A block is pushed across a 10 m rough surface quickly by a boy. Which of the
following would not increase the power needed by the boy to move the block?
A)Decrease the time of the block slid
B)Increase the mass of the block
C)Increase the time of the block was slid
D)Increase the roughness of the surface

The RMS current , Power and Maximum voltage have values 0 to 1 , V1/2 to 0 and infinity to zero.

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Answer:

[tex]\huge\boxed{\sf K.E. = 16 \ J}[/tex]

Explanation:

Mass = m = 3 kg

Speed = v = 4 m/s

Kinetic Energy = K.E = ?

[tex]\displaystyle K.E. =\frac{1}{2} mv^2[/tex]

[tex]\displaystyle K.E. =\frac{1}{2} (3)(4)^2\\\\K.E. =\frac{1}{2} (3)(16)\\\\K.E. = (2)(8)\\\\K.E. = 16 \ J\\\\\rule[225]{225}{2}[/tex]

Answer:

i think it would be radiation since its warming up

hope this helps

please desperate need brainliest

Explanation:

Answer:

B

Explanation:

always opposing the forward force which is the direction of the acceleration of the car.

The object that had a mass of 4 kilograms and was lifted at a rate of 3 m/s has a greater kinetic energy.

We know that the kinetic energy has to do with the energy of an object that is in motion. Thus the kinetic energy is the energy that is said to be possessed by a moving object.

In the first case we have;

Kinetic energy = 1/2 mv^2 = (0.5 * 2 * 2^2)

= 4 J

In the second case;

Kinetic energy =  1/2 mv^2 = (0.5 * 4 * 3^2)

= 18 J

The second object had more kinetic energy.

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The energy output is 714 Watts is loss.

According to the thermal conductivity equation, the rate of heat loss H is given by:

H=\swhere,

K is the heat conductivity coefficient.

A is for Area of Cross Section.

H = Heat loss rate

Temperature differential between the two sides of the body in the given situation: x-Thickness of the material 71 -1

T = 37°C, or body temperature, and 12°C, or room temperature

initial instance.

A=2m x=0.01 m

H=174watt

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The option that would not increase the power needed by the boy to move the block is "Increase the time of the block was slid".

Option D is the correct answer.

The power applied by the boy to push the block across the 10 m rough surface is the measure of the energy expended over a given time interval.

Mathematically, the power applied by the boy is given as;

P = E/t

where;

P = (F x d)/t

where;

According to Newton's second law of motion, the applied force is given as;

F = ma

P = (ma x d) / t

where;

From the formula above, the following will increase the power needed by the boy to move the block.

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The greater value of work for object A can be true if object B is pushed at a much smaller distance. Therefore, option B is correct.

Work can be described as the energy utilized when a force is exerted to move a body through a specific distance. The work done describes both the exerted force as well as the displacement of the object.

The action of the applied force is to move a system in a straight line in the direction of the exerted force over a distance 'd'.

W= F ×d

Where 'd' is the displacement by an object, F' is the exerted force, and W is work done.

Given the force experienced by the object B is greater than object A:

[tex]F_{B} > F_A[/tex]

Now we know that the work done only depends upon the force and distance. In order to have a greater value of the work for object A. Object B is pushed a much smaller distance than object A.

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The angular velocity of a car tire is 1 rad/s.

What is angular velocity?

Angular velocity is the speed at which the angle between two bodies changes when an object rotates or revolves around an axis. This displacement is depicted in the image by the angle formed by a line on one body and a line on the other.

We know,

Angular velocity = ω = [tex]\frac{V}{R}[/tex]

Given,

V = 30 m/s

R = 30 cm

Putting values in the formula

ω = [tex]\frac{30}{30}[/tex] rad/s

= 1 rad/s.

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The acceleration of the object is 1.375 m/s².

Given that, mass of the object = 8kg

Fa = 43 N acts towards right

Fb = 54 N acts towards left

Let us consider left as the positive sign convention.

Fb - Fa = 54 - 43 = 11 N

From, Newton's second law of motion, we know, F = m * a

where, F is the force

m is mass

a is acceleration

Substituting the values in the above equation, we have,

11 = 8* a

Acceleration a = 11 / 8 = 1.375 m/s²

Thus, the acceleration of the object is 1.375 m/s².

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A solid sphere of radius R is placed at a height of 40 cm on a 15∘ slope. It is released and rolls, without slipping, to the bottom. A circular hoop of radius R be released on the same slope in order to equal the sphere's speed at the bottom with height of 57.14 cm

The height that a circular hoop should be released can be calculate as follows:

Generally the equation for the potential energy of the sphere is mathematically given as

mgh= 1/2Iw² =1/2 mv²

where,

inertia of sphere

I = 2/5 mr²

and

angular velocity

w = v/r

therefore, we can input inertia of sphere and angular velocity to potential energy equation

mgh= 1/2Iw² =1/2 mv²

mgh = 1/2 ( 2/5mr²) ((v/r)² + 1/2mv²

mgh = 1/2 ( 2/5(v/r)²mr²) + 1/2mv²

mgh = 1/5 mv² +  1/2 mv²

mgh = 7/10 mv²

v² = 10gh

        7

generally the equation for the inertia of circle of sphere is mathematically given as

I = mr²

mgh = mv²

h = v²/g

therefore h = 10gh/7

                        g

h = 57.14 cm

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Answer:

Explanation:

The reaction force to the action force during a rocket launch would be the force exerted by the ground or launch pad on the rocket. The action force is the force of explosion from the burning fuel and expanding gases, which propels the rocket upward. The reaction force is the force exerted by the ground or launch pad in response to this action force, which keeps the rocket grounded and prevents it from moving. The action and reaction forces are equal in magnitude but opposite in direction, and they act on different objects. The action force acts on the rocket, while the reaction force acts on the ground or launch pad.

The mass of an 8oz styrofoam cup is approximately 227 grams .

The mass of a substance is a measure of the quantity of matter present in that substance,

The mass of a substance is measured with a chemical balance and is independent of gravity. The SI  unit of the mass of a substance is the kilogram. kg.

Other smaller multiples of the kg include grams, milligrams, centigrams, etc.

Some other unit of measurement of the mass of a substance is ounces (oz), pounds (lb), tonnes (t), etc.

The conversion from ounces to gram is 1 oz = 28.3495 grams

Hence, 8 oz = 8 * 28.3495 grams

8 oz = 226.796 grams or approximately 227 grams

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The sound source emits a sound of frequency of 180 Hz, its wavelength is 1.91 m.

The relation between wavelength and frequency of sound is given as

v = f * λ

where, v is the velocity of sound in air

f is the frequency of sound

λ is the wavelength

Given that, frequency of sound is 180 Hz

We know that, speed of sound in air is 343 m/s

Now, let us find out the wavelength of sound in air.

v = f * λ

343 = 180 * λ

λ = 343 / 180 = 1.91 m

Thus, wavelength the  of sound in air is found to be 1.91 m.

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The magnitude of dog's displacement vector in the due west direction is 0.65 km.

It is given that, a dog walks 0.64km due north.

It is also given that the magnitude of dog's total displacement is 0.91 km.

The magnitude of dog's displacement vector in the due west direction can be found by using Pythagoras theorem.

It is mathematically represented as, c² = a² + b²

Given, c = 0.91 km

a = 0.64 km

b =?

Making b as subject, we have,

b² = c² - a²

b = √(c² - a²) = √(0.91² - 0.64²) = 0.65 km

Thus, the magnitude of dog's displacement vector in the due west direction is 0.65 km.

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Grid-Tied Residential Solar Cells energy technique (or technology(s)) can keep producing electricity after the sun sets for a while.

Solar energy collectors and photovoltaic solar systems are two ways that human ingenuity has created to harness solar energy and convert it into electricity. A solar thermal process utilizes the heat from the sun to create steam, which powers a turbine and ultimately creates electricity.

In addition to the components that convert the immediate (DC) electricity generated by modules into the ac current (AC) electricity needed to power all of the home's appliances, systems also feature mounting structures that guide panels toward the sun.

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Grid-Tied Residential Solar Cells energy technique (or technology(s)) can keep producing electricity after the sun sets for a while.

Solar energy collectors and photovoltaic solar systems are two ways that human ingenuity has created to harness solar energy and convert it into electricity. A solar thermal process utilizes the heat from the sun to create steam, which powers a turbine and ultimately creates electricity.

In addition to the components that convert the immediate (DC) electricity generated by modules into the ac current (AC) electricity needed to power all of the home's appliances, systems also feature mounting structures that guide panels toward the sun.

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Answer:

because they can all blend in with different surroundings

Bay Medical Company's genetic researchers are interested in spiders with medium silk flexibility. They believe this silk can be employed in medical applications such as stitching and constructing artificial tendons.

Siblings may inherit various features from their parents and from each other depending on the specific gene combinations that each seeds carries. The variance in silk inflexibility among spider seed is explained by random gene recombination.

The inflexibility of silk is another issue. This point is shared by all of Darwin's dinghy spiders (they all have spider silk with some flexibility), yet some spiders create silk that is more flexible than other spiders' silk. There are three levels of silk inflexibility: high, medium, and low.

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If a child on a swing has a center of gravity 4.54 m just below pivot, it takes her T =4.05s to complete one swing.

But in a larger sense, gravity is a force because it represents the interaction that happens when two masses are in close proximity to one another. Fundamentally, the warping of reality and the motion of entities through the stretched spacetime are what produce gravitational effects. However, the outcome appears to be the result of applying force.

Dr. Ryan Stone, played by Sandra Bullock, returns to Earth at the end of "Gravity" and crashes into a lake. After taking off her spacesuit, Dr. Ryan swims towards the surface but initially finds it difficult to stand up straight.

Briefing:

T=2π√(l/g)

T=2π√(4.54/9.81)

T=4.052s

T =4.05s

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From the case we know that:

Please refer to the image below.

We know from the case, that:

m = 2M

r = R

m2 = 1/2M

distance between the center of mass to point P = p = R

Distance of the point mass to point P = d = 2R

We know that the moment of inertia for an uniform flat disk is 1/2mr². Then the moment of inertia for the uniform flat disk is:

Icm = 1/2mr²

Icm = 1/2(2M)(R²)

Icm = MR² ... (i)

Next, we will find the moment of inertia of the disk with respect to point P. We know that point P is positioned at the arc of the disk. Hence:

Ip = Icm + mp²

Ip = MR² + (2M)R²

Ip = 3MR² ... (ii)

Then, the total moment of inertia of the disk with the point mass is:

I total = Ip + I mass

I total = 3MR² + (1/2M)(2R)²

I total = 3MR² + 2MR²

I total = 5MR² ... (iii)

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The 400 A current flowing through the wire will be going the other way from the other wire.

An electroscope is a straightforward instrument that consists of a metal piece protruding from a glass jar with thin metal leaves suspended inside. This design demonstrates the electrostatic repulsive force. The leaves spread apart by the Coulomb force when a charged body touches the external metal piece.

We will apply the equation to determine the current in the other wire

F/l = µ₀I₁I₂/2πr and solve it for I₂.

The other wire's current will flow in the opposite direction to the first one because the force is repulsive.

I₂ = F.2πr/µ₀I₁l

I₂ = 4×2π×0.05m/4π×10⁻⁷T.m/A×1000A×2.50m

I₂ = 400 A.

The 400 A current flowing through the wire will be going the other way from the other wire.

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Answer:k

Explanation:k

k

Answer:

No

Explanation:

Writing a sentence in your notebook with your pencil is not a reflex action because that is not a inborn talent you have to practice so that you can write.

For example moving your hand away when you touch a hot water is a reflex action and you don't have to train yourself to move your hand... in simple its natural

If a pencil goes from such a perfectly vertical position while maintaining its angular acceleration, the time it takes for it to hit the ground is 0.4299s.

Angular acceleration is the term used to describe the temporal pace at which angular momentum varies. The formulae per cent per seconds measure unit is the norm. Therefore, = d d t. Angular velocity is also known as rotating acceleration.

Angular acceleration is measured in rad/s/s, or rad/s2. If grows, then the result is good. If falls, then falls is negative.

angular acceleration, τ = I α

Wr = I α

sin 10 = r / (L/2)

r = L/2 sin 10

A inertia moment will then occur:

I = 1/3 M L²

αf = 3/2 g / L sin 10

α = [3/2 × 9.8] / [0.150 sin10]

α = 17 rad/s²

θ = π / 2

t = √(π / α )

t = √(π / 17)

t = √3.142 / 17

t = 0.4299s

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The albedo of the object is 90% and the color which is most likely to be its is black.So,correct option is c.

A photon reflected from a white wall can unquestionably be reflected from another white wall. In any case, the reflection can't happen always, on the grounds that no genuine wall can mirror 100 percent of the light radiated on it.

On the off chance that a wall is blue, that implies that it reflects blue photons well, and doesn't reflect as numerous photons of varieties that aren't blue.

Since,it is given that 90 of photons are absorbed,it means 90% photons are not able to eject  out the electrons from the metal.Therefore,albedo of the object will be 90%.
We know very well that for black color number of photons are absorbed highest.Since 90% of photons are absorbed therefore,the best choice of color is black.

Hence,option c is correct.

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(Complete question) is:

if 100 photons of light hit an object, and 90 of them are absorbed, but zero are transmitted, zero are scattered and zero are refracted: what is the albedo of the object, and what is most likely to be its color?

a)10%; black

b)0%; black

c)90%; black

d)90%; white

e)10%; white

The sum of the external forces and torques acting on an object must be zero if the object is at rest.

We can infer from answer options that the body may have constant linear or constant rotational velocity, or both simultaneously, if the total of the external forces and total of the external torques acting on it are both zero.

If the thing has zero net force and zero net torque, the object is in equilibrium.

The total force acting on an object is summed up into a vector as the net force. When anything is in equilibrium, whether it's at rest or moving at a constant speed, there is no net force acting on it. Only a vector with zero components can have zero magnitude.

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Percentage of the vehicle's kinetic energy is stored in the wheels is 9.64%

Kinetic energy is the energy possessed by the object due to its motion. [ It is defined as the work required to accelerate a body of specified mass from rest to a specified velocity. After the body acquires this energy during acceleration, it retains this kinetic energy as long as the velocity does not change. The same work is done when the body slows down from its current speed to rest. Formally, kinetic energy is any term in the Lagrange of a system that includes the time derivative.

 In relativistic mechanics, this is a good approximation only if v is much smaller than the speed of light. The standard unit for kinetic energy is the joule, while the British unit for kinetic energy is the foot-pound.

I = rg2*m

rotational KE of wheels  = 0.5Iω2= 0.5(rg2*m)*(v/r)2

4KE = 2(rg2*m)*(v/r)2 = 2(9.92*34)(792/11.12) = 337588.41

total kinetic of wheel = 4(0.5mv2) + Rotational KE = 761976.41

KE of car = 0.5mv^2 + Rotational KE wheel = 7904800.91

% =(Total KE of wheel / Total KE of car)*100 = 9.64%

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The tangential velocity must block a have so that block b remains at the same height under the table is rw.

[tex]Vtan=Rw\\\\R=path\\\\w=angular- velocity\\\\Vtan=Tangential-Velocity[/tex]

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No, if The cross-sectional diameter of a vessel increases in an aneurysm. Considering that blood is roughly non-viscous and incompressible and that there is a laminar flow,

A non-viscous fluid is one that offers zero resistance to internal friction or has no resistance at all. A fluid is described as being viscous if there is greater flow resistance.

Because of their high viscosity, some liquid, like pitch, glass, and peanut butter, act like solids. A liquid is referred to as "viscous" in common parlance if it has a viscosity that is clearly higher than water, and "mobile" if it has a viscosity that is noticeably lower.

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Answer:

I don't know

Explanation:

I don't know