The diagram shows what happens when a polythene rod is rubbed with a dry cloth. Select the statements that are true

The statement as it has been written in the question is false. This is because, the upthrust must be equal to the weight in order for the object to float.

The principle of floatation states that an object would float in water when the upthrust on the object is equal to the weight of the object. We know that the upthrust is the force that acts on an object thereby throwing it up. The weight is the force that tries to sink the object into the fluid.

Given the statements above, it is false that; the plastic spoon float because the upthrust is more than the weight of the metal spoon so the upthrust pulls it up to float.

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Energy can neither be created nor destroyed. It can only be transferred from one object to another.

Claim 2 is correct.

Energy cannot be created or destroyed. So, objects can not make their own energy.

Energy can be transferred or transformed. Energy can be changed in many ways, such as conversion of kinetic energy into potential energy and vice-versa, when one object moves another object, etc.

For example, to lift an object against the gravity, work is done on the object. This work is converted in the form of potential energy, called as gravitational potential energy. When an object, say an apple falls towards Earth from a tree, gravitational potential energy is converted into kinetic energy.

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The acceleration of the spherical shell is determined as 6.37 m/s².

The friction force is 12.74 N.

The coefficient of friction of the surface is calculated as follows;

Fsinθ = μFncosθ

where;

mg(sin θ) = (μmg) cosθ

(sin θ) = μ cosθ

μ = sinθ/cos θ

where;

μ = tan θ

μ = tan(33)

μ = 0.65

The acceleration of the spherical shell is calculated as;

a = μg

a = 0.65 x 9.8 m/s²

a = 6.37 m/s²

The frictional force is calculated as follows;

Ff = μmg

Ff = 0.65 x 2 x 9.8

Ff = 12.74 N

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Energy flow in an needed for the deer to eat starts at the sun which produces all the energy needed for life. Then comes the producers, the autotrophs(plants). These organisms harness the energy of the sun and convert it into sugars. Then deer which eat the autotrophs get the next most energy.

One of the key components that enables the survival of such a large number of organisms is the energy flow within the ecosystem. Solar energy is the main source of energy for almost all living things on Earth.

It is interesting to learn that less than 50% of the sun's actual radiation reaches Earth. The radiation that plants can use to perform photosynthesis is the radiation that is considered to be effective.

Through the food chain and food web, energy is transferred. Being the energy producers, plants use their chloroplasts to absorb sunlight, part of which is converted into chemical energy during the process of photosynthesis.

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The buoyant force if the box was completely submerged is 93.84 N.

The length of the box is 40.8 cm.

The height of the box is 10.4 cm and the depth of the box is 19 cm.

Now we know,

1 m = 100 cm

So,

1 cm = 0.01 m

Therefore,

Length, L = 40.8 cm = 40.8 × 0.01 = 0.408 m

Height, H = 10.4 cm = 10.4 × 0.01 = 0.104 m

Depth, D = 19 cm = 19 × 0.01 = 0.19 m

The density of the fluid is 1187 kg/m³.

ρ = 1187 kg/m³ = 1187 × 10³ g/m³

The mass of the box, m = 2325.4 g

The maximum buoyant force will be:

F = ρgV

Here g = 1 g cc

Therefore,

F =  1187  × 1 × ( 0.408 × 0.104 × 0.19 )

F = 93.846590 N

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The dimension of stress is M1 L-1 T-2  and the unit of frequency is Hz.

What is the frequency?

The frequency with which something happens over a specific time frame or sample

Let us find out the dimension of stress.

Stress = Force/Area      

Force = mass * acceleration

Stress=  M * L * T-2/ L2

Therefore, Stress = M L-1 T-2

As for the second question,

The unit of frequency is Hz (Hertz)

Hence, the dimension of the stress = M L-1 T-2  and the unit of frequency is hertz.

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Answer:

w=2160kJ

Explanation:

work=power × Time

w=pt

p=600W

t=60min×60sec=3600

w=600 × 3600

w=2160000joules(J)

w=2160kJ

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Answer:

Taking into account the table we get that, for n = 2, the velocities of sound waves are

Velocity on air: 267.3 m/s

Velocity on helium: 260 m/s

Velocity of carbon dioxide: 829.3 m/s

The velocity of the sound travels at different speeds in each gas because the velocity depends on the properties of the medium like the density. Since the air, helium, and carbon dioxide have different densities, the sound speed will be different.

The escape velocity of the planet is [tex]\sqrt{gR\\}\\[/tex] when mass is M and radius is 2R.

[tex]v_{e} = \sqrt{2gR}[/tex]

Where, Ve is the escape velocity, g is gravity , and R is the radius of the earth.

If a planet has mass M and radius 2R then an expression for the escape velocity from the planet can be calculated as,

[tex]v_{e} = \sqrt{(2GM)/R[/tex]

Here, G is the gravitational force of the planet therefore Newton's law of gravitational force can be used as,

g = GM/R²

gR²= GM

Thus, with the help of above equations the escape velocity of the planet can be calculated when mass is M and radius is 2R i.e.

[tex]v_{e} = \sqrt{(2GM)/2R[/tex]

[tex]v_{e} = \sqrt{(2GR)/2R[/tex]

[tex]v_{e} = \sqrt{gR[/tex]

Therefore , the escape velocity of planet is equal to the root of gravity g and radius R .

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To find

What is thermodynamics

Explanation

Thermodynamic study about the transfer of energy to and fro from a system.

Thus thermodynamics is the movement of heat

Conclusion

The correct option is movement of heat

With the use of first equation of motion, the ball will be going with a velocity of - 51 m/s

Velocity is the distance travel in a specific direction per time taken. It is a vector quantity and it is measured in m/s

Given that a punter kicks the ball high enough that it spends 5.2 seconds in the air. To know how fast was it, let us assumed that the initial velocity u of the ball is zero. The ball will be moving under the influence of gravity.

To find the velocity, let us use first equation of motion. That is,

v = u - gt

where

Substitute all the parameters into the equation

v = - 9.8 × 5.2

v = - 50.96 m/s

Therefore, the ball will be going as fast as -51 m/s when it left his foot.

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The average velocity of a car driving down the highway if it’s displacement is 123 m west during a time period of 14.0 s is 8.79 m/sec.

The rate at which an object's position changes when observed from a specific point of view and when measured against a specific unit of time is known as its velocity. Unit of velocity is m/sec.

Given in the question a car driving down the highway  it’s displacement is 123 m west during a time period of 14.0 s then the average velocity is given as,

Average velocity = displacement / time

                            = 123/14

                            = 8.79 m/sec

The average velocity of a car driving down the highway if it’s displacement is 123 m west during a time period of 14.0 s is 8.79 m/sec.

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Explanation

Coulomb's law states that the electrical force between two charged objects is directly proportional to the product of the quantity of charge on the objects and inversely proportional to the square of the separation distance between the two objects.

where k is the coulomb constant

Step 1

let

now, replace.

I hope this helps you

Take into account that for any repeated measurements, the formula of percentage uncertainty is given by the following formula:

Then, for the percentage uncertainty of density. mass and volume, just use the information about half the range and average reading for each magitude (volume, density and mass)

Consider that half the range is one half the subtraction between the maximum and minimum measurement:

When data stored digitally are copied then data are copied quickly, easily, and perfectly.

Data stored digitally are quickly, easily and perfectly copied.

Data is a collection of quantities, photos or videos, signs or symbols, on which operations are performed by a computer, which can be stored and transmitted in the form of electrical signals and recorded on magnetic, optical or mechanical recording media.

Since no quality of the file is lost, copying a data is an easy, quick and a perfect process.

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The distance travelled by the car along the plane is 29.56 m.

The acceleration of the car down the incline is calculated by applying Newton's second law of motion as shown below;

F - Ff = ma

where;

frictional force acting on the car, Ff = μmg cosθ

0 - μmg cosθ = ma

-μmg cosθ = ma

-μg cosθ = a

where;

a = -(0.45 x 9.8 x cos11)

a = -4.33 m/s²

The distance travelled by the car along the plane is calculated as follows;

v² = u² + 2aL

where;

0 = (16²) + 2(-4.33)L

0 = 256 - 8.66L

8.66L = 256

L = 256/8.66

L = 29.56 m

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Use the Newton's Second Law of Motion to find the tension in the rope on each case.

a)

Since the gymnast climbs at a constant speed, then the net force acting on the gymnast must be 0. Since there are only two forces acting on the gymnast, namely the tension of the rope and the weight of the gymnast, then:

On the other hand, the weight of the gymnast is equal to the product of its mass times the acceleration of gravity, g=9.81m/s^2:

Then, the tension of the rope is:

b)

The forces acting on the gymnast are 2: the tension of the rope and the gravitational pull:

From the second law of motion, we know that the net force acting over an object of mass m produces an acceleration a given by:

Then:

Substitute W=588N, m=60kg and a=1.50 m/s^2 to find the tension of the rope:

Therefore, the answers are:

Since the load Joe is carrying is equal to the supporting weight, the mass of the load will be 90 Kg

Weight is the gravitational pull of an object under the influence of acceleration due to gravity.

Given that Joe is carrying a load of supplies and likely injuring his back by supporting 882 N of weight.

The load Joe is carrying will be equal to 882 N

To calculate the mass of what he is carrying, let us use the formula

W = mg

Where

882 = 9.8m

m = 882/9.8

m = 90 Kg

Therefore, the mass of what he is carrying is 90 Kg

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Answer: The temperature decreases.

The intern energy is shown with the movement of particles, if the lower the speed then the intern energy decrease, and the temperature too.

Answer: More heat flows away from the sample

This one can be true, when they stop moving the heat (temperature) decreases and that heat energy flows away.

Both are so similar, but the most accurate is the temperature decrease because the heat flows a part away not totaly

Answer:

13,147,716,987.681

if you multiply 2 by 6573858493.8404, you get 13,147,716,987.681

Given,

Frequency of the wave, f=4 Hz

The wavelength of the wave, λ=0.5 m

The speed of a wave is given by,

On substituting the known values in the above equation,

Therefore the speed of the standing wave produced is 2 m/s

The angle θ made by the rope with the box is equal to 25.17 degrees.

If the rope is pulled at an angle A and the tension in the rope was T, then the rope will have two components of forces,

One Vertical which is TsinA and one along horizontal which is TcosA,

And we know,

W = F.s.cosα

Where,

F is the force applied,

s is the Displacement along force,

α is the angle between them,

We know, the box is moving forward, so the angle between the vertical component of tension and displacement is 90 degrees, so the vertical component of tension will not do any work, and the angle between displacement and the horizontal component is 0 degrees,

So, the work done by the horizontal component is 0 degrees,

So, we cam write,

W = TcosA.D

where D is the displacement of the box, which is given to be 23m,

T is the tension in the string which is 120N,

W is the work done by the rope on the box which is 25000J,

so, putting all the values,

2500 = 120.cosA.23

cosA = 2500/120x23

cos A = 0.9

So, A is 25.17 degrees.

The angle made by the rope is 25.17 degrees,

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According to the given statement The new acceleration is 21 m/s².

The correct option is D.

Any process where the velocity varies is referred to as acceleration. There are only two ways to speed up: changing your speed or changing your direction, or changing both. This happens because velocity entails both a speed and a direction.

The initial force is F = mass x acceleration

F = 3.17515 kg x 7 m/s²

F = 22.23 N

When the net force is tripled, the new acceleration will be

3 x F =m x a'

3 x 22.23 = 3.17515 x a'

a' = 21.003 m/s²

The new acceleration is 21 m/s². The correct option is d.

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The complete question is -

A 7 lb bowling ball accelerates at a rate of 7 m/s². If the net force on the bowling ball is tripled, what will be its new acceleration?

a. 2.3 m/s²

b. 7 m/s²

c. 14 m/s²

d. 21 m/s²

magnification and resolution compare between electron and light microscopes by they produce an photograph of a specimen with the aid of using the usage of a beam of electrons instead of a beam of mild.

Electron microscopes range from mild microscopes in that they produce an photograph of a specimen with the aid of using the usage of a beam of electrons instead of a beam of mild. Electrons have a whole lot a shorter wavelength than seen mild, and this lets in electron microscopes to supply higher-decision photos than popular mild microscopes. Electron microscopes may be used to observe now no longer simply complete cells, however additionally the subcellular systems and cubicles inside them.

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Answer:

Explanation:

We would consider the kilowatt hour for both bulbs. It is the energy consumed by an appliance per hour.

Recall, 1 kw = 1000w

15w = 15/1000 = 0.015 kw

60w = 60/1000 = 0.06kw

In 1 hour,

1)

The 15 W bulb would consume 0.015 kw.

For 10 hours per day, the consumption is 0.015 x 10 = 0.15kw

For a month of 30 days, the consumption is 0.15 x 30 = 4.5

Let's assume that the charge per KW is $0.2

Consumption cost per month = 0.2 x 4.5 = $0.9 per month

2)

The 60 W bulb would consume 0.06 kw.

For 10 hours per day, the consumption is 0.06 x 10 = 0.6kw

For a month of 30 days, the consumption is 0.6 x 30 = 18

Let's assume that the charge per KW is $0.2

Consumption cost per month = 0.2 x 18 = $3.6 per month

Thus, the 15W bulb would be an overall money saver as time goes on.

ANSWER:

1177600 joules

STEP-BY-STEP EXPLANATION:

Given:

m = 2300 kg

v = 32 m/s

We can calculate the kinetic energy using the following formula:

Replacing:

The kinetic energy of the truck is 1177600 joules.

Given:

The initial speed of the football is: vi = 0 m/s (as initially, the football is at rest)

The final speed of the football is: vf = 13 m/s

The time for which the football accelerates is: t = 0.24 s

The mass of the football is: m = 0.49 kg

To find:

The force exerted on the ball

Explanation:

The acceleration of the ball can be determined by using the following equation.

Substituting the values in the above equation, we get:

The force exerted by the punter on the ball can be determined by using Newton's second law of motion.

According to Newton's second law of motion,

Substituting the values in the above equation, we get:

Final answer:

The force exerted by the punter on the ball is 26.54 Newtons (N).

Answer:

C The two electromagnets will attract; opposite poles attract

Explanation:

Electromagnets behave like regular magnets - they have two poles - positive and negative

Like regular magnets, opposite poles attract, similar poles repel

Answer:

D. An employee receives a bonus at the end of the week for having the most sales that week.

Explanation:

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