How does an aerofoil create lift and why does the air above the wing flow faster than below.

Answer:

17

Explanation:

121354

Answer:

B AND D

HOPE ITS HELF FUL .........

Answer:

1.3875 Joules. 2. 0.17A 3. 35.47volts

Explanation:

1. Energy = Q × V = 5 × 775 = 3875 Joules.

Q is quantity of electricity in Columbs

V is Voltage in volts

2. From Q = I × t

Q is quantity of electricity in Columbs

T is time taken

I is current

Now we define I as the quantity of electricity in 1 sec; hence;

200= I × 20× 60 [ 20minutes converted to seconds ]

I = 200/ 20× 60.= 200/1200=0.1667

= 0.17A( to the nearest hundredth)

3.v = E/ Q ( from equation in question 1)

V = 337/9.5 = 35.47volts

Answer:

6,653.34 J

Explanation:

Kinetic energy can be found using the following formula.

[tex]KE=\frac{1}{2} mv^2[/tex]

where m is the mass in kilograms and v is the velocity in m/s.

The object is 108 kilograms and is moving at a speed of 11.1 m/s. Therefore, the mass is 108 kg and the velocity is 11.1 m/s.

m=108 kg

v=11.1 m/s

Substitute these values into the formula.

[tex]KE=\frac{1}{2}*108*11.1^2[/tex]

Evaluate the exponent first. 11.1^2 is the same as 11.1*1.11, which is equal to 123.21

[tex]KE=\frac{1}{2} *108*123.21[/tex]

Multiply 108 and 123.21

[tex]KE=\frac{1}{2}*13306.68[/tex]

Multiply 1/2 and 13306.68

[tex]KE=6653.34[/tex]

The kinetic energy of the object is 6,653.34 Joules (kg m2/s^2)

Answer:

to make calculation more easy to get

Explanation:

if you are using chart or calculate Thermodynamic problems you will not never solve this problem with out using data table for thermodynamic

Answer:

[tex]0.25\ cm^3[/tex]

Explanation:

Data provided in the question

Number of drops fell from a burret = 60

The first reading is 28 cm^3

And, the final reading is 43 cm^3

Based on the above information, the average volume of one drop is

[tex]= \frac{Final\ readings - first\ readings}{number\ of\ drops}[/tex]

[tex]= \frac{43\ cm^3 - 28\ cm^3}{60 \ drops}[/tex]

[tex]= 0.25\ cm^3[/tex]

Basically we applies the above formula by applying the three items given in the question so that the average volume of one drop could come

Answer:

0.25\ cm^30.25 cm

3

Explanation:

Data provided in the question

Number of drops fell from a burret = 60

The first reading is 28 cm^3

And, the final reading is 43 cm^3

Based on the above information, the average volume of one drop is

= \frac{Final\ readings - first\ readings}{number\ of\ drops}=

number of drops

Final readings−first readings

= \frac{43\ cm^3 - 28\ cm^3}{60 \ drops}=

60 drops

43 cm

3

−28 cm

3

= 0.25\ cm^3=0.25 cm

3

Answer:

(A) The force would be lower on the school day than the weekend.

Explanation:

In  a  school  day  the  bus  is  on  the  road  travelling  with  kids.  But  in  a  weekend  it  is  parked.  When  a  object  stays  still  that  means  the the  force  which  is  working  on  the  earth  by  the  bus  is  equal  to  the  force which  works  on  the  bus  by  the  earth. we  can  understand  it  clearly by,  Newton's second law of motion.  

This pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.  so  as  it  is  when  it  is  balanced  it  is  not  moving.

And  on  a  school  day  the  bus  is  moving  so  it  has  a  force  pulling  itself  forward .  so  it  means  that  the  force  which  the  bus  has  is  greater  than  the  gravitational  force.

Rutherford predicted that an atom has a dense core called a nucleus.

Ernest Rutherford discovered in 1911 that every atom has a nucleus in its center. Electrically charged protons and electrically neutral neutrons make up atomic nuclei. The strongest fundamental force known to science, often known as the strong force, holds these things together.

The nucleus normally comprises more than 99.9% of the atom's mass but occupies far less than.01% of its volume. The negatively charged electrons that surround a substance's nucleus determine its chemical makeup. In most cases, the number of protons in the nucleus corresponds to the number of electrons.

Some nuclei are unstable and can decay radioactively, releasing photons (gamma decay), electrons or positrons (beta decay), helium nuclei (alpha decay), or a combination of these. Eventually, these unstable nuclei reach a stable state.

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Answer:

The tennis ball experiences a larger impact force due to its smaller mass.

Explanation:

Considering that they have the same acceleration, and F = ma where F is force and m = mass, the object with the smaller mass has a greater impact force on it.

This is because since force F = ma and a = constant, the object with a larger mass (the bowling ball)has a larger impact force with which it acts on the object with the smaller mass (the tennis ball). So, the tennis ball experiences a larger impact force due to its smaller mass.

Answer: 700 kg/m³

Explanation: Check the solutions , 3 ways :-

The density of cube  will be 700 kg/m^3.

What is the density of cube.

Length of cube(l) =15 cm =0.15m

Volume of cube ([tex]V_{c}[/tex]) = l^3=(0.15 m)^3

Volume of water displaced ([tex]V_{w}[/tex]) = Volume of cube inside water

[tex]V_{w}[/tex] =0.15*0.15*0.105 m^3

we know that,

Density of water ([tex]D_{w}[/tex]) =1000 kg/m^3

from law of floatation ,

Weight of floating body= Weight of displaced liquid

[tex]V_{c}[/tex][tex]D_{c}[/tex]g = [tex]V_{w}[/tex][tex]D_{w}[/tex]g

[tex]V_{c}[/tex][tex]D_{c}[/tex]=[tex]V_{w}[/tex][tex]D_{w}[/tex]

0.15*0.15*0.15*[tex]D_{c}[/tex]=0.15*0.15*0.105*1000

[tex]D_{c}[/tex]=0.105*1000/0.15

[tex]D_{c}[/tex] =700

Hence, The density of cube  will be 700 kg/m^3.

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Answer:

At the top of the hill.

Explanation:

As the roller coaster goes up the hill, kinetic energy (K.E) decreases, gravitational potential energy (G.P.E) increases .

As it reach the top of the hill, K.E becomes zero and G.P.E reaches maximum .

As it goes down the hill, K.E starts to increase and G.P.E decrease .

At the bottom of the hill, K.E reaches maximum and G.P.E becomes zero .

(Correct me it I am wrong)

At the top of the hill.

The following information should be considered:

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Answer:

4500

Explanation:

hey there!

first we convert the khz to hz=30000hz

we use the formula 2d=distance×time

2d=1500×6

d=9000/2=4500

i think this is the right answer....

hope this helps u :)

Answer:

Mass, m = 0.49 kg

Explanation:

It is given that,

A block of ice is sliding down a ramp of slope 45° to the horizontal. At the bottom of the ramp, the block strikes a wall with a force of 3.4 N.

We need to find the mass of the ice.

On a sloping surface, the force with which it strikes is given by :

[tex]F=mg\cos\theta\\\\m=\dfrac{F}{g\cos\theta}\\\\m=\dfrac{3.4}{9.8\times \cos(45)}\\\\m=0.49\ kg[/tex]

So, the mass of the ice block is 0.49 kg.

Answer:

-7.14

Explanation:

According to equation of motion

v = u + at

where

v is the final velocity at any time t

u is the initial velocity

a is the acceleration

and t is the time

___________________________________________

Given

An object is thrown upward it means

its initial velocity is in upward direction

but acceleration due to gravity is in downward direction which will cause to decrease the velocity of object.

Intial velocity u = 31.1 m/s

final velocity v at 4 second we have to find.

t = 4 second

a = g = 9.81 m/s2 (it is acting in opposite direction of motion hence its sign will be negative ).

Thus

a = -  9.81 m/s2

using the above values in v = u + at

v = 32.1 - 9.81*4

v = 32.1 - 39.24

v = -7.14

Thus, correct option is -7.14.

hope that helps

Explanation:  Diffusion requires energy only to move material in through the cell membrane. Diffusion does not require energy in any situation. Diffusion requires energy only to move material out through the cell membrane.

Answer:

The answer is B >:3

Explanation:

A. Atoms are composed of protons, neutrons, and electrons.

In the first section of his thesis, he claims that all matter is composed of indivisible atoms. The second part of the theory states that every atom in a certain element has the same mass and properties. Compounds, according to the third section, are combinations of two or more different kinds of atoms. Thus, option A is correct.

Atoms are the incredibly minuscule building blocks of all stuff. A given element's atoms are all the same size, mass, and other characteristics. Distinct elements' atoms have different mass, size, and other characteristics. Atoms can never be divided, produced, or eliminated.

Atoms are indivisible units that cannot be created or destroyed during a chemical process. Each atom of a certain element has the same mass and chemical properties. Atoms of various elements have weights and chemical properties that differ.

Therefore, Compounds are created when atoms combine in ratios of small whole numbers.

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Answer:

[tex] \boxed{Average \: speed = 40 km/h} [/tex]

Explanation:

Distance travelled = 20 km

Time taken = 30 min

= [tex] \frac{30}{60} [/tex] h

= [tex] \frac{1}{2} [/tex] h

[tex]Average \: speed = \frac{Distance \: travelled}{Time \: taken} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{20}{ \frac{1}{2} } \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 20 \div \frac{1}{2} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 20 \times 2 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 40km/h[/tex]

Answer:

According to me, I think this is the answer

Explanation:

initial position= -22 meters.

this indicates that object is in the negative direction as a negative sign is used to represent the location.

displacement is indicated as -10.4 meters. this is also in the negative direction.

initial + displacement= final

= -22 + (-10.4)

= -32.4 meters

this would be the final position, away from the origin.

displacement is a vector quantity; both magnitude and direction matter.

Answer:

I think it turns into heat (thermal) energy if I'm right

Answer:

The energy is not destroyed, the energy has been transformed into another kind of energy, in this case to heat with energy of 0,002 J

Explanation:

One of the fundamental principles of physics states that energy is neither created nor destroyed, it is only transformed.

In this case, when the ball with an energy of 1 J bounces on the ground, it loses an energy equivalent to 1-0.998 J = 0.002 J. This energy of 0.002 J is not destroyed in the process, but is transformed into another type of Energy. In this case, said energy has been converted to heat. A heat equivalent to 0.002 J of energy.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Translation to spanish

Uno de los principios fundamentales de la física afirma que la enegía no se crea ni se destruye, sólo se transforma.

En este caso, cuando la pelota con una energía de 1 J rebota en el suelo pierde una energía equivalente a 1-0,998 J = 0,002 J. Esta energía de 0,002 J no se destruye en el proceso, sino que se transforma en otro tipo de energía. En este caso dicha energía se ha convertido en calor. Un calor equivalente a 0,002 J de energía.

Answer:

The correct answer to the following question will be Option A (High specific heat).

Explanation:

A thermal or heat insulator has been used to help avoid heat from travelling from one location to the another.

Other given choices are not related to the given scenario. So that Option A seems to be the right answer.

Answer:

velocity = 1527.52 ft/s

Acceleration = 80.13 ft/s²

Explanation:

We are given;

Radius of rotation; r = 32,700 ft

Radial acceleration; a_r = r¨ = 85 ft/s²

Angular velocity; ω = θ˙˙ = 0.019 rad/s

Also, angle θ reaches 66°

So, velocity of the rocket for the given position will be;

v = rθ˙˙/cos θ

so, v = 32700 × 0.019/ cos 66

v = 1527.52 ft/s

Acceleration is given by the formula ;

a = a_r/sinθ

For the given position,

a_r = r¨ - r(θ˙˙)²

Thus,

a = (r¨ - r(θ˙˙)²)/sinθ

Plugging in the relevant values, we obtain;

a = (85 - 32700(0.019)²)/sin66

a = (85 - 11.8047)/0.9135

a = 80.13 ft/s²

The magnitude of the linear velocity of the rocket at the given position is 1,667.2 ft/s.

The magnitude of the acceleration of the rocket at the given position is 90.73 ft/s².

The given parameters;

The linear velocity and final angular velocity of the rocket is calculated as follows;

[tex]a_c = \frac{v^2}{r} \\\\v^2 = a_c \times r\\\\v = \sqrt{a_c r} \\\\v = \sqrt{85 \times 32700}\\\\v = 1667.2 \ ft/s\\\\\omega_f = \frac{v}{r} = \frac{1667.2}{32700} = 0.051 \ rad/s[/tex]

The radial acceleration of the rocket is calculated as follows;

[tex]\omega_f^2 = \omega_i^2 + 2\alpha _r \theta\\\\(0.051)^2 = (0.019)^2 + 2(66^0 \times \frac{2\pi \ rad}{360 ^0} )(\alpha _r)\\\\(0.051)^2 - (0.019)^2 = 2(66^0 \times \frac{2\pi \ rad}{360 ^0} )(\alpha _r) \\\\0.00224 = 2.304\alpha _r\\\\\alpha _r = \frac{0.00224 }{ 2.304} \\\\\alpha _r = 0.00097 \ rad/s^2[/tex]

The tangential acceleration is calculated as follows;

[tex]a_t = \alpha_r \times r\\\\a_t = 0.00097 \times 32700\\\\a_t = 31.72 \ ft/s^2[/tex]

The resultant acceleration of the rocket is calculated as follows;

[tex]a = \sqrt{a_t^2 + a_c^2} \\\\a = \sqrt{31.72^2 \ + \ 85^2} \\\\a= 90.73 \ ft/s^2[/tex]

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Answer:

Explanation:

Rubbing Alcohol

Nail polish and nail polish remover

Linseed oil

Aerosol cans

Non-dairy creamer

Gasoline, turpentine, and paint thinner

Hand sanitizer

Flour

Oranges

Answer:

9 km/h

Explanation:

Speed can be found using the following formula.

s=d/t

where d is distance and t is time.

The car traveled 45 kilometers in 5 hours.

d=45 km

t=5 h

Substitute these values into the formula

s=45 km/5 h

Divide 45 by 5

s=9 km/h

The average speed of the car is 9 kilometers per hour.

Answer:

16.875 m [East]

Explanation:

In a velocity time displacement problems

displacement is given by

displacement of moving body = velocity of the that body  * time

displacement will be in the direction of velocity of body.

Given

velocity = 7.5 m/s [East]

time = 2.25 seconds

displacement = 7.5 m/s [East] *2.25 seconds

displacement = 16.875 m [East]

Thus, displacement of jack is 16.875 m [East].

SNEAKERS and tires are grooved so that there is some kind of interlock with it and the surface . This interlocking creates more friction and this friction enable the object to have some grip on the surface . If the sneakers or tires werent grooved,then with sneakers we might slip and fall and with tyres the car would skid  

Answer:

C

Explanation:

I just took the quiz

Answer:

The correct option is;

A. Circular

Explanation:

Some of the light that impinges on the surface are reflected and the rest are transmitted to a different medium

At the surface of the next medium also, some of the light are transmitted while the others are reflected and refracted through the first medium

The speed of light (and hence the wavelength and color) refracted through the thin film is changed as the distance the refracted light travels through the thin film is increased as we move away from the point directly in the front view to some distance as the reflected light path from those distance to the eye is increased due to their inclination giving them a different wavelength which are all equal at a radial distance from the eye hence forming a circular fringes.

Answer:

f = 15 N

Explanation:

It is given that, when you push with a horizontal 15-N force on a book that slides at constant  velocity, a frictional force also acts on it. Frictional force is an opposing force. The magnitude of applied force and frictional forces are same. So, the force of friction on the book is equal to 15 N.