Calculate the final velocity of a 12Kg object falling 20 m.

Answer: The force of gravity

Answer:

The correct answer is b.

Answer:

i think it's a or c hope it helps :)

Explanation:

u don't have to give brainliest tho it's fine save ur points :)

Answer: negatively charged particles move from one point to another

Explanation:

In electricity, negatively charged particles move from one point to another.​ The correct option is D.

Electric current is what causes electricity to exist and move. We can transmit energy using electricity so that we can carry out easy tasks.

The movement of electrons through conductors like copper wires is its most well-known manifestation. Electrical energy is commonly referred to as "electricity."

The flow of electrical power, commonly referred to as a charge, is the source of the energy type known as electricity.

Our homes, lights, and electrical devices are all powered by electricity. Resources including coal, energy, natural gas, and oil are used to generate power.

Particles that are negatively charged in electricity travel from one location to another.

Thus, the correct option is D.

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Answer:

C

Explanation:

I did this on edge an that was the answer

Answer:

I would think the first and the third answer

Answer:

i would say 3rd cause other may slightly effect

Answer:

W = 600 N

Explanation:

The mechanical advantage of any machine is the ratio of the load or weight to the effort applied. Hence, the general formula for mechanical advantage is as follows:

M.A = W/P

where,

M.A =Mechanical Advantage of Hammer = 10

W = Maximum force that could be generated = ?

P = Force created by me = 60 N

Therefore,

10 = W/60 N

W = 10*60 N

W = 600 N

Answer:

0.54m

Explanation:

Step one:

given data

length of seesaw= 3m

mass of man m1= 85kg

weight = mg

W1= 85*10= 850N

mass of daughter m2= 35kg

W2= 35*10= 350N

distance from the center= (1.5-0.2)= 1.3m

Step two:

we know that the sum of clockwise moment equals the anticlockwise moment

let the distance the must sit to balance the system be x

taking moment about the center of the system

350*1.3=850*x

455=850x

divide both sides by  850

x=455/850

x=0.54

Hence the man must sit 0.54m from the right to balance the system

Answer:

[tex]a=0.611\ m/s^2[/tex]

Explanation:

Given that,

Mass of a refrigerator, m = 90.01 kg

She is able to slide the refrigerator across the floor with 55  N of force.

We need to find the acceleration of the refrigerator.

Let it is a. Using second law of motion:

F = ma

[tex]a=\dfrac{F}{m}\\\\a=\dfrac{55\ N}{90.01\ kg}\\\\a=0.611\ m/s^2[/tex]

So, its acceleration is [tex]0.611\ m/s^2[/tex].

Answer:

4km

Explanation:

Distance=speed x time

Knowing this we know the time and speed

so it is 8 x .5= D

And 8 x .5 =4

If you have any questions let me know

Answer:

A car

Explanation:

A car can travel 100 m in 5 seconds

Hope this helps!

Answer:

C

YExplanation:

Answer:

[tex]g'=10.78\ m/s^2[/tex]

Explanation:

The time period of a simple pendulum is given by :

[tex]T=2\pi \sqrt{\dfrac{L}{g}}[/tex]

L is length of the pendulum and g is acceleration due to gravity

At the bottom of Death valley, g = 9.8 m/s²

We need to find the value of g if the period of the pendulum is decreased by 5.00%.

T'=(T-0.05T)= 0.95 T

[tex]T\propto \dfrac{1}{\sqrt{g} }\\\\\dfrac{T}{T'}=\sqrt{\dfrac{g'}{g}}\\\\\dfrac{T}{0.95T}=\sqrt{\dfrac{g'}{9.8}}\\\\\dfrac{1}{0.95}=\sqrt{\dfrac{g'}{9.8}}\\\\1.1=\dfrac{g'}{9.8}\\\\g'=10.78\ m/s^2[/tex]

So, the new value of acceleration due to gravity is [tex]10.78\ m/s^2[/tex].

Answer:

bouyant force - the upward force on an object in a fluid

boiling point - the temperature at which a liquid becomes a gas

solubility - the ability of a substance to dissolve in another

conductivity- the ability to transfer heat or electricity

density - the amount of mass in a given volume

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 45 × 15

We have the final answer as

Hope this helps you

Answer:

.

Explanation:

Answer:

the pelvice

Explanation:

Answer: time=4 hours

Explanation:

formula:

speed = [tex]\frac{distance}{time}[/tex]

time = [tex]\frac{distance}{speed}[/tex]

time= x

speed = 120km/hr

distance = 480 km

x = [tex]\frac{480 km}{120km/hr\\}[/tex]

=[tex]\frac{48km*hr}{12km}[/tex]

cut the zeros

and remove the signs

then

[tex]\frac{48}{12}[/tex] = 4

therefore, time taken to deliver the shipment by trucker is 4 hours

Answer:

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed

Explanation:

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Answer: 1.8 x 10-4 W/m^2

Explanation:

Answer:

attract each other

Explanation:

attract each other, opposite charges attract each other, similar charges repel.

Answer:

because of its mass. Momentum is directly propotional to the mass of a body

Answer:

Mass

Explanation:

A tennis ball has a mass of around 57 grams and a cricket ball has a mass of around 156 grams. It's much easier to catch a fast moving tennis ball because it is lighter than a cricket ball. Hope this helps x

Answer:

35.7m

Explanation:

Given parameters:

Mass of rock  = 25kg

Time of fall  = 2.7s

Unknown:

Height of the building = ?

Solution:

To solve this problem, we will use one of the motion equations;

     S  = ut + [tex]\frac{1}{2}[/tex] gt²

S is the height

u is the initial velocity  = 0m/s

t is the time

g is the acceleration due to gravity

      S = (0 x 2.7) +  [tex]\frac{1}{2}[/tex] x 9.8 x 2.7²  = 35.7m

Hardness, color , and luster.

But since you can pick one, I would say hardness

Complete Question

The complete question is shown on the first uploaded image

Answer:

The components of reaction at the fixed support are  

    [tex]A_{(x)} = 400 \ N[/tex] ,  [tex]A_{(y)} = -500 \ N[/tex] ,  [tex]A_{(z)} = 600 \ N[/tex] ,  [tex]M_x = 1225 \ N\cdot m[/tex] , [tex]M_y = 750 \ N\cdot m[/tex] ,  [tex]M_z = 0 \ N\cdot m[/tex]

Explanation:

Looking at  the diagram uploaded we see that there are two  forces acting along the x-axis on the fixed support    

   These force are  400 N  and  [tex]A_{(x)}[/tex] [ i.e the reactive force of  400 N  ]

Hence the sum of forces along the x axis is mathematically represented as

        [tex]A_{(x)} - 400 = 0[/tex]

=>     [tex]A_{(x)} = 400 \ N[/tex]

Looking at  the diagram uploaded we see that there are two  forces acting along the y-axis on the fixed support  

   These force are  500 N  and  [tex]A_{(y)}[/tex] [ i.e the force acting along the same direction with 500 N   ]

Hence the sum of forces along the x axis is mathematically represented as

        [tex]A_{(y)} + 500 = 0[/tex]

=>     [tex]A_{(y)} = -500 \ N[/tex]

Looking at  the diagram uploaded we see that there are two  forces acting along the z-axis on the fixed support  

       These force are  600 N  and  [tex]A_{(z)}[/tex] [ i.e the reactive force of  600 N  ]

Hence the sum of forces along the x axis is mathematically represented as

        [tex]A_{(z)} - 600 = 0[/tex]

=>     [tex]A_{(z)} = 600 \ N[/tex]

Generally taking moment about A along the x-axis we have that

    [tex]\sum M_x = M_x - 500 (0.75 + 0.5) + 600 ( 1 ) = 0[/tex]

=>   [tex]M_x = 1225 \ N\cdot m[/tex]

Generally taking moment about A along the y-axis we have that

    [tex]\sum M_y = M_y - 400 (0.75 ) + 600 ( 0.75 ) = 0[/tex]

=>   [tex]M_y = 750 \ N\cdot m[/tex]

Generally taking moment about A along the z-axis we have that

    [tex]\sum M_z = M_z = 0[/tex]

=>   [tex]M_z = 0 \ N\cdot m[/tex]

Answer:

b

Explanation:

a=v2/r

=0.89^2/2.8

=0.2828...

=0.28

The centripetal acceleration of the child sitting on a merry-go-round 2.8 m from the center will be 0.283 m/s².

Centripetal acceleration is the constant change in velocity necessary for an object to maintain a circular path. We can write the formula for centripetal acceleration as -

a[C] = v[T]²/r

where -

v[T] is tangential velocity

r is radius

Given is a child is sitting on a merry-go-round 2.8 m from the center and the tangential velocity of the ride is 0.89 m/s.

We can write -

Radius [r] = 2.8 m

Tangential velocity = v[T] = 0.89 m/s.

Using the formula for centripetal acceleration -

a[C] = v[T]²/r

a[C] = (0.89 x 0.89)/2.8

a[C] = 0.283 m/s²

Therefore, the centripetal acceleration of the child sitting on a merry-go-round 2.8 m from the center will be 0.283 m/s².

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Answer:

Explanation:

From the given information:

We can estimate the  cross-sectional area of the pipe by using the formula:

[tex]A_c = \dfrac{\pi}{4} D^2[/tex]

[tex]A_c = \dfrac{\pi}{4} (6 \times 10^{-2} \ m)^2[/tex]

[tex]A_c = 0.0028274 \ m^2[/tex]

To find the average velocity of the water flowing through the pipe by using the formula;

[tex]V = \dfrac{\mathtt{V}}{A_c}[/tex]

[tex]V = \dfrac{10 \times 10^{-3} \ m^3/s}{0.0028274}[/tex]

[tex]V = 3.537 \ m/s[/tex]

However, the Reynolds number can be determined by using the equation

[tex]Re= \dfrac{\rho \times V \times D}{\mu}[/tex]

[tex]Re= \dfrac{(999.1 \ kg/m^3) \times (3.537 \ m/s) \times (6 \times 10^{-3} \ m)}{1.138 \times 10^{-3} \ kg/m.s}[/tex]

Re = 18631.7225

From above, Re> 4000, thus, the flow will be turbulent.

By using Colebrook's equation in a turbulent flow; we have the following expression for Colebrook's equation:

[tex]\dfrac{1}{\sqrt{f}}= -2.0 \ log \bigg ( \dfrac{\epsilon/D_h}{3.7}+ \dfrac{2.51}{Re \sqrt{f}} \bigg )[/tex]

where;

[tex]f[/tex] = frictional force = ???

[tex]\epsilon[/tex] = roughness of steel= 0.002 mm

Replacing our values into the above equation, we have:

[tex]\dfrac{1}{\sqrt{f}}= -2.0 \ log \bigg ( \dfrac{ 2\times 10^{-6 \ m }/6 \times 10^{2 }\ m}{3.7}+ \dfrac{2.51}{18631.7225 \sqrt{f}} \bigg )[/tex]

By solving the above equation for f; we get

f = 0.026409

The pressure drop in flow;

[tex]\Delta P_L = f \dfrac{L}{D} \dfrac{\rho V^2}{2}[/tex]

[tex]=0.026409(\dfrac{29}{0.06})(\dfrac{999.1*3.537^2}{2})[/tex]

= 79771.50524 Pa

= 79.772 kPa

The pressure drop = 79.772 kPa

The head loss in the pipe:

[tex]h_L = \dfrac{\Delta P_L}{\rho g}[/tex]

= [tex]\dfrac{79771.50524 }{999.1 * 9.81}[/tex]

= 8.14 m

The power input

[tex]W_{pump} = V\Delta P_L[/tex]

=  10 * 10^{-3} * 79771.50524

= 797.72 W

Explanation:

For most temperature scales, the boiling point of water and the freezing point is used to calibrate it.

Three known temperature scales;

                               Kelvin scale              Celcius scale          Fahrenheit scale

Freezing point             273K                            0°C                        32°F

Melting point                373K                          100°C                     212°F