2. A fish swimming at a constant speed of 18 m/s spots a sta-
tionary barracuda. Just as the fish passes the barracuda, the
predator begins swimming with a constant acceleration of
magnitude 2.2 m/s². The fish and barracuda are moving in the
same direction.
(a) How far does the barracuda swim before catching the fish?
(b) At what time will this occur? (Hint: Graphing may help you
visualize this problem.)
пип

Answer:

\(Velocity=\frac{dx}{dt}\)

Explanation:

Remember that instantaneous velocity is just a measure to know the velocity that any object has at any point given in time, so we just need to know the distance it has travel, which would be the change in position, and the time it took that change in position to occurr, this means distance by time, so we just divide dx by dt and we have the solution for instantaneous velocity.

If a change in position as denoted by \(dx\) and \(dt\) change in time, the instantaneous velocity will be given by,

\(v = \dfrac {dx}{dt}\)

\(v = \dfrac {dx}{dt}\)

Where,

\(v\) - instantaneous velocity

\(dt\)   - change in distance (position)

\(dt\)- change in time

Therefore, if a change in position as denoted by \(dx\) and \(dt\)change in time, the instantaneous velocity will be given by,

\(v = \dfrac {dx}{dt}\)

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A mass m at the end of a spring oscillates with a frequency of 0.71 Hz . When an additional 780 g mass is added to m, the frequency is 0.64 Hz, thus the value of mass is 3.376 kg

In terms of physics, frequency refers to the quantity of waves that pass through a given point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences over the course of a single unit of time.

Given that,

Frequency = 0.71 Hz

Mass = 780 g

After added to m, frequency becomes = 0.64 Hz.

Let the spring constant is k

k=m × w²

from the given info.

m × (0.71)² = (m+0.78) × (0.64)²

m ×[(0.71)²- (0.64)²] = 0.78 × (0.64)²

m = 0.78 × (0.64)² /[(0.71)²- (0.64)²]  

m = 0.319 / 0.0945

m = 3.376 kg

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Answer: x = 128°

180° - 52° = 128°

Answer:

128 degrees

Explanation:

A circle has a degree of 360, all around. You can imagine a circle, with the center being where the line intercepts the right angle.

360 = 52 + 38 + 142 + x

360 = 232 + x

128 = x

The question above wants to assess your ability to simplify complex matters. In that case, I can't answer this question for you, but I'll show you how to answer it.

First, you should research electricity and magnetism. This research will make you understand the subject and all its elements. You can do this research in textbooks and digital platforms aimed at children and teenagers since these media usually present subjects in a more simplified way.

After doing this research, you will be able to write a text about electricity and magnetism as follows:

Remember that you must use simple language, without the use of technical terms, but with common terms.

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The magnitude of normal force (N) on motorcycle is 704.537 N

In this type of scenario, we have been told that the mass, denoted by "m," is 350 kilograms, that the speed of the motorcycle, denoted by "v," is 29 meters per second, and that the radius of curvature, denoted by "R," is 105 meters. We can utilize the second law of motion that Newton proposed to compute the magnitude of the normal force, which is as follows:

\(m . g - N = \frac{mv^{2} }{R}\)

By applying the formula above we have:

\(350 x 9.8 - N= \frac{350x29^{2} }{108}\)

3430 - N = 2725.46296

N = 3430 - 2725.46296

N = 704.537 N

Thus, the magnitude of normal force on motorcycle would be 704.537 N

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Answer:it’s A. right for ape x

Explanation:

Based on data, digital waves are more reliable because they are less likely to change when copied (Option A).

A wave is a periodic distortion capable of traveling through a suitable media (either air or water).

In conclusion, based on data, digital waves are more reliable because they are less likely to change when copied (Option A).

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Answer:  The speedometer does not give the direction of the vehicle. Thus, this device can measure only the speed of a vehicle, not its velocity.

Explanation: A speedometer is a device that helps to estimate and visualize a vehicle's instantaneous speed, which has only magnitude.

Answer:

a. 4 g/mL

Explanation:

First, we need to find the volume of the object. The volume is equal to the volume of the water displaced. So, it can be calculated as the difference in the volumes

75 mL - 50 mL = 25 mL

Then, the volume of the object is 25 mL and the mass is 100 g. Now, we can calculate the density as follows

density = mass/volume

density = 100 g/25 mL

density = 4 g/mL

Therefore, the answer is

a. 4 g/mL

Answer:

E = k q1 q2 / r^2      electric potential

E / q1 = k q2 / r^2 = 9 * 10E9 * 25 * E-9 / ,37^2 = 1644 V

(Gauss Law - charge of sphere equivalent to charge at center)

Answer:

atoms that have the same # of protons but a DIFFERENT # of NEUTRONS

Explanation:

Answer:

D-They have different number of neutrons

Explanation:

brainliest? Plz

Since no work is done, the power exerted is zero. Therefore, the man exerts no power on the wall.

In physics, force is defined as any action that can change the motion of an object or cause an object to accelerate. Force is a vector quantity, meaning that it has both magnitude (size or strength) and direction. The unit of force in the International System of Units (SI) is the Newton (N), which is defined as the amount of force required to accelerate a mass of one kilogram at a rate of one meter per second squared (1 N = 1 kg × 1 m/s^2). Force can be measured using a variety of instruments, such as spring scales, strain gauges, or force plates. Some common types of forces include gravitational force, electromagnetic force, frictional force, and normal force. The study of forces and their effects on the motion of objects is known as mechanics and is a fundamental concept in physics.

Here,

a. The man does not do any work on the wall because the wall does not move. Work is only done when there is a displacement in the direction of the force applied.

b. Since no work is done, no energy is used or transferred.

c. The power exerted by the man can be calculated using the formula:

Power = Work / Time

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The amount the needle on the meter is deflected A. increases

This phenomenon can be explained by Faraday's law of electromagnetic induction. According to this law, when a magnetic field (created by the bar magnet) passes through a coil of wire, it induces an electric current in the wire. This induced current generates its own magnetic field, which interacts with the magnetic field of the bar magnet.

The deflection of the meter needle is a result of this induced current. When the number of coils of wire is increased, there is a greater number of wire loops for the magnetic field to pass through. This leads to a stronger induction of electric current, resulting in a larger deflection of the meter needle.

By increasing the number of coils, more magnetic flux is linked with the wire, resulting in a higher induced electromotive force (emf) and a greater current. This increased current produces a stronger magnetic field around the wire, leading to a larger deflection on the meter. Therefore, increasing the number of coils of wire enhances the magnetic field interaction, resulting in an increased deflection of the meter needle. Therefore, Option A is correct.

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Answer:

the period of the physical pendulum is 0.498 s

Explanation:

Given the data in the question;

\(T_{simple\) = 0.61 s

we know that, the relationship between T and angular frequency is;

T = 2π/ω ---------- let this be equation 1

Also, the angular frequency of physical pendulum is;

ω = √(mgL / \(I\) ) ------ let this equation 2

where m is mass of pendulum, L is distance between axis of rotation and the center of gravity of rod and \(I\)  is moment of inertia of rod.

Now, moment of inertia of thin uniform rod D is;

\(I\) = \(\frac{1}{3}\)mD²

since we were not given the length of the rod but rather the period of the simple pendulum, lets combine this three equations.

we substitute equation 2 into equation 1

we have;

T = 2π/ω OR T = 2π/√(mgL/\(I\)) OR T = 2π√(\(I\)/mgL)

so we can use \(I\) = \(\frac{1}{3}\)mD² for moment of inertia of the rod

Since center of gravity of the uniform rod lies at the center of rod

so that L =  \(\frac{1}{2}\)D.

now, substituting these equations, the period becomes;

T = 2π/√(\(I\)/mgL) OR T = \(2\pi \sqrt{\frac{\frac{1}{3}mD^2 }{mg(\frac{1}{2})D } }\) OR T = 2π√(2D/3g )  ----- equation 3

length of rod D is still unknown, so from equation 1 and 2 ( period of pendulum ),

we have;

ω\(_{simple\) = 2π/\(T_{simple\) OR  ω\(_{simple\) = √(g/D) OR  ω\(_{simple\) = 2π√( D/g )  

so we simple solve for D/g and insert into equation 3

so we have;

T = √(2/3) × \(T_{simple\)

we substitute in value of \(T_{simple\)

T = √(2/3) × 0.61 s

T = 0.498 s

Therefore, the period of the physical pendulum is 0.498 s

The balanced reaction that could lead to the image shown is; 2/1 H + 1/1H -----> 3/2He.

A  nuclear equation is one which involves changes in the nucleus of atoms to yeild new isotopes of elements.

We know that a nuclear equation must be balanced. The balanced reaction that could lead to the image shown is; 2/1 H + 1/1H -----> 3/2He.

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Answer:

\(\text{(a)}\\\text{Given that current energy at starting point }h_{1} \text{ is}:\\E_{h1}=mgh+\frac{1}{2}kx^2\\\text{Plug in height and mass: }E_{h1}=10g+250(0.8)^2=10g+160=258J\\\text{Using Conservation of Energy: }E_{h1}=E_{h2} \\\therefore 258J=mg(h_{2}-h_{1})+\frac{1}{2}mv^2\\=258J=10g+v^2\\=160=v^2\\\therefore v=40m/s \text{ at }h_{2}\\\)\(\text{(b)}\\\text{Again, apply conservation of energy: } 258J=mg(h_{3}-h_{2})+\frac{1}{2}mv^2\\\text{Plugging in: }258J=16g+v^2 \\\text{ Simplify: }101.2=v^2\\\therefore v=10.05m/s \text{ at } h_{3}\)

Answer:

Explanation:

When spheres or objects come into contact and then move apart, it is typically due to the presence of an external force or energy imparted to the system. There are a few possible reasons for spheres to move apart after contact:

Elasticity: If the spheres are made of elastic materials, such as rubber or certain metals, they can deform upon contact and then regain their original shape when the external force is removed. This elasticity causes the spheres to move apart.

Repulsive forces: If the spheres have like charges or magnetic properties, they can experience repulsive forces when brought close together. These repulsive forces push the spheres apart once the external force is no longer present.

Conservation of momentum: If the spheres are initially at rest and then pushed together with an external force, the conservation of momentum requires them to move apart after the force is removed. This is due to Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.

Overall, the specific reason for spheres moving apart after contact depends on the properties of the spheres and the nature of the external force or energy involved.

Jack speed as he hits the water is 14.13m/s

What is speed?
The speed of an object, also known as v in kinematics, is the size of the change in that object's position over time or the size of the change in that object's position per unit of time, making it a scalar quantity. The instantaneous speed is the upper limit of the average speed as the duration of the time interval approaches zero. The average speed of an item in a period of time is equal to the distance travelled by the object divided by the duration of the period. Velocity and speed are not the same thing.

The only force on Jack is gravity, which points straight down, and has an acceleration of 9.91m/s².  Whether he's falling off a bridge or simply standing still on the surface of the earth, the acceleration due to gravity is the same.

If you're looking for the speed of Jack as he hits the water, you just need to solve for v in the equation\($v^2 = v_0^2 + 2ad$\).  
Here,
v is Jack's speed as he hits the water,
\($v_0$\) is Jack's initial speed (which is zero since he's not moving when he jumps),
a is Jack's acceleration (which is 9.91m/s²), and
d is Jack's displacement (which is the height of the bridge, which you said is 10m).  
This gives you an answer of \($v = \sqrt{2ad} = \sqrt{2(9.91)(10)} = 14.13 \ \mathrm{m/s}$\)

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Answer:

a - 3, 5

b - 1

c - 2, 4

Explanation:

a). The distance between fringes on the screen

        \($y = \frac{m \lambda L}{d}$\)

where, λ is wavelength, m is order of pattern, L is distance between slit and screen, d is separation between slits.

Now we analyze that spacing between bright spots increases as increasing distance L from slits to wall and increasing the wavelength of the laser light, λ.

b). The spacing between the bright spots decreases as the distance between the two slits increases.

c). Has no effect on the spacing between the bright spots on the wall by increasing the distance from the laser to the slits as well as increasing the brightness of the laser.

Answer:

just use the formula λ = v/f

Explanation:

v = velocity

f = frequency

6.6 J/K

1.4 J/K

190 J/K

100 J/K

6.2 J/k

i think this is a answer

The potential energy of the roller coaster is 176,400 J (joules).

The potential energy of an object is given by the formula PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical position of the object.

In this case, the roller coaster is at a peak of 20m and has a mass of 900kg. The acceleration due to gravity, g, is approximately 9.8 \(m/s^2\).

Using the formula, we can calculate the potential energy:

PE = mgh

= (900 kg)(9.8 \(m/s^2\))(20 m)

= 176,400 J

Therefore, the potential energy of the roller coaster is 176,400 J (joules).

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Answer:

v = 0.16 m/s in the positive x direction.

Explanation:

       \(p_{o} =m_{1} * v_{o1} + m_{2} * v_{o2} (1)\)

       \(p_{o} =110 kg * 4.4 m/s + 135 kg * (-3.3 m/s) (2)\)

       \(p_{f} =( m_{1} + m_{2} )* v_{f} (3)\)

       \(p_{f} =( m_{1} + m_{2} )* v_{f} = (110 kg + 135 kg)* vf (4)\)

       \(v_{f} = \frac {110 kg * 4.4 m/s + 135 kg * (-3.3 m/s) }{(110 kg + 135 kg)} = 0.16 m/s (5)\)

The plate that feels colder is likely a better conductor of heat compared to the other plate.

Compared to the other plate, the one that feels cooler is probably a greater heat conductor. The capacity of a material to transfer heat is known as conductivity. A colder feeling will result from the plate's ability to more efficiently absorb heat from our skin if its thermal conductivity is higher.

The two plates may truly be at the same temperature, but our perception of that temperature is affected by the rate of heat transmission, it is crucial to note.

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Vehicles need to be serviced for several reasons such as preventing costly repairs and improving fuel economy.

First, regular maintenance can help to prevent costly repairs down the road. Second, maintenance can help to improve fuel economy and emissions. Third, maintenance can help to keep your vehicle safe and reliable.

The servicing requirements for petrol/diesel and electric vehicles differ in a number of ways. Petrol/diesel vehicles require oil changes more frequently than electric vehicles. This is because petrol/diesel engines use oil to lubricate the moving parts, while electric motors do not. Petrol/diesel vehicles also require tune-ups more frequently than electric vehicles.

This is because petrol/diesel engines have more moving parts that need to be synchronized, while electric motors have fewer moving parts.

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Answer:Correct option is B)

In horizontal direction, two forces are acting on the block : 100 N force and friction force (f)

f=μN=μmg=0.5×10×10=50N

So, net force acting on the block in horizontal direction = 100 N-50 N = 50 N

acceleration of the block = Net force / mass of block = 50 N/10 kg = 5 ms

−2

Solve any question of Laws of Motion with:-

Explanation:

Answer:

a

Explanation:

Answer:

To convert nanometers (nm) to picometers (pm), you need to multiply the value by 1,000. Therefore, to convert 12 nanometers to picometers, you would perform the following calculation:

12 nm * 1,000 pm/nm = 12,000 pm

So, 12 nanometers is equal to 12,000 picometers.

The nature of science is an extensive and multifaceted concept that refers to various qualities, including its subject matter, methodology, principles, and theories.

It is a process of systematic inquiry that aims to explain the natural world through empirical observation, testing, and interpretation.

Science is characterized by its openness to criticism, objectivity, and the search for evidence to support or refute hypotheses and theories.

Science is dynamic and continuously evolving, with new discoveries, theories, and innovations that challenge our understanding of the world around us.

The nature of science encompasses several key concepts, including the use of empirical evidence, peer review, and the scientific method.

Empirical evidence refers to observable, measurable, and testable phenomena that can be subjected to scientific inquiry.

Peer review is the process by which scientific findings are evaluated by other experts in the field, ensuring their accuracy and validity.

The scientific method is a structured approach to inquiry that involves formulating hypotheses, testing them through experimentation or observation, and drawing conclusions based on the data collected.

Scientific knowledge is tentative and provisional, meaning that it is subject to change in the light of new evidence or findings.

As a result, science is a self-correcting process that relies on continued experimentation, observation, and testing to refine and expand our understanding of the natural world.

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