Calculate the force of kinetic friction on a 12.3 kg mass if its coefficient of kinetic friction is 0.137

Answer:

Full and New Moon

Explanation:

Answer:

your voice travels much more quickly across your vocal cords, also LOT less density which causes the sound to  travel over twice as fast through helium than it does regular air.

ballon Air = Helium

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Answer:

The answers as per the given problem is solved in the segment below.

Explanation:

According to the question,

(a)

[tex]F=ILB[/tex]

By putting the values, we get

   [tex]=10(2\times 10^4)(5\times 10^{-5})[/tex]

   [tex]=10 \ N[/tex]

(b)

[tex]W=Fx[/tex]

or,

    [tex]=Fvt[/tex]

    [tex]=10(7.80\times 10^3)(3600)[/tex]

    [tex]=2.81\times 10^8 \ J[/tex]

(c)

[tex]\frac{1}{2}mv'^2 =\frac{1}{2}mv^2-\omega[/tex]

or,

      [tex]v=[v^2-\frac{2 \omega}{m} ]^\frac{1}{2}[/tex]

         [tex]=[(7.8\times 10^3)^2-\frac{2(2.81\times 10^8)}{1\times 10^5} ]^{\frac{1}{2} }[/tex]

         [tex]=7.79\times 10^3 \ m/s[/tex]

now,

[tex]\Delta v=v-v'[/tex]

     [tex]=0.36 \ m/s[/tex]

(d)

Answer:

1) - 35

2) - 35

3) - 67

4) - 83

Answer:

800mph

Explanation:

Answer:

100 kg

Explanation:

F = 400 N

a = 4 m/s

F = ma

400 = m(4)

m = 100 kg

Answer:

Explanation:

use formula,

Force=mass*acceleration

400 N=mass*4m/s

400 N/4 m/s=mass

100 kg =mass

[tex]\huge \mathcal\pink{Answer}[/tex]

So, Speed of light in Rock salt is 1/1.54 times speed of light in vacuum. Therefor Speed of light in Rock salt is less [1.94 x 10⁸m/s ] compared to speed of light in vacuum =C = 3 x 10⁸ m/s.

Abiotic variables are particularly essential since they have a direct impact on organisms' ability to live.

0.23 A across the 20-ohm resistor

Explanation:

The 20-ohm and 35-ohm resistors are in parallel so their combined resistance is

(1/20) + (1/35) = 0.0786 ohm^-1 or 12.73 ohms

These two are in turn connected in series with the 15-ohm resistor so the total resistance of the circuit is

R = 12.73 ohm + 15 ohm

= 27.73 ohm

Hence, the total current drawn by the circuit is

I = V/R = (10 V)/(27.73 ohm)

= 0.36 A

The potential across the 15-ohm resistor is

V1 = IR = (0.36 A)(15 ohm)

= 5.4 V

Now the potential across the 20-ohm and 35-ohm resistors is

V2 = V - V1 = 10V - 5.4V

= 4.6 V

This means that the current across the 20-ohm resistor is

I = V/R = (4.6 V)/(20 ohm)

= 0.23 A

Answer:

Answer would be 0.23

Explanation:

Put in 0.23

Answer:

The velocity of the ball after 5 seconds will be 49 m/s

Explanation:

v = final velocity

u = initial velocity

g = acceleration due to gravity

t = time

Initial velocity of the ball = 0 (As the ball is dropped from rest )

Acceleration due to gravity = 9.8 m/s

Time taken = 5 sec

As the acceleration due to gravity is constant in both the cases we can use the equations of motion in order to solve this question

Part I :- As we already know the values of u,g,ant t we can use the first equation of motion in order to find v

Part II :- As we know the values of u, t , g we can use the second equation of motion in order to find s.

Velocity of the ball after 5 seconds

Distance covered by the ball in 5 sec

Answer:

[tex] 0.625 \: g {cm}^{ - 3} [/tex]

Explanation:

[tex]density \: = \frac{mass}{volume} \\ \\ = \frac{250}{400} \\ \\ = 0.625 \: g {cm}^{ - 3} [/tex]

Answer:

anashe

Explanation:

full

Answer:

w=fxd

w=3.5x4

w=14

this is the correct answer

Answer:

The energy was stored as chemical energy in Sue' muscle before it was transformed into mechanical energy that moves the pump handle to ump the tyre

Explanation:

In pumping up the tyre, the valve of manual pump is attached airtight to the tyre tube

As the handle of the pump is pulled up or out, air rushes into the pump from the atmosphere through the inlet valve

As the handle pushed in, the inlet valve closes and the air is forced into the tyre tube by difference in pressure and as the tube is filled, more pressure is required to enable the tube expand and build pressure inside to maintain a circular cross section while carrying load

According to Gay Lussac's Law, temperature of the air in the pump increases as its pressure increases

Given that Sue provides the energy for pumping the tyre, the energy was stored as chemical energy in Sue's muscles which is then used in moving the pump handle in the up and down motion required to pump the tyre

Answer:

245 J

Explanation:

1) 35^2 = 1225

2) 1225 * 0.4 = 490

3) 490 ÷ 2 = 245

When a car traveled on a flat road, keeping its kinetic energy increased over time, while its potential energy remained constant. The correct option is A.

Mechanical energy is the sum of kinetic energy and potential energy.

As the car's kinetic energy is increasing, but there is no change in potential energy, then mechanical energy will increase.

Therefore, the car’s mechanical energy increased because the sum of the car’s kinetic and potential energy increased over time. The correct option is A.

Learn more about mechanical energy.

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Answer

gas, dust, and billions of stars and their solar systems, all held together by gravity.

Explanation:

Answer:

Galaxies are a group of stars held together by gravity.

Precaution: balance the ruler being used first.

Precaution: balance the ruler being used first.Use distances from the pivot of greater than 25 cm (250 mm).

Precaution: balance the ruler being used first.Use distances from the pivot of greater than 25 cm (250 mm).Weigh the unknown and known masses in your hands before using the ruler, and place the lighter mass as far from the pivot as possible.

Precaution: balance the ruler being used first.Use distances from the pivot of greater than 25 cm (250 mm).Weigh the unknown and known masses in your hands before using the ruler, and place the lighter mass as far from the pivot as possible.Measure distances from the pivot to the centre of mass of the object.

Answer:

The correct answer is - do nothing.

Explanation:

If two same or identical objects, in this instance two glass rods, were rubbed together they neither attract nor repel each other as there is no transfer of electrons from one material to the other material as there is no difference in their charges.

Only two different objects are able to transfer electrons from one material to the other material if rubbed together, to produce the conditions for static electricity to be observed. Therefore there would be no charge on the glass rod so there would be no charge to balls to repel or attract.

Answer:

liquid phase

Explanation:

it is liquid phase because molecules are not that tightly packed as solid and not that far away from each other as in gas phase.

Answer:

[tex]I_2=0.8586A[/tex]

Explanation:

From the question we are told that:

Turns Ratio i.e[tex]\frac{N_2}{N_1}=\frac{1}{106} (step down)[/tex]

Voltage [tex]v=170v[/tex]

Primary current amplitude[tex]I_1= 8.10 mA =>8.10*10^{-3}A[/tex]

Generally the equation for a Transformer is mathematically given by

[tex]\frac{E_1}{E_2}=\frac{I_2}{I_1}=\frac{N_1}{N_2}[/tex]

Therefore

[tex]I_2=\frac{N_1}{N_2}*I_1[/tex]

[tex]I_2=106*8.10*10^{-3}[/tex]

[tex]I_2=0.8586A[/tex]

Answer:

[tex]a=0.276[/tex]

Explanation:

From the question we are told that:

Mass [tex]m=98.kg[/tex]

Radius [tex]r=0.335[/tex]

Angular velocity [tex]\omega=100rpm[/tex]

Radial force of [tex]F_r=23.6 N.[/tex]

Kinetic coefficient of friction  [tex]\mu=0.192[/tex]

Generally the equation for Kinetic Force is mathematically given by

 [tex]F_k=\mu.F_r[/tex]

 [tex]F_k=0.192*23.6[/tex]

 [tex]F_k=4.5312[/tex]

Generally the equation for Torque on Center is mathematically given by

 [tex]Ia=f_k*r[/tex]

Where

 [tex]I=\frac{Mr^2}{2}[/tex]

Therefore

 [tex]a=\frac{2f_k}{Mr}[/tex]

 [tex]a=\frac{2*4.5312}{98*0.335}[/tex]

 [tex]a=0.276[/tex]

Therefore Angular acceleration of the grindstone is

[tex]a=0.276[/tex]

Answer:

d. wavelength/2.

Explanation:

The circular motion of water molecules extends from regions of shallow water to deep water. It ranges from a depth, H < L/20 for shallow water to a depth of H > L/2 for deep water where L is the wavelength of the wave.

For depths greater than L/2,the circular motion is not affected by the wave energy. So, the maximum depth for the circular motion is L/2 = wavelength/2.

Answer: 7.2%

Explanation:

Given

Efficiency of converting energy produced by wind into electricity is about [tex]\eta_1=40\%[/tex]

Transport of electricity efficiency [tex]\eta_2=90\%[/tex]

Fluorescent light bulb efficiency is [tex]\eta_3=20\%[/tex]

Overall efficiency is the product of all the efficiencies i.e.

[tex]\Rightarrow \eta=\eta_1\times \eta_2\times \eta_3\\\\\Rightarrow \eta=0.4\times 0.9\times 0.2\\\Rightarrow \eta=0.072\ \text{or}\ 7.2\%[/tex]

Therefore, the overall efficiency is 7.2%

Answer:

The mass density (ρ)

Explanation:

The molar volume (Vm) is the volume that a mole of an element or compound occupies at standard temperature and pressure STP

The molar volume can be found as follows;

[tex]Vm = \dfrac{Mm}{\rho}[/tex]

Where;

Mm = The molar mass

ρ = The mass density

The molar mass (Mm) of an element or a compound is the ratio of the mass of the element or compound to the amount of the element or compound in the given mass

The mass density, ρ, of an element or a compound is the mass of a unit volume of the element or compound

Therefore, we have;

[tex]\rho = \dfrac{Mm}{Vm}[/tex]

When we divide the molar mass (Mm) by the by the molar volume (Vm), we obtain the mass density (ρ).

Answer:

Electric force is caused by electric charge. Electric charge is a property of the bits of matter within atoms. Electric force can cause matter to attract or repel because there are two kinds of charge &#8211; positive and negative charge.

The effects of electric force can be summarized as the law of electric charge: Pieces of matter with the same kind of charge repel each other. Pieces of matter with the same kind of charge attract each other. 2 objects with a positive charge repel each other, as do 2 objects with a negative charge.

Most objects are made of matter with equal amounts of positive and negative charge. Objects with the same # of positive and negative charges are electrically balanced, or neutral. Electric force is observed only when the balance of charge on objects is disturbed.

An electric charge on an object that causes the object to attract or repel other objects is called static electricity. The adjective static describes something that does not move. Charges on an object are called static electricity to contrast then with the moving charges in an electric current.

Answer:

(a) 1320 W

(b) 480 W

(c) E':E ≈ 11:2

Explanation:

(a) Applying,

P' = VI'................. Equation 1

Where P' = Power of the blow-dryer, V = Voltage, I = current rating of the blow-dryer.

From the question,

Given: V = 120 V, I' = 11 A

Substitute these values into equation 1

P = (120×11)

P = 1320 W

(b) Similarly,

P = VI................... Equation 2

Where P = Power of the vacuum cleaner. I = current rating of the vacuum cleaner.

Also Given: I = 4 A,

Therefore

P = 4(120)

P = 480 W

(c)

E' = P'/t'............. Equation 3

E = P/t................ Equation 4

Where E' = Energy of the blow-dryer, t' = time of use of the blow-dryer, E = Energy of the vacuum cleaner, t = time of use of the vacuum cleaner

From the question,

Given: t' = 15 minutes = (15×60) = 900 seconds, t = 30 minutes = (30×60) = 1800 seconds

Substitute these values into equation 3 and 4

E' = 1320/900

E' = 1.47 J,

E = 480/1800

E = 0.267

Therefore,

E':E = 1.47:0.267

E':E ≈ 11:2

In short :

An object is said to be at rest when it doesn't change is position with respect to a stationary object which is taken as its reference point or origin of the object, as the time passes.

Answer:

Answer:

The velocity of the ball when it reaches its highest point is  0

Explanation:

The velocity of the ball when it reaches its highest point is 0

Once the ball is tossed into the air, as it goes up, the initial velocity with which it was thrown, reduces, as the motion of the ball is hindered by several forces such as gravity and air resistance. This slows down the velocity of the ball, up until it reaches a point, where the upwards velocity of the ball becomes zero. at this point, the ball begins to fall back to the ground.