acceleration due to gravity:

Wrod = mrod * g

= 0.7 kg * 9.8 m/s^2

= 6.86 N

Next, you can find the weight of the 4.0-kg mass by multiplying its mass by the acceleration due to gravity:

W1 = m1 * g

= 4.0 kg * 9.8 m/s^2

= 39.2 N

You can find the weight of the 2.0-kg mass in the same way:

W2 = m2 * g

= 2.0 kg * 9.8 m/s^2

= 19.6 N

To find the tension in the strings, you can use the principle of transverse static equilibrium. The forces acting on the rod are the tension in the strings, the weight of the rod, and the weight of the masses hung on the rod. You can represent these forces as vectors acting at the points where the strings are attached to the rod. The vectors representing the tension in the strings will be equal in magnitude but opposite in direction. The vectors representing the weight of the rod and the masses will act vertically downward.

[asy]

unitsize(2cm);

pair P1, P2, P3, P4;

P1 = (0,0);

P2 = (1,0);

P3 = (0.8,0);

P4 = (0.2,0);

draw((-1,0)--(2,0));

draw((0,-1)--(0,1));

draw(P1--P3,red,Arrow(6));

draw(P2--P4,red,Arrow(6));

draw(P3--P4,red,Arrow(6));

draw((P1)--(P1+(0,-0.7)));

draw((P2)--(P2+(0,-4)));

draw((P2)--(P2+(0,-2)));

label("$T_1$", (P1 + P3)/2, red);

label("$T_2$", (P2 + P4)/2, red);

label("$W_{rod}$", (P3 + P4)/2, red);

label("$W_1$", (P2 + P4 + (0,-4))/2, red);

label("$W_2$", (P2 + P4 + (0,-2))/2, red);

label("$12$ cm", (0,0.2), red);

label("$20$ cm", (0.4,-0.4), red);

label("$25$ cm", (0.75,-0.4), red);

[/asy]

The sum of the forces in the x-direction must be equal to zero, so you can set up the following equation:

T1 - T2 = 0

The sum of the forces in the y-direction must also be equal to zero, so you can

Stopping distance of the car, as measured from the point where the driver first sees the red light, is 43.95 meters We can use distance-time formula.

To calculate the stopping distance of the car, we need to determine the distance traveled during the driver's reaction time and the distance traveled while the car is decelerating.

During the driver's reaction time, the car will continue to move forward at its initial speed of 15.5 m/s. The distance traveled during this time is:

\(d_reaction = v_initial * t_reaction = 15.5 m/s * 0.321 s = 4.98 m\)

After the driver reacts, the car begins to decelerate at a rate of \(6.2 m/s^2\). Use equation:

d =\(v_initial * t + (1/2) * a * t^2\)

where d: distance traveled, v_initial: initial velocity, t: time, a: acceleration, and final velocity = 0 (since car stops).

We need to find the distance traveled during the deceleration period, so we can rearrange the equation to solve for d:

d = \((v_initial^2) / (2a)\)

Put values:

\(d_deceleration = (15.5 m/s)^2 / (2 * -6.2 m/s^2) = 38.97 m\)

Note that we used a negative value for acceleration, since the car is decelerating (slowing down) rather than accelerating (speeding up).

The total stopping distance is the sum of the distance traveled during the driver's reaction time and the distance traveled while decelerating:

\(d_total = d_reaction + d_deceleration = 4.98 m + 38.97 m = 43.95 m\)

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They have a limited supply in nature, therefore if they are used excessively, they will become exhausted.

Today, we recognise that using fossil fuels has a negative impact on the environment. Fossil fuels produce and utilise local pollutants, and their continued use permanently alters the temperature of our entire world.

Wastes from combustion sources are those that result from carbon pollution (i.e., coal, oil, natural gas). Included in this are all ash and particles taken out of the flue gas.

The fossile fuel is limited in nature. So, it should not waste energy from fossil fuels.

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Answer:

90N

Explanation:

Assuming there are no other forces there would be an equal and opposite reaction of -90N. Assuming the question wants the magnitude of the force and not the vector it would be 90N

If a person has weight of 90 N, the force of the floor reacting on this 90 N.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

In weight on the floor is 90 N then opposite reaction force acting on the person is also 90 N by Newton's third law.

If a person has weight of 90 N, the force of the floor reacting on this 90 N.

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|E| = 16.67 N/C and the direction of this Electric field is in the downward direction.

We have a Charge particle present inside a Electric field.

We have to determine the magnitude (in n/c) and direction of an electric field that exerts a 2 x \(10^{-5}\) Newton.

The electric field intensity at a point R meters away from a charge Q is the amount of force experienced by the test charge (\($q_{o}\)) of unit magnitude at a distance R meters away the Charge Q. Mathematically -

E = \($\frac{F}{q}\)

According to the question, we have -

F = 2 x \(10^{-5}\) Newton

|Q| = - 1.2 \(\mu\)C = - 1.2 x \(10^{-6}\)  \(\mu\)C = 1.2 x \(10^{-6}\) \(\mu\)C

Therefore -

E = \($\frac{2\times 10^{-5} }{1.2\times 10^{-6} }= \frac{100}{6} = 16.67\;N/C\)

Therefore -

|E| = 16.67 N/C and the direction of this Electric field is in the downward direction.

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Answer:

El trabajo realizado por la niña es 25.9 J.

Explanation:

El trabajo ue hace la niña viene dado por:

\( W = |F|*|d|*cos(\theta) \)    

En donde:

F: es la fuerza realizada = 10 N

d: es el desplazamiento = 300 cm

θ: es el ángulo entre la fuerza y el desplazamiento = 30°

Entonces, el trabajo es:

\( W = |F|*|d|*cos(\theta) = 10 N*3 m*cos(30) = 25.9 J \)    

Por lo tanto, el trabajo realizado por la niña es 25.9 J.

Espero que te sea de utilidad!        

The type of precipitation described in this scenario is called sleet. It occurs when snowflakes melt into raindrops in a layer of warm air, and then refreeze into ice pellets before reaching the ground in a layer of cold air closer to the surface.

Sleet is often associated with winter storms and can make roads and sidewalks slippery and hazardous.Sleet is the term for the process you are describing. Sleet is a type of precipitation that develops when snowflakes travel through a warm air layer and partially melt before falling through a cold air layer closer to the ground and refreezing as ice pellets. This typically occurs when there is a warm air layer above and a cold air layer close to the surface. When snowflakes fall through warm air, they start to melt, but if the temperature is below freezing close to the ground, they will refreeze into ice pellets before they reach the surface. Sleet differs from freezing rain, which happens when droplets come into contact with a cold surface, like the ground, and then freeze.

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The kangaroo's horizontal speed will be 9.7 m/s and its departure speed will indeed be 10.65 m/s.

By observing the pace at which this compressed region moves through the medium, we may determine the sound speed. The sound wave travels at a speed of around 343 meters per second in low humidity at 20 degrees Celsius.

The following equation relates the distance to the direction and initial velocity:

d = [v₀²sin2θ]/g, where θ – the angle of the jump.

Thus, v₀² = gd / (sin2θ) = (9.8×8)/0.69 = 113.62

v₀ = 10.65 m/s ( the take off speed).

The horizontal velocity equals:

vₓ = v₀cos 22° = 10.65 m/s × 0.92 = 9.7 m/s

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Answer:

Y

Explanation:

The fulcrum is the point where the scissor blades are joined together. The force or effort is the end or handle of the scissors. The parts of a pair of pliers are similar to the scissors.

1/second Equals 1.99 x 10-7 radians. Earth rotates at a rate of 1.99 x 10-7 per second.

If the angles were not approximately 1 one of, then the radius times the angle's measurement in radians, or the width of a arc s = r, would be the ratio of the distance by the point located on the circle. The result of substituting into the linear speed formula is v = r t or v = r t.

A pseudovector used in physics to express how quickly the angular location or orientation of an item changes over time is called an angular velocity or rotational velocity.

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Using newtons second law .

\(\\ \sf\longmapsto Force=ma\)

\(\\ \sf\longmapsto Force=4500(2)\)

\(\\ \sf\longmapsto Force=9000N\)

Yes the motion is accelerated.

We have a artificial satellite that moves at a steady 25,000 km/hr in a circular orbit around earth.

We have to determine whether or not it is accelerated.

An artificial Satellite is a man - made artificial body placed in orbit round the earth or moon or another planet in order to collect information or for communication.

According to the question -

v = 25000 km/hr

Now for the motion to be accelerated the velocity must change with respect to time. But, the velocity here is constant. It should be kept in mind that the velocity is a vector quantity, its magnitude is constant but its direction keeps on changing in circular motion, and hence, its acceleration also changes.

Hence, yes the motion is accelerated.

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Explanation:

the object should be placed at 2F

Answer:

at 2F

Explanation:

hope it will help you

The proper time interval between the two events is 0.435 s. Hence, the correct option is (b) 0.435 s.

Given that an observer flying over the stadium at a speed of 0.75c, measures 0.658 s as the time between the two events (hitting and catching the ball).

To find the proper time interval between the two events.

The time interval measured by the observer is called the "dilated" time interval (t').

The proper time interval (Δt) is found using the formula,

Δt = t' / γ

where

γ = 1 / √[1 - (v/c)²] is the Lorentz factor, v is the velocity of the observer, and c is the speed of light.

Given:

v = 0.75c, t' = 0.658 s, and

c = speed of light = 3 × 10⁸ m/s

Thus,

γ = 1 / √[1 - (v/c)²]

= 1 / √[1 - (0.75)²]

= 1 / √(0.4375)

= 1 / 0.6614

= 1.5126

Therefore, Δt = t' / γ

= 0.658 / 1.5126

≈ 0.435 s

Therefore, the proper time interval between the two events is 0.435 s. Hence, the correct option is (b) 0.435 s.

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Temperature is a measure of the average energy of particles in a substance is true.

Temperature is indeed a measure of the average energy of particles in a substance. Temperature reflects the kinetic energy of the particles, which is related to their random motion. In a substance, the particles are in constant motion, and their individual energies contribute to the overall temperature of the substance. A higher temperature indicates that, on average, the particles possess greater energy and are moving more vigorously. Conversely, a lower temperature signifies lower average energy and slower particle motion. Temperature is typically measured using various scales, such as Celsius, Fahrenheit, or Kelvin, and it serves as a fundamental parameter in thermodynamics and many other scientific disciplines.

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No, a magnetic compass will not work properly near an automobile or train and is therefore denoted as option A.

This is referred to as an instrument which is used for determining the direction on the surface of Earth by means of a magnetic pointer that aligns itself with Earth’s magnetic field.

A magnetic compass will not work properly near an automobile or train because the magnetic lines of force are unaffected by paper, glass, or plastic and we are ware that this vehicles have parts such as the windows, engine etc which are made from these type of materials. They will however work properly if these parts are avoided by the user of the compass.

This is therefore the reason why No was chosen as the correct choice in this type of scenario.

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