a hammer taps on the end of a 4.2-mm-long metal bar at room temperature. a microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. the pulses are separated in time by 8.60 msms

The force that the other person must  apply is 75 N in opposite direction (right).

Applied force is defined as the force exerted on an object by another body or object.

The force applied by the other person is determined by applying Newton's second law of motion as follows;

F1  - F2= ma

where;

When an object moves at constant, acceleration = 0

F1 - F2 = 0

F1 = F2

F1 = 75 N, then F2 = 75 N in opposite direction.

Thus, the force that the other person must  apply is 75 N in opposite direction (right).

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Any online is a platform that allows students to access lecture notes, textbook solutions, and other study materials uploaded by other students. It does not have anything to do with predicting the decay time for a nucleus or observing patterns in nuclear decay.

However, in terms of nuclear decay, there are some patterns that can be observed. For example, the half-life of a radioactive substance is constant, regardless of the amount of material present. This means that the amount of material that remains after one half-life is always half of the original amount.

Watching what happens in the bottom-half of the display can provide information about the decay of a nucleus. The bottom-half of a decay curve represents the amount of material remaining over time. As time passes, the amount of material decreases exponentially. The half-life can be calculated from the decay curve by finding the time at which half of the material has decayed.

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Answer:

The depth of the seafloor is 1965 m if two-way travel time is 2.62 seconds

Explanation:

The formula for depth is,

Depth = 1/2 * T * 1500

If two-way travel time is 2.62 seconds, i.e. T = 2.62s,

Then the Depth is,

Depth = (1/2)(2.62)(1500)

Depth = 1965 m

Compared to the inertia of a 0.10-kilogram steel ball, the inertia of a 0.20-kilogram Styrofoam ball is: b) twice as great

Inertia is directly proportional to an object's mass. Since the Styrofoam ball has twice the mass of the steel ball (0.20 kg vs 0.10 kg), its inertia is also twice as great.

Inertia is the tendency of an object to resist changes in its state of motion. It is one of the fundamental principles of physics and is closely related to the concept of mass.

According to Newton's first law of motion, an object at rest will remain at rest, and an object in motion will continue in motion at a constant velocity, unless acted upon by an external force. This is due to the object's inertia. The greater an object's mass, the greater its inertia, and the more difficult it is to change its motion.

Inertia can be observed in everyday situations, such as when a heavy object is difficult to move or when a moving object continues to move in a straight line unless acted upon by an external force. Inertia is also important in the design of vehicles, where engineers must account for the inertia of the vehicle and its occupants in order to ensure that it can stop or change direction safely.

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Answer:

a.  Frequency is 5.45 x 10^14 hz

b.   The period = 1.8 x 10^-15 sec  {or 1.8 femptoseconds]

Explanation:

The velocity of an electromagnetic wave is given by the product of the wave's frequency(f) times its wavelength(λ).  

V = λ f     where,

V is the wave speed,

f is the wave frequency,

λ is the wavelength.

To find frequency, rearrange to:

f = V/ λ

Light travels at 3.00x10^8 m/sec.

λ is 5.50 x 10^-7 m

f = (3.00x10^8 m/sec)/(5.50 x 10^-7 m)  meters cancels, secs is on the bottom]

f = (3.00/5.50)*(10^15)  [The base 10 exponent on the bottom ius subtracted from the one on top:  98-(-7)) = 15)  

f = 0.545 x 10^15 1/s or hz

f = 5.45 x 10^14 hz

b.  The period of a wave is the inverse of it's frequesncy.  It is the time it takes for 1 wave to pass.  Invert the frequency:

 Period = 1/f

  Period =  1/(0.545 x 10^15 1/s)

Period = 1.8 x 10^-15 sec  {or 1.8 femptoseconds]

¡Hellow!

For this problem, first, lets convert the seconds in hours:

5,4x10³\(\rightarrow\) 5400

h = sec / 3600

h = 5400 s / 3600

h = 1,5

Let's recabe information:

d (Distance) = 386 km

t (Time) = 1,5 h

v (Velocity) = ?

For calculate velocity, let's applicate formula:

                                                    \(\boxed{\boxed{\textbf{d = v * t} } }\)

Reeplace according we information:

386 km = v * 1,5 h

v = 386 km / 1,5 h

v = 257,33 km/h

The velocity of the train is of 257,33 kilometers for hour.

Extra:

For convert km/h to m/s, we divide the velocity of km/h for 3,6:

m/s = km/h / 3,6

Let's reeplace:

m/s = 257,33 km/h / 3,6

m/s = 71,48

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The total resistance of the resistors in the circuit from the diagram is 20  Ω.

Resistance is a measure of the opposition to current flow in an electrical circuit.

To calculate the total resistance of the resistors in parallel, we use the formula below.

Note: Both resistors are connected in series.

Formula:

For series connection

Where:

From the diagram,

Given:

Substitute these values into equation 1

Hence, the total resistance is 20 Ω.

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Answer:

The brain analysis technique which allows for identifying which part of the brain is functional per human activity is Neuroimaging.

Explanation:

Brain Imaging (or Neuroimaging) involves the use of direct observation in a living organism of the structure, function and anatomy of its central nervous system.

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Answer:

A resistor of 160 ohms should be used to replace the current resistor

Explanation:

Applying,

Ohm's Law

V = IR................... Equation 1

Where V = Voltage of the battery, I = current, R = Resistance

From the question,

Given: I = 0.2 A, R = 120 ohms.

Substitute these values into equation 1

V = 0.2×120

V = 24 V

IF a current of 0.15 A is required,

make R the subject of equation 1

R = V/I............... Equation 2

Given: V = 24 V, I = 0.15 A

Substitute these values into equation 2

R = 24/0.15

R = 160 ohms.

Hence a resistor of 160 ohms should be used to replace the current resistor

"The property of a reflecting telescope which determines its light-gathering or light-collecting power is size of the primary lens." Correct option is B.

Refractors have a variety of advantages over reflecting telescopes. Since the reflected light does not disperse in accordance with wavelength, it is not subject to aberration. The telescope tube for a reflector is also less expensive because it is shorter than a refractor's tube of equivalent diameter.

The diameter of the objectives of an optical telescope is related to its light-gathering power, and therefore the region of the destination is proportionate to its energy strength.

The telescope will be able to gather more light and give finer information the wider the target. One aspect of an optical telescope that affects how well it can gather light is the size of the primary lens.

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The plane's speed at the end of 10.0 seconds is 200 m/s and the distance it has travelled is 1750 meters.

The initial speed of the plane, u = 150 m/s

Acceleration of the plane, a = 5 m/s²

Time, t = 10 sec

We can find the plane's speed at the end of 10. 0 seconds by the formula

a = (v - u)/ t

⇒5 = (v - 150)/ 10

⇒50 = v - 150

⇒v = 150 + 50

⇒v = 200 m/s

Now, to find the distance it has travelled we will use the kinematic equation

v² = u² + 2as

⇒200² = 150 ² + 2 × 5 × s

⇒40000 = 22500 + 10s

⇒17500 = 10 s

⇒s = 1750 m

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Answer:

radiation heat.

Explanation:

That is any heat that passes through the air, like the sun.

Answer:

radiation

Explanation: I’m sure

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The acceleration of the string is 4.3 m/s2.

We regard the positive direction for the vertical motion of mass m1 to be downward and the positive direction for the motion of mass m2 on the incline to be to the right and parallel to the incline.

There are only two ways to accelerate: changing your speed or changing your direction, or changing both. This is because velocity is both a speed and a direction.

Changing the speed at which an object is travelling is what acceleration is all about. A substance is not accelerating if its velocity is not changing. The information on the right depicts an object that is speeding as it moves northward.

Therefore, The acceleration of the string is 4.3 m/s2.

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.

The type of single-case design that involves a withdrawal of treatment and reversal of procedures is called a Reversal Design, also known as an ABAB design.

This design consists of alternating between baseline (A) and intervention (B) phases.

During the baseline phase (A), the participant's behavior is observed without any intervention.

In the intervention phase (B), a specific treatment is introduced, and the participant's behavior is monitored for any changes.

The treatment is then withdrawn (returning to A), and finally, the intervention is reintroduced (B) to observe its effects again. The Reversal Design allows researchers to establish a cause-effect relationship between the intervention and the observed changes in behavior.

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Given data

*The given initial velocity is u = 0 m/s

*The given acceleration is a = 7 m/s^2

*The given final velocity is v = 25 m/s

The formula for the time taken to reach his final velocity is given by the kinematic equation of motion as

Substitute the known values in the above expression as

Thus, the time taken to reach his final velocity is t = 3.57 s

Answer:

Drag; water.

Explanation:

Friction can be defined as a force that resists the relative motion of two objects when there surface comes in contact. Thus, it prevents two surface from easily sliding over or slipping across one another. Also, friction usually reduces the efficiency and mechanical advantage of machines but can be reduced through lubrication.

Generally, there are four (4) main types of friction and these includes;

I. Static friction.

II. Rolling friction.

III. Sliding friction.

IV. Fluid friction.

Fluid friction can be defined as a type of friction that acts on physical objects moving through a liquid or gas. A fluid refers to any physical substance that can flow and is able to take the shape of a container.

In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.

Basically, matter exists in three (3) distinct or classical phases and these are; solid, liquid and gas.

Generally, friction applies to all states of matter; in the gaseous state, it is called drag resistance and in a liquid it's called water resistance.

For a 50 kg person receives an absorbed dose of gamma radiation of 20 millirads,  the total energy absorbed is mathematically given as

E=0.1457J

Generally, the equation for the total energy absorbed  is mathematically given as

E=mass*gamma radiation

Therefore

E=50*20*19^{-3}

E=0.1457J

In conclusion,  the total energy absorbed

E=0.1457J

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Answer:

The necessary force applied by the person to hold the mass stationary there is 10 N

Explanation:

We are told that this person extends the spring 30 cm from equilibrium and holds it at this location by applying a 10 N force.

Thus, based on Hooke's law formula which is F = k Δx, we can say that the mass attached to the spring does not change the spring constant. Thus, the

same resistive spring force will still be in place and in turn, the same stretching force of 10N would still be required.

Thus;

The necessary force applied by the person to hold the mass stationary there is 10 N

Answer:

Time = 13333.33 s = 222.22 min = 3.7 h

Explanation:

The total amount of energy in two cells combined will be:

\(Total\ Energy = 40000\ J + 40000\ J\\Total\ Energy = 80000\ J\\\)

Now, we calculate the power of the batteries:

\(Power = (Voltage)(Current)\\Power = (3\ V)(2\ A)\\Power = 6\ Watt\)

Now, we use the following formula to calculate the time  the batteries will be able to deliver the power to the flashlight:

\(Total\ Energy = (Power)(Time)\\\\Time = \frac{Total\ Energy}{Power}\\\\Time = \frac{80000\ J}{6\ Watt}\)

Time = 13333.33 s = 222.22 min = 3.7 h

Answer:

1 IS CORRECT

Explanation:

Explanation:

If your AC is leaking inside the home, it's most likely due to a clogged condensate drain line. Over time, this line can become clogged with debris like dirt, dust, or mold. When your condensate drain line gets clogged, water can't escape and drain to the outside of the home.

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Answer:

b. Rollerblading.

Explanation:

Rollerblading involves balances.

Answer:

this is because mercury is more dense than iron nail, while water is less dense than the nail.

Explanation:

Answer:

Density

Explanation:

This is because of difference in densities of iron nail, mercury and water. Iron nail is less dense than mercury so it floats on mercury while it is more dense than water so it sinks!

Answer:The object will begin to move

Explanation:

Answer:

impulse = 0.0783 kg.m/s

Explanation:

The impulse is the product of the force and an interval of time. This can be represented in terms of the mass of the body and the change in the velocity of the body in such a time:

\(F\Delta t=m\Delta v\) \(=|m(v_f-v_i)|\)

m: mass of the body = 2.7gm = 0.0027 kg

vf: final velocity = -14m/s

vi: initial velocity = 15m/s

vf is negative because the direction of the ball is opposite to the initial direction:

\(|m(v_f-v_i)|=|(0.0027kg)(-14m/s-15m/s)|=0.0783\frac{kg.m}{s}\)

hence, the impulse of the ping pong ball is 0.0783 kg.m/s

The false statement regarding waves approaching a coast is (b) Waves speed up when approaching the beach.

In reality, waves typically slow down when approaching the beach. This is due to the effect of the shallow water near the shore, which causes the bottom of the wave to interact with the seabed, resulting in a decrease in wave speed.

As the wave slows down, its wavelength decreases, causing the wave crests to bunch closer together (statement c). Additionally, the approaching wave crests align parallel with the coastline in what is known as wave refraction (statement d).

However, the increase in wave height as the waves approach the beach (statement a) is not always consistent and can vary depending on factors such as the shape of the coastline and the underwater topography.

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Answer:

0.479 m

Explanation:

v = fl

340 = 710l

l = 0.479 m