Determine the value of x. A 9.75 B 11 C 22 D 19.5

As per the given question;

On a dry day, a mirror or window polished with a dry cloth quickly develops dust. Dry cloth friction on glass produces charged static electricity, which attracts microscopic non-charged dust particles.

Static electricity can cause problems or even pose a risk. Your hair standing on end energy can also destroy electronics and cause explosions. However, it can also be a huge asset to modern life when properly managed and manipulated.

When the positive and negative charges are out of balance, static electricity is produced. While electrons like to jump all over the place, protons and neutrons don't move around that much. A negative charge is present when an object (or person) has extra electrons.

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Explanation:

Q=mc(T2-T1)

or

q = mcΔT ,

where m is the mass of the sample,

c is the specific heat,

and ΔT is the temperature change.

Q=2.0 × 2000 × 5

Q=20000J⋅kg −1 ⋅K −1

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gear C and Z will run at the same RPM

RPM is not a unit, according to the International System of Units (SI). The word "revolution" is a semantic annotation rather than a unit, which explains this. RPM formula sign must be f for (rotational) frequency and or for angular velocity due to the measured physical quantity. s−1  or Hz is the basic SI-derived unit that corresponds. The radians per the second unit are used to express angular speed.

As a result, a disc rotating at 60 RPM  is considered to be rotating at either 2 rad/s or 1 Hz, where the former refers to angular velocity and the latter to the rate of revolutions per second.

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This person walks a distance of ____31____ km.

This person has a displacement of ____3____km.

Since we can see in the figure, it is also stated in the question that each square has a 1km boundary. A bold line runs across 31 edges from A to B.

As a result, the total distance traveled from A to B is 31 kilometers.

Because displacement is the distance between the original and final positions. The displacement in the diagram is 3km. As there is a three-block discrepancy between the beginning and end positions.

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Answer:

m is expressed in kilograms and r in metres, with I (moment of inertia) having the dimension kilogram-metre square.

The mass is moving with an acceleration of 13.299 m/s².

The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. They are vector quantities, accelerations.

According to therefore mentioned statement,

the direction of the net force applied on an object determines its acceleration;

according to mentioned data;

F₁=30N

F₂=10N

Net force on object;

F=F₁+F₂

F=F₁y+F₂Cos30°(-x)+F₂ Sinx(-y)

F=3y+10×(√3/2)(-x)+10×(1/2)(-y)

F=ma

ma=-5√3/2(x)+25y

2a=-5√3x/2+25y

a=-5√3x+25y

magnitude(a)=√(-5√3/2)²+(25/2)²

     (a) =13.299m/s²

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The block's oscillation frequency is 1.1 Hz.

The block's distance from equilibrium when the speed is 57 cm/s  is 14.2 cm.

The block's distance from equilibrium at t = 7.0 s  is 10.37 cm.

The oscillation frequency of the block is calculated as follows;

f = 1/2π√(k/m)

f = 1/2π √(9/0.19)

f = 1.1 Hz

ω = 2πf

ω = 2π x 1.1

ω = 6.91 rad/s

x(t) = A cos(ωt + Φ)

ωX sin(Ф) = v

6.91 x 29 sin(Ф) = 116

sin(Ф) = 116/200.39

sin(Ф) = 0.579

Ф = arc sin(0.579)

Ф = 0.62 rad

29 = A cos(6.91 x 0  +  0.62)

29 = A cos(0.62)

29 = A(0.814)

A = 35.63 cm

when the speed is 57 cm/s, the distance of the block is calculated as follows;

ωX sin(Ф) = v

(6.91)X sin(0.62) = 57

X(4.015) = 57

X = 57/4.015

X = 14.2 cm

x(t) = A cos(ωt + Φ)

x(7) = 35.63 cos(6.91 x 7   +  0.62)

x(7) = 10.37 cm

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Answer:

See below

Explanation:

In absolute temperature   80 F = 299.82 K

   1/2 of this is 149.9 K   = - 189.84 degrees F

- 189.84° F is the temperature of an object where it is half as hot as 80°F. A thermometer or even a calorimeter can be used to measure it.

The temperature of a thing is an absolute measure as to how warm or cold it is. A thermometer or even a calorimeter can be used to measure it. It is a method for determining actual internal energy of a particular system.

Temperature is an aspect of reality which we have a reasonably intuitive grasp on since humans easily detect the quantity of heat and cold inside an area. Although the two notions are related, temperature is distinct from heat. Temperature is a measurement of a system's intrinsic energy.

In absolute temperature  

80 F = 299.82 K

1/2 of this is 149.9 K   = - 189.84° F

Therefore, - 189.84° F is the temperature of an object where it is half as hot as 80°F.

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John's resultant displacement from the 252km marker when traveling along a straight interstate highway is 75 km

Δx = [tex]x_{2}[/tex] - [tex]x_{1}[/tex]

Δx = Displacement

[tex]x_{2}[/tex] = Final position

[tex]x_{1}[/tex] = Initial position

[tex]x_{2}[/tex] = 177 km

[tex]x_{1}[/tex] = 252 km

Δx = 177 - 252

Δx = - 75 km

Displacement is the shortest distance between initial and final positions. It is denoted using Δx. Since, it is a measure of length, its unit is usually meter.

Therefore, John's resultant displacement from the 252km marker when traveling along a straight interstate highway is -75 km

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Considering the definition of speed, the average speed is 431.94 m/s.

Speed ​​is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it.

In other words, the speed is associated with the change of position of an object in space within a certain amount of time.

The speed can be calculated using the expression:

speed= distance traveled÷ time

In this case, you know that:

Replacing in the definition of speed you can calculate the time it takes to fly away and back:

Solving:

Then, the total distance traveled and the total time will be the sum of each of the sections traveled:

Replacing in the definition of speed:

speed= 1,156,000 m÷ 2,676.32 s

Solving:

speed= 431.94 m/s

Finally, the average speed is 431.94 m/s.

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The graph C best describes the cliff jumper's vertical displacement as shown in the attachment.

The initial vertical velocity of the cliff jumper would be zero as the cliff jumper runs off the cliff horizontally. As he jumps off, he is subjected to gravitational pull. This increases his velocity with respect to time.

During some of the initial time, the displacement would be lesser as his velocity increases with increase in time. Also the graph is in the 4th quadrant because the vertical displacement is downwards ( Negative ) as the time increases ( Positive ).

Therefore, the graph with a curve that lies in 4th quadrant with a lesser initial displacement is the correct answer.

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The entire motion of an object, regardless of direction.

In physics, motion is that the phenomenon in which an object changes its position with respect to time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and frame of regard to an observer and measuring the change in position of the body relative to that frame with change in time. The branch of physics describing the motion of objects without regard to their cause is called kinematics, while the branch studying forces and their effect on motion are named dynamics.

If an object isn't changing relative to a given frame of reference,  the thing is said to be at rest, motionless, immobile, stationary, or to possess a constant or time-invariant position with reference to its surroundings. Modern physics holds that, as  there's no absolute frame of reference, Newton's concept of absolute motion can't be  determined

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The ship's velocity after a half minute (in m/s) is 170 m/s

This is defined as the rate of change of velocity which time. It is expressed as

a = (v – u) / t

Where

The final velocity can be obtained as illustrated below:

5 = (v – 20) / 30

Cross multiply

v – 20 = 5 × 30

v – 20 = 150

Collect like terms

v = 150 + 20

v = 170 m/s

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The time taken for the train to stop is 8.9 seconds.

The distance traveled by the train during acceleration is 9,984 m.

The distance traveled by the train during deceleration is 17.8 m.

Use the following kinematic equation to determine the time taken for the train to stop.

v = u + at

where;

0 = 4 - 0.45t

0.45t = 4

t = 4/0.45

t = 8.89 seconds = 8.9 seconds

s = ut + ¹/₂at²

where;

s = (4)(480) +  ¹/₂(0.07)(480)²

s = 9,984 m

s = ut + ¹/₂at²

s = (4 x 8.9) + ¹/₂(-0.45)(8.9)²

s = (4 x 8.9) - ¹/₂(0.45)(8.9)²

s = 17.8 m

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Answer:

See below

Explanation:

Distance covered = 400 + 200 = 600 km

displacement =   400 w   -  200 e  = 200 km  west

The train is not an inertial frame of reference, and the train may be moving at a constant speed in a straight line or the train may be instantaneously at rest.

The pace at which an object's position changes about relation to a frame of reference and time is known as its velocity.

Uniform velocity is the state in which a body travels the same distance in the same amount of time. When the amplitude and direction of a body's average velocity (v) over time (t) do not change over time, the body is said to be moving at a uniform velocity. An illustration of uniform motion is the moon's orbit around the earth.

As the rate of change of velocity, acceleration is an illustration of a vector quantity.

When an item is moving in a straight path with an increase in velocity occurring at regular intervals of time, it is said to be experiencing uniform acceleration. The uniform acceleration of an object during free fall is one example.

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Answer:

An electric field has a magnitude of 400 N/C and makes an angle

60

o

with the perpendicular to the surface of a flat surface of dimensions 30 cm by 20 cm. Calculate the electric flux through the surface.

Explanation:

Answer:

section 2

Explanation:

section 2 contains Alkali, Alkaline, Transition, and Post-transition metals

Answer:

In a freezer, the air molecules absorb energy from the water, causing the water molecules to freeze into a solid.

Answer: Water expands when it freezes. As freezing continues, the expanding ice under the surface forces the remaining water up through the hole and it freezes around the edge forming a hollow spike

Explanation:

Water expands when it freezes. As freezing continues, the expanding ice under the surface forces the remaining water up through the hole and it freezes around the edge forming a hollow spike. Eventually, the whole thing freezes and the spike is left.

After the given information and solving it the cumulative distance the bird travel is 6 km.

The given parameters of the motion are;

The velocity of the runner,

vr  = 2.2 km/hr

The distance from the finish line and the bird begins to fly from the runner to the finish line,

L = 4 km

The direction and speed of the runner = 6.6 km/hr in a straight line to the finish line and back to the runner

The speed of the bird = 4 × The speed of the runner

Given,

The length of the bird = 0

The bird turns without loss of speed

The time it takes the bird to reach the finish line,

t₁ = 4 km / (6.6 km/hr) = 0.606 hr

The distance the runner runs in time t₁,

d = 2.2 km/hr × 0.606 hr

d = 1.3332 km

The distance runner and  bird combined travel before they meet,

X, is given as follows;

X = L - d

X = 4 km - 1.3332 km

X = 2.667 km

We get; X = (vr + vb) x t

Which gives;

2.667 = ( 2.2 + 6.6) × t

t = 2.667/( 2.2 + 6.6 )

t =  2.667/(8.8)

t = 0.303

The time it take for the bird and the runner to meet,

t = 0.303 hour

The distance the bird travels before reaching the runner,

d₂ = vb x t

So,

d₂ = 6.6 km/hr × 0.303 hr = 2 km

The cumulative distance the bird travels dt = L + d2

dt = 4 km + 2km

dt = 6 km

The cumulative distance the bird travels by the time it reaches the runner dt = 6 km

Alternatively, we have;

db = d₁ + d₃

dr = d₂

d₁ + d₃ + d₂ = 2·L

So, dr + db = 2·L

dr = The distance runner runs before meeting with the bird

db = The distance bird travels before meeting with the runner

db = 4dr

So,

dr +  db = 3 × 4 = 12

dr + 4· dr = 4 · dr = 12

dr = 12 /4 = 3

db =3 × dr

db = 3 × 2

db = 6 km

The distance bird travels before meeting with the runner,

db = 6 km

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The question can be solved using the principle of Newton's second law of Motion. Newton's second law of motion  is often stated as F=ma, which means the force acting on an object is equal to the mass (m) of an object times its acceleration.

F=ma

According to the given data,

Force of 20N is applied to the object

acceleration of 5 m/s^2 is obtained on the object

From Newton's second law of motion,

F=ma

20N =m x 5

m=4kg

To obtain an acceleration of 1 m/s^2, the force required will be

F= ma

F= 4 X 1 = 4 N

To obtain an acceleration of 10 m/s^2, the force required will be

F=ma

F= 4 x 10

   = 40 N

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The average speed you must run is 7.97 mph.

The average speed of an object is the ratio of total distance traveled by the object to

Average speed = total distance / total time of motion

Total time of motion = total distance / average speed

total time = (18.5 + 5.5) / (14.5)

total time = 1.66 hours

t1 = 18.5 / 19.1

t1 = 0.97 hour

t2 = 1.66 hr - 0.97 hr

t2 = 0.69 hr

v = 5.5 miles /0.69 hr

v = 7.97 mph

Thus, the average speed you must run is 7.97 mph.

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Fan B has an efficiency of 55% and usefully transfers 10J of energy to its kinetic energy store each second. 18.18 J of energy is supplied to fan B per second.

Efficiency is the capacity to do a task with little or no wastage, effort, or energy. Being effective is maximizing the use of the resources at your disposal to achieve your objectives. Simply put, something is efficient if there is no waste and every process is optimized.

To calculate the input energy use the following formula

Efficiency = Energy(out) / Energy(in) * 100%

Efficiency = 55%

Energy(out) = 10J

Energy(in) = ?

On putting the given values we get,

55 = Energy(in) / 10 * 100%

On solving we get,

Energy(in) = 18.18J

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Answer:

pascal

energy,

power,

electric charge,

Explanation:

Answer:

Condensation

Explanation:

When water vapour (gas) is cooled it undergoes CONDENSATION to form water(liquid).

The time taken for the car to stop is 4.5 seconds and the initial speed of the car is 76.47 ft/s.

The initial speed of the car is calculated as follows;

v² = u² + 2as

where;

0 = u² + 2as

0 = u² + 2(-17)(172)

0 = u² - 5858

u² = 5848

u = 76.47 ft/s

v = u + at

0 = 76.47 - 17t

17t = 76.47

t = 4.5 seconds

Thus, the time taken for the car to stop is 4.5 seconds and the initial speed of the car is 76.47 ft/s.

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The cost of operating it through the night is $0.96.

We know that the electrical current is obtained by the use of the formula;

P = IV

P = power

V = voltage

I = current

I = P/V

I = 1500 W/110 V

I = 13.6 A

Now;

The power in kW = 1.5 kW hence the energy used in 1 hour is 1.5 kWhr

If the cost of 1 kWhr = $0.08

Then 1.5 kWhr costs =  1.5 kWhr  * $0.08/1 kWhr

= $0.12

To operate it all through the night = 8 * $0.12  = $0.96

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Answer:

here's the answer

Explanation:

given:

h= 20.0m

M= 12.0kg

g=10m/s²

solution:

potential energy = mgh = (12.0kg)(10m/s²)(20.0m)

= 2400

potential energy = 2400J

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D. The input rating of the furnace is determined as 100,000 BTU.

Input power rating means the power, expressed in Watts or one of its multiples, for which the energy storage unit has been designed to operate at nominal conditions.

eff = (output rating / input rating) x 100%

80/100 = 80,000 BTU / input rating

0.8 = 80,000 BTU / input rating

input rating = 80,000 BTU/0.8

input rating = 100,000 BTU

Thus, the input rating of the furnace is determined as 100,000 BTU.

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