which of these changes does a submarine encounter as it returns from the bottom of the ocean to the surface of the ocean

Answer:

78.4 J

Explanation:

Given:

Mass of the object (m) = 2.0 kg

Height or displacement of the mass (h) = 4.0 m

Now, change in gravitational potential energy (ΔU) = ?

Change in gravitational potential energy of an object is the energy stored by the object when it is raised to some height above the reference ground level.

Change in gravitational potential energy of an object of mass 'm' raised to a height 'h' above the ground is given as:

[tex]\Delta U=mgh[/tex]

Where, 'g' is the acceleration due to gravity and has a value of 9.8 m/s².

Now, plug in all the given values and solve for ΔU. This gives,

[tex]\Delta U=(2.0\ kg)(9.8\ m/s^2)(4.0\ m)\\\\\Delta U=78.4\ J[/tex]

Therefore, the change in gravitational potential energy is 78.4 J.

The change in gravitational energy when a 2.0 kg mass is lifted 4.0 m above the ground is [tex]\(78.4 \, \text{J}\)[/tex].

The change in gravitational potential energy [tex](\(\Delta U\))[/tex] when a mass \(m\) is lifted to a height [tex]\(h\)[/tex] is given by the formula:

[tex]\[\Delta U = m \times g \times h\][/tex]

where:

[tex]\(m\)[/tex] is the mass of the object (in kilograms),

[tex]\(g\)[/tex] is the acceleration due to gravity (approximately [tex]\(9.8 \, \text{m/s}^2\)[/tex] on Earth),

[tex]\(h\)[/tex] is the height above the ground (in meters).

Given:

[tex]\(m = 2.0 \, \text{kg}\)[/tex]

[tex]\(h = 4.0 \, \text{m}\)[/tex]

[tex]\(g \approx 9.8 \, \text{m/s}^2\)[/tex]

Plugging in the values:

[tex]\[\Delta U = 2.0 \, \text{kg} \times 9.8 \, \text{m/s}^2 \times 4.0 \, \text{m}\][/tex]

[tex]\[\Delta U = 78.4 \, \text{kg} \cdot \text{m}^2/\text{s}^2\][/tex]

Since [tex]\(1 \, \text{kg} \cdot \text{m}^2/\text{s}^2\)[/tex] is equivalent to [tex]\(1 \, \text{Joule}\) (J)[/tex], the change in gravitational potential energy is:

[tex]\[\Delta U = 78.4 \, \text{J}\][/tex]

Explanation:

V=IR; I=V/R

V=120V, R=10

I= 120/10=12

The current in the circuit is 12A

The current in a 120V circuit with a resistance of 10 ohms is 12 amperes, as calculated using Ohm's Law.

To calculate the current in a 120V circuit with a resistance of 10 ohms, you can use Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). Thus,

I = V / R

I = 120V / 10Ω

I = 12A

The current in the circuit is therefore 12 amperes (A).

Answer:

the electron.

Explanation:

the atom has 3 types of particles: protons, neutrons, and electrons. protons have a positive charge, neutrons have a neutral charge, and they are both located in the nucleus. the electron is negatively charged, and it's located in the electron cloud, outside the nucleus.

Answer:

D. Tishaura predicts that all-cotton socks will absorb the most sweat,  because she thinks cotton is very absorbent.​

Explanation:

The steps for scientific inquiry should be:

1. Observation

In this phase, you observe things that pique your interest and formulate a scientific question. This should be option A where Tishaura wonders which sock most absorbent.

2. Hypothesis.

The second step is making a hypothesis, educated guess about what the research result will be. This should be the option D, Tishaura expects that cotton sock absorbs more than others.

3. Experiment  

In the third step, you test the hypothesis by designing and doing an experiment. It will be option C.

4. Analysis of experimental results

Gathering the result and doing analysis to find out if the hypothesis true. Tishaura found that all-cotton sock weight more. This process will be option B  

5. Make a conclusion;

Determine whether you accept the hypothesis or not. There is no option that describes this process.

Step two of the inquiry process should be option D

The net force on the rocket is  846400 N.

Answer:

Explanation:

It is known that weight is the influence of gravitational force acting on any mass of the object. So in the present case, the weighing force given is equal to the gravitational force acting on the rocket. Thus, the gravitational force will be acting towards downward direction. But an upward force is required by the rocket for thrusting purpose and that force is given as upward force. So the net force acting on the rocket is the vector addition of all the forces acting on the rocket. As in this case, only upward and downward force is acting on the rocket. The vector addition will be equal to subtraction of downward acting gravitational force from upward force or force provided by engine.

Net force = Engine force - Gravitational force = 890000-43600=846400 N

So the net force acting on the rocket is 846400 N.

Final answer:

The net force on the rocket is the difference between the upward thrust and the weight of the rocket. However, once the rocket reaches constant velocity, the net force is zero, assuming no changes in other forces acting on the rocket.

Explanation:

The net force on the rocket can be calculated using Newton's second law of motion, which states that the net force is equal to the mass times acceleration (F = ma). To find the net force, the weight of the rocket (gravitational force acting downward) needs to be subtracted from the upward thrust provided by the engine.

Fnet = Fthrust - Fweight

If we are not given the mass of the rocket or information about changes in the velocity to calculate acceleration, it's assumed that the rocket is in a constant velocity phase of its flight, meaning the net force equals to zero, since acceleration is zero. If acceleration were to be considered, it would've been calculable only with additional information pertaining to the time it takes to reach that velocity or change in velocity over time.

In the example provided, the weight of the rocket is 4.36 x 104 N and the thrust is 8.90 x 105 N. Once the rocket reaches its maximum speed, the acceleration is zero, and therefore the net force should also be zero as it will be cruising at a constant speed, provided there is no change in the forces acting on the rocket.

If C moves to position 5 (60 meters), the average velocity during these 5 seconds is 12m/s

Explanation:

Velocity can be defined as the rate of change of position with respect to the time.Velocity is the vector quantity as it indicates displacement direction and time.Average velocity of an object is total displacement by total time.

Velocity can be calculated by using formula v=d/t. where v=velocity, d=distance and t= time duration.

Average velocity can be calculated by,  v= (Δx)×(Δt) Where Δx is the total displacement of the body and ∆t is the time.

The SI unit of velocity is m/s.

Answer:

12 m/s

Explanation:

The average velocity is simply the change in displacement over the specified time interval. In this case we have a total of five intervals, which represents 5 seconds. Dividing 60 m by 5s, gives us 12 m/s, which is the magnitude of the average speed in the interval.

Explanation:

1) Newton's first law of motion states: "an object in motion stays in motion, and an object at rest stays at rest, until acted upon by an unbalanced force."

When you're riding in a car, your body is moving forward.  When the car turns left, your inertia keeps you moving forward.  This means the car moves left from underneath you, which makes it feel like you're moving to the right, even though there's no net force pushing you.

2) When you're standing on the ground, the Earth's gravity pulls on you with a force equal to your weight.  You push back on the Earth with an equal and opposite force called "normal force".

Answer:

A wheel and axle may either increase or decrease the input force, depending on whether the input force is applied to the axle or the wheel. ... Because the output force is less than the input force, the mechanical advantage is less than 1. However, the wheel turns over a greater distance, so it turns faster than the axle.

If you apply a force to the wheel (the handle), the wheel spins and multiplies the effort to make the output force of the axle (shaft) greater.

The drive shaft, which on most cars runs the length of the vehicle to the rear wheels, turns as the combustion engine burns gasoline. The turning drive shaft sends power to the rear axle and wheels, which cause them to turn as well, moving the car forward

There some moments when the steering wheel becomes stiff and hard to turn. From irregular servicing, lack of fluid oil to low tyre pressure or bad wheel alignment, any of these could be the cause

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Answer:

A. 1.11[mL/g]

Explanation:

We have to remember the expression to calculate the density, which says it's the relationship between mass and volume.

We can calculate the different densities for each of the samples.

density1 = m/V = 200/180 = 1.11[mL/g]

density2 = m/V = 300/270 = 1.11[mL/g]

density3 = m/V = 400/270 = 1.11[mL/g]

According to the initial data, we can determine that the density corresponds to 1.11 [mL/g]

Answer: the frequency of the oscillation is given by ω=√(k/m)=√(18.9/2.5)=2.75.  Keep in mind this is angular frequency, i.e. radians per second, not wavelengths per second.  So the displacement can be written in the form

y = R*sin(2.75*t - δ)

Here δ is just the time offset and for our purposes is pretty irrelevant.  You can in fact set it to zero since we can say we begin timing when the mass crosses equilibrium.  So

y = R*sin(2.75*t)

We want to find a way to use the information "At the equilibrium position, it moves 2.89 m/s."  I am going to use some calculus here since it makes things so much easier.  If you haven't taken calculus yet, most likely your course has given you a formula to use instead.

 We know y=0 when t=0, so y is at equilibrium when t=0.  To say it moves 2.89 m/s is then to say that

y'(0) = 2.89.

From here we can differentiate the displacement function, set t=0 and solve for R.  Using the chain rule:

y'(t) = 2.75*R*cos(2.75*t)

y'(0) = 2.75*R

2.75*R = 2.89

R = 1.051

Explanation: Since this is harmonic motion we can assume there is no damping force

Answer:

its .33

Explanation:

trust me

Answer:

c. 2 J

Explanation:

since u just multply it

Answer:

100Kg.m/s

Explanation:

From the question, we obtained the following information:

M= Mass = 25kg

V = Velocity = 4m/s

Momentum =?

Momentum = MV = 25x4= 100Kg.m/s

Answer: The answer is 1

Explanation:

because the atoms and nuclear

Answer:convection

Explanation:

Convection can cause convection

Answer:

conduction is the answer

Explanation:

Answer:

The kinetic energy

Explanation:

The value of Ek represents the kinetic energy of a body and it is defined by the following equation

[tex]E_{k}=\frac{1}{2} *m*v^{2} \\[/tex]

where:

m = mass [kg]

v = velocity [m/s]

Ek = kinetic energy [J]

The equation [tex]\rm \(E_k = \frac{1}{2} m \times v^2\)[/tex] represents the kinetic energy [tex]\rm (\(E_k\))[/tex] of an object in motion. In this equation, [tex]\rm \(m\)[/tex] represents the mass of the object, and [tex]\rm \(v\)[/tex] represents its velocity.

Kinetic energy is the energy an object possesses due to its motion. The term [tex]\rm \(\frac{1}{2} m \times v^2\)[/tex] calculates the kinetic energy by taking half of the product of the object's mass and the square of its velocity.

As an object's speed increases, its kinetic energy also increases, and kinetic energy is directly proportional to both the mass and the square of the velocity of the object.

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Answer: Stationary reference points are used to determine if a object is in motion because if the reference point is still,you will be able to see if the object is in motion. If you had a reference point that wasn't stationary, you wouldn't be able to tell if the object was in motion.

Explanation:

Stationary reference points are used to determine if a object is in motion because if the reference point is still,you will be able to see if the object is in motion. If you had a reference point that wasn't stationary, you wouldn't be able to tell if the object was in motion.

Choosing a stationary reference point is important to determine motion because motion is relative and can appear differently from different reference frames.

A stationary reference point is usually chosen to determine whether an object is in motion because motion is a relative term. When we observe motion from a reference point that is stationary, we can easily identify the displacement and velocity of the object. For example, if we are in a car that is moving at a constant velocity, it may be difficult to determine whether an object inside the car is moving or not. However, if we observe the same object from outside the car, from a stationary reference point, we can clearly see whether it is in motion or not.

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The Energy stored in the spring is 0.196 joules(0.2 joule)

Here mass = 2.0 kg

the length for which the spring extended 'x' = 2 cm

since 1m =100cm, therefore 2cm will be equal to 0.02 m so x=0.02m

Acceleration due to gravity or 'g'= 9.8 m/s^2

We have to find E = ? joules

Solving for the spring constant k

F = kx

F=mg

Therefore,

mg = kx

k = mg / x

k = 2.0 kg * 9.8 m/s^2 / 0.02 m = 980 N / m

Solving for the energy stored in the spring

E = 1/2 * k * x^2

E = 1/2 * 980 N / m * (0.02 m)^2

E = 0.196 joules

The energy stored in the spring will be 0.196 joules.

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The correct answer for 5 is Electrons

Answer: x= 75

Explanation:1x -3y = 30

And y = 15

Substitute y accordingly into the equation, so that

x - 3(15) = 30

x-45=30

Add 45 to both sides if the equation

x-45+45=30+45

x=75

Answer:

B. Earth, Venus, Mercury

Explanation:

Answer:

counseling psychologist

Answer:

Circuit breakers

Explanation:

This is an automatic device designed for stopping the flow of current in an electric circuit as a safety measure.

Ground Fault Circuit Interrupters (GFCIs), circuit breakers, and fuses are designed to interrupt the current flow of electricity when unsafe conditions arise.

Ground Fault Circuit Interrupters (GFCIs), circuit breakers, and fuses are all designed to interrupt the current flow of electricity when unsafe conditions arise. GFCIs are specifically designed to detect ground faults, which occur when current leaks to the ground, and they quickly shut off the power to prevent electric shocks. Circuit breakers monitor the current flowing through a circuit and trip when the current exceeds a certain threshold, protecting against overloads and short circuits. Fuses also protect against overloads and short circuits by melting and interrupting the current flow.

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1) The ratio between the number of turns of the two electromagnets is 2

2) The ratio between the number of paper clips picked up is 2.2

Explanation:

1)

An electromagnet is a device consisting of a coil of wire wrapped around an iron core. Such a device is able to create a magnetic field, and in this problem this is used to attract and pick up the paper clips.

In this problem, we have two electromagnets:

- The first one has 50 turns

- The second one has 25 turns

Therefoore, the ratio of the number of turns of the 50-turn electromagnet to the number of turns of the 25-coil electromagnet is:

[tex]\frac{N_1}{N_2}=\frac{50}{25}=2[/tex]

2)

The strength of the magnetic field produced by an electromagnet is directly proportional to the number of turns in the coil wrapped on the electromagnet:

[tex]B\propto N[/tex]

This means that the electromagnet with more turns will produce a stronger magnetic field, and therefore it will be able to pickup more paper clips.

In this problem, in fact:

- The electromagnet with 50 turns can pick up 13 paper clips

- The electromagnet with 25 turns picks up 6 paper clips

Therefore, the ratio of the number of paper clips picked up is:

[tex]\frac{p_1}{p_2}=\frac{13}{6}=2.2[/tex]

And we see that this ratio is approximately equal to the ratio of the number of turns, which is 2.

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Answer: 1.5×10^10 N/C

Explanation:

E= F/q

Where E= magnitude of the electric field

F= force of attraction

q= charge of the given body

Given F= 6.5×10^-8 N

q= 4.3× 10^-18 C

Therefore, E = 6.5×10 ^-8/ 4.3×10^-18

E = 1.5×10^10 N/C

Answer:

1.5*10^10 N/C

Explanation:

The Force per Charge Ratio

Electric field strength is a vector quantity; it has both magnitude and direction. The magnitude of the electric field strength is defined in terms of how it is measured. Let's suppose that an electric charge can be denoted by the symbol Q. This electric charge creates an electric field; since Q is the source of the electric field, we will refer to it as the source charge. The strength of the source charge's electric field could be measured by any other charge placed somewhere in its surroundings. The charge that is used to measure the electric field strength is referred to as a test charge since it is used to test the field strength. The test charge has a quantity of charge denoted by the symbol q. When placed within the electric field, the test charge will experience an electric force - either attractive or repulsive. As is usually the case, this force will be denoted by the symbol F. The magnitude of the electric field is simply defined as the force per charge on the test charge.

ELECTRIC FIELD STRENGTH= FORCE/CHARGE

If the electric field strength is denoted by the symbol E, then the equation can be rewritten in symbolic form as

E=F/q

I got this from electric field intensity; physics classroom.

https://www.physicsclassroom.com/class/estatics/Lesson-4/Electric-Field-Intensity

and please no one should report me. was just trying to help. And I already got a warning. PLEASE!!! THANK YOU VERY MUCH.

and also this picture of me doing the test explains everything

.Hope I helped

Answer:

The dimensions of angular velocity is [tex][T^{-1}][/tex]

Explanation:

We know that linear velocity is equal to the rate of change of linear displacement.

Similarly, in rotational motion, the analogous term for linear velocity is angular velocity.

Angular velocity is defined as the rate of change of angular displacement.

The angular displacement is the measure of the angle rotated by an object about a fixed point or the axis of rotation.

Therefore, the unit of angular displacement is measured in radians. We know that, the radian is a dimensionless quantity. So, its dimension is [tex][M^0L^0T^0][/tex]

Now, time is measured in seconds. So, dimension of time is [tex][M^0L^0T][/tex]

Therefore, the dimensions of angular velocity is given as:

[tex]Angular\ velocity =\frac{Angular\ displacement}{Time}\\\\Dimensions=\frac{[M^0L^0T^0]}{[M^0L^0T]}\\\\Dimensions =[T^{-1}][/tex]

Therefore, the dimensions of angular velocity is [tex][T^{-1}][/tex]

Answer:

The net force on the frog is  zero Newton.

Explanation:

Balance forces are 2 forces that is acting in opposite directions on an object, and equal in size. Anytime there is a balanced force on an object, the object stays still or continues moving continues to move at the same speed and in the same direction

In Figure , the forces exerted on the frog is equal in magnitude and opposite in direction.

Hence

The force , F1 = 200 N and F2 =  -200 N since it is acting in opposite direction

Now the net force =F1 + F2 =  200 - 200 = 0

Answer:

1.13m

Explanation:

From the question, we obtained the following information:

W = 2J

m = 180g

We must convert this gram (i.e 180g) to kg

1000g = 1Kg

180g = 180/1000 = 0.18kg

g = 9.8m/s2

h =?

w = mgh

h = w / mg

h = 2 / ( 0.18x9.8)

h = 1.13m

Answer: D

Explanation:

The graph that represents an object increasing its position with a constant velocity is Graph B because a straight, diagonal line indicates the object is moving with a constant velocity, and a positive slope means it is increasing its position. Hence, option (D) is correct.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Mathematically:

velocity = ( final position - initial position)/time interval

Hence,

Final position = initial position + velocity ×time interval

Hence, the x-t graph of a  object with constant velocity, is linear in nature with a positive slope. Hence, graph (B) is the correct option.

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A constant change of direction implies ongoing alterations in the course of movement, typically involving centripetal acceleration. A merry-go-round and a wind vane demonstrate this, while a kid walking straight does not.

"A constant change of direction" refers to a situation where an object or point is continually altering the course of its movement. In the context of physics and motion, this typically indicates the presence of centripetal acceleration, which is the acceleration directed towards the center of a circular path that keeps an object moving in a curve rather than a straight line.

A merry-go-round spinning in circles displays a constant change of direction due to the rotational movement with each point on the ride continuously changing its direction as it moves in a circle.

A wind vane swinging around also shows a constant change of direction as it repeatedly changes which way it's pointing due to shifting wind directions.

A kid walking on a straight path does not exhibit a constant change of direction because the motion is linear and not curved.

Yo sup??

the correct answer is option B ie

B. transfer of heat between two objects that are touching .

Hope this helps.