The atmospheric pressure at normal conditions is equal to 10.33 m under water. Then 1.0mm mercury equals to
mm water.

Answer:

4.38 %

Explanation:

Given that,

The experimental value of gravity is 10.24 m/s²

The general accepted value of gravity is 9.81 m/s²

We need to find the percent error of the experimental versus accepted values of gravity.

The formula used to find the percentage error is given by :

\(\%=\dfrac{|\text{original value-calculated value}|}{\text{original value}}\)

Putting all the values:

\(\%g=\dfrac{|9.81-10.24|}{9.81}\times 100\\\\\%g=4.38 \%\)

So, the percentage error is 4.38 %.

If the elevator has an acceleration of

a)2.10m/sec² up then scale reads 880.35N

b)2.10 m/sec² down then scale reads 569.64N

c)0m/sec² then scale reads 725N for 725-n organism sits on a scale on the floor of an elevator.

I will assume the man weighs 725 N and the 2 accelerations are

2.10m/sec² up and down. If the elevator is stationary, the scale would be applying an upward force of 725 N to hold the man in the equilibrium state.

a. When accelerating upwards, the scale have to apply an extra upward force. For the next bit, I will need the man's mass.

=>m=weight/g=725N/9.8m/sec² = 73.9kg

So, the extra upward force to accelerate the man upwards is given by  

=>F = ma

=>F = (73.9×2.10)=155.35N

The scale reading is the measurement of the upward force the scale is providing for whoever is standing there.

When accelerating the man upwards, the total upward force is

725N+155.35N=880.35N

b) When accelerating the man downwards, the total downward force is

725 -155.35N=569.64N

c)When acceleration is zero, the total  force is 725N

Hence, the scale readings are a)880.35N, b)569.64N c)725N

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.

Answer:

300 Joules

Explanation:

Just use the Work formula:

W = F . D

W = 10 . 30

W = 300 Joules

Answer:

pollution means like some dust particles

when you say noise produces noise pollution (*I'm so done on your questions lol)

hope this helps.........

Answer:it’s c SrBr2

Explanation:

Answer above is correct

Explanation:

The resistance of the wire at 150ºC is 39.2 Ω.

Given data

          Length of the wire, l = 26 m

    Diameter of the wire, d = 0.075 mm

Resistance of the wire, R1 = 51 ΩTemperature, T1 = 20 °C

We know that the resistance of a wire depends on its resistivity, length and cross-sectional area.

And, the resistivity of the wire's material can be calculated as follows:Resistivity formula

The resistance of a wire can be calculated by using the following formula:

Resistance formula Now, let's calculate the resistivity of the wire's material.

Resistivity calculation We know that the formula for resistance of a wire is given by;

Resistance formula Where l is the length of the wire, A is the cross-sectional area of the wire, ρ is the resistivity of the wire, and R is the resistance of the wire.

So, we can rewrite this equation as: Resistivity formula

Therefore, the resistivity of the wire's material is 1.58 x 10^-8 Ωm.Now, we have to calculate its resistance at 150ºC, in ohms, if the temperature coefficient of resistivity is the same as that of gold.

At 20ºC, the resistivity of gold is 2.44 x 10^-8 Ωm and its temperature coefficient of resistivity is 0.0034 K^-1.Using temperature coefficient of resistivity, we can find the resistivity of gold at 150ºC.

Resistivity of gold at 150ºCUsing the temperature coefficient of resistivity formula, we have:Temperature coefficient of resistivity formula

Substituting the given values, we get:So, the resistivity of gold at 150ºC is 2.44 x 10^-8 (1 + (0.0034 x (150 - 20))) = 2.44 x 10^-8 x 1.442 = 3.51 x 10^-8 Ωm.

Now, we can use the resistance formula to find the resistance of the wire at 150ºC.Resistance of the wire at 150ºCSubstituting the given values in the resistance formula, we get:

Therefore, the resistance of the wire at 150ºC is 39.2 Ω.

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Answer:

2m/s

Explanation:

speed = distance÷time

speed =90÷45=2m/s

The estimated demand for Week 4 is 36.3

MAD(Mean Absolute Deviation) is used to calculate the average difference between forecast values and actual values. It calculates the deviation by taking the absolute value of the difference between actual and forecasted demand. The formula to calculate Mean Absolute Deviation is:

MAD= Sum of| Actual demand - Forecast demand | / number of periods

In the given table, the Actual demand is shown as B and the forecast demand is shown as F.

B Actual Forecast 11 40 41 35 38 3 38 35 33 30

Calculation of MAD:

Actual (B) Forecast (F) |B-F|11 40 29.041 35 5.043 38 0.053 3 35.054 38 3.055 35 0.056 33 3.057 30 3.058 0.0 30.0Total 103.0

The number of periods is 9 as shown in the table.

MAD= 103/9MAD= 11.44

Mean Squared Error (MSE) measures the average squared difference between the actual and forecasted values. The formula for MSE is:

MSE= Sum of (Actual demand - Forecast demand)^2 / number of periods.

Calculation of MSE:

Actual (B) Forecast (F) (B-F)^2 11 40 841 35 25 625 38 0 0 3 35 484 38 0 0 35 33 4 30 0 900Total 2854

The number of periods is 9 as shown in the table.

MSE= 2854/9MSE= 317.1

Therefore, the calculated MAD is 11.44 and MSE is 317.1.

Trend Projection formula is given by:

Y = a + bx

where Y is the estimated demand for a particular period.

a is the Y-intercept

b is the slope of the regression line x is the period number

In the given table, the Week number is shown as X and the Actual demand is shown as Y.

Week number Actual Demand 11 24 22 29

Using trend projection for Week 3, we can calculate the demand as follows:

Slope (b) = (nΣ(xy) - Σx Σy) / (nΣ(x^2) - (Σx)^2) =(2*22 - 1*24)/(2*3 - 1*1) = 20/5 = 4

Intercept (a) = Σy/n - b(Σx/n) =(24+22)/2 - 4(2/2) = 23Y = a + bx = 23 + 4(3) = 35

Therefore, the estimated demand for Week 3 is 35.

Using trend projection for Week 4, we can calculate the demand as follows:

Slope (b) = (nΣ(xy) - Σx Σy) / (nΣ(x^2) - (Σx)^2) =(2*29 - 1*24)/(2*5 - 1*1) = 34/9 = 3.78

Intercept (a) = Σy/n - b(Σx/n) =(24+22+29)/3 - 3.78(2.0) = 21.5Y = a + bx = 21.5 + 3.78(4) = 36.3

Therefore, the estimated demand for Week 4 is 36.3.

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Answer:

Q1: I'm going to say the fence is a polarizing filter.

Q2: On the second question: (b). BTW, It's not a very well-phrased question (and I'm a particle physicist, so...)

Explanation:

Q1:

So... hard to say for sure the intent here without knowing what you've been learning in class, but a frisbee - being a flat disk - will only go through the fence if it is oriented as shown, much like polarized light will only go through a polarizing filter if the EM waves are polarized in the direction that they will pass through a polarizing filter.

Q2:

It's not a) because ALL waves require a source of energy.  

b) is for sure true and is about energy transfer - mechanical waves need a medium (like water) but EM waves do not. (Early on they thought maybe there was a medium for EM waves... they called it "aether" ... but it was proven via the Michealson-Morley experiment that no the speed of light was an absolute constant - fundamental to special relatively - which meant that light did not travel in any medium!)

(c) - depends on what you mean by "vibration", but yeah... EM waves result in varying electric fields for an observer. However, nothing to do with energy transfer per se (except that those varying fields are what transfer energy to objects that experience them...)

(d) - As above, the speed of light is a constant - cannot change speed ever *in a vacuum*.  However, the speed of light is different in various materials, and can be bent (refracted) or reflected, which means the fields change direction in interacting with matter, although they do not change speed or direction "on their own" (in a vacuum).  Similarly, mechanical waves can change speed or direction when there are changes or discontinuities in the media they travel in.  So, arguably about energy transfer (the direction and speed related to the direction and rate of energy transfer) but not really different between EM and mechanical waves.

Anyway, like I said, it's not a very clear question, so YMMV with my advice here, but (b) is for sure the best single choice.

The required component form of vector v is v = (-5, 8.66).

To find vector v in component form, given that the initial point of vector v in v2 is the origin and the terminal point is in quadrant II, angle 5 6 with the positive x-axis, and |v| = 10, we need to use the following steps. Step-by-step solution: the initial point of vector v in v2 is the origin and the terminal point is in quadrant II, we can determine the values of the x and y coordinates of the terminal point of vector v in the standard position .

Let the angle between vector v and the positive x-axis be θ.Let the x-coordinate of vector v be x and the y-coordinate of vector v be y. We can relate x and y with |v| and θ as follows:

\(|v| = sqrt(x^2 + y^2)......(1)tan θ = y/x..........(2)\)

We know that the terminal point of vector v is in quadrant II, and thus, the x-coordinate is negative. So, we can say that

\(x = -sqrt(10^2 - y^2)......(3)\)

By substituting equation (3) in equation (2), we get;

\(tan θ = y / (-sqrt(10^2 - y^2))\)

Thus, we have;

\(y = -10sin(θ).....(4)x = -10cos(θ)......(5)\)

Therefore, the component form of vector v is:

v = (-10cos(θ), -10sin(θ))

On substituting the given value of θ, which is 5 6, we have;

v = (-10cos(5 6), -10sin(5 6)) Hence, the answer is v = (-10cos(5 6), -10sin(5 6)) = (-5, 8.66).

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To find the vector v in component form, we need to determine the values of its x-component (Ax) and y-component (Ay) using the given information. The vector v can be written as v = -5.315i + 8.578ĵ. The x-component (Ax) is negative and can be calculated as -10 * cos(56°) ≈ -5.315, while the y-component (Ay) is positive and can be calculated as 10 * sin(56°) ≈ 8.578.

To find the vector v in component form, we need to determine the values of its x-component (Ax) and y-component (Ay) using the given information.

Therefore, the vector v in component form is approximately v = -5.315i + 8.578ĵ.

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The wavelength and frequency of the sound in the string is greater than the wavelength and frequency of the sound in the air.

The wavelength and frequency of the sound is determined using the following formulas.

v = fλ

f = v/λ

λ = v/f

where;

f = 600/λ

λ = 600/f

f = 333/λ

λ = 333/f

Thus, the wavelength and frequency of the sound in the string is greater than the wavelength and frequency of the sound in the air.

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By applying the pascal's law, the force that needs to be applied to a 5.0 cm diameter piston is 520 N

According to Pascal’s Law in fluid mechanics pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions.

P = F/A

Where: P = pressure; F = force; A = area of contact

In this case, we are given that:

Force of vehicle (F)= 13,000 N

Area with 25 cm diameter piston (A) = 3.14x (0.125)² = 0.0490625

Thus, the pressure by vehicle = F/A

                                                  = 13,000 / 0.0490625

                                                  = 264,968.153

Area with 5 cm diameter piston (A) = 3.14 x (0.025)² = 0.0019625

According to Pascal’s Law that pressure applied to an enclosed fluid will be transmitted without a change, so we can assume that:

F/0.0019625 = 26,968.153

F = 520 N

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Answer:

100m/s

Explanation:

speed of wave=frequency × wave length

=10 × 10

=100m/s

Answer:

100 m/s

Explanation:

Formula :

Solving using the given values :

Explanation:

because 9 is more than 1.5 and the more water, the more heat

Answer:

108

Explanation:

because F=ma

which is 90 × 1.2

= 107N

The main difference between Kinetic energy and Potential energy is that kinetic energy refers to movement while potential energy refers to storage.

Kinetic energy is a type of energy in motion or energy in movement such as a turbine (mechanical energy), while Potential energy refers to the energy that is stored to be used when required (e.g. chemical bonds of foods).

Therefore, with this data, we can see that  Kinetic energy is used as movement, while Potential energy is stored to be used in the future.

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Answer:

ironing clothes, process of sweating, line drying clothes, melting a glass of ice, drying of wet towels

Explanation:

Answer:

Water is vaporized when it is boiled on the stove to cook some pasta, and much of it forms into a thick steam. Water evaporates – Water evaporates from a puddle or a pool during a hot summer’s day.

Explanation:

hope this helps♡

Given the mass of the biker is m = 75.0 kg.

The constant velocity is v = 5.00 m/s.

The momentum of the biker is calculated by the formula.

Put the given values,

Thus, the biker's momentum is p = 375 kg m/s.

Answer:

Yes, yes it would since we need light

Explanation:

Answer:

a lever that is what is used

In the peak of summer, it hasn't rained in a week, and the plants are looking rough, so watering the plants for an hour is a good idea.

However, the next day, you come back to the garden, and the plants look in worse shape than they did previously, as if none of that water made it to the plant. Plants absorb water through their roots. The root system of a plant is responsible for drawing water and nutrients from the soil. A plant's root system must be able to absorb water quickly in order for the plant to grow and thrive. When the soil around the root system is dry, the roots will stop growing and will not be able to absorb water.

It may even start to die. Watering plants during the peak of summer is important because it will help keep the soil moist and prevent the roots from drying out. However, watering a plant too much can be harmful. If a plant is overwatered, the water may not be able to penetrate the soil and reach the roots. Instead, it may just sit on top of the soil, causing the roots to rot and die. This can cause the plant to wilt and die.To summarize, if the soil around the plant is too dry, the roots may not be able to absorb the water you gave them, causing the plant to look worse than before. Conversely, overwatering can also be harmful because the water may not be able to penetrate the soil and reach the roots, causing the roots to rot and die.

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The answer to Willem's experiment are as follows;

A) The two other measurements Willem will require to calculate the specific heat capacity of copper are;

B) The block must be well insulated to ensure no heat energy is lost to the surrounding by conduction, convection and radiation and hence, all heat supplied is used to effect a change in temperature in the copper block as intended.

C) If the block is poorly insulated, energy is lost and hence, the result would be too high because more energy would be consumed in the process.

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Answer:

80%

Explanation:

Energy Input: 360 J

Energy Output: 288 J

e= 288/360 × 100

e= 80%

Alternatively,

e= W(total)/ Q (in)

e= 288/360

e=0.8×100

e=80%

Answer:

B.  10 m

Explanation:

f = v/λ = (20 m/s)λ / (5 m) = 4 Hz    original frequency

1/2(4 Hz) = 2 Hz   half the original frequency

(20 m/s) / λ = 2 Hz

λ = (20 m/s) / (2 Hz) = 10 m

The second wavelength would increase to 10 m

Answer:

1)  10 kg-m/s

2)  2 kg

3)  20 m/s

Explanation:

The momentum of an object can be calculated using the equation:

\(\large\boxed{p=mv}\)

where:

\(\hrulefill\)

For this question we need to find the momentum of a bowling ball whose mass is 4.0 kg is rolling at a rate of 2.5 m/s.

Given values:

Substitute the given values into the momentum formula and solve for p:

\(p=4.0\;\text{kg} \cdot 2.5\;\text{m/s}\)

\(p=10\;\text{kg m/s}\)

Therefore, the momentum of the bowling ball is 10 kg-m/s.

\(\hrulefill\)

For this question we need to find the mass of a skateboard rolling at a velocity of 3.0 m/s with a momentum of 6.0 kg-m/s.

Given values:

As we want to find mass, rearrange the momentum formula to isolate m:

\(\large\boxed{m=\dfrac{p}{v}}\)

Substitute the given values into the formula and solve for m:

\(m=\dfrac{6.0\; \text{kg m/s}}{3.0\; \text{m/s}}\)

\(m=2\;\text{kg}\)

Therefore, the mass of the skateboard is 2 kg.

\(\hrulefill\)

For this question we need to find the velocity of a baseball with a mass of 0.5 kg and a momentum of 10 kg-m/s.

Given values:

As we want to find velocity, rearrange the momentum formula to isolate v:

\(\large\boxed{v=\dfrac{p}{m}}\)

Substitute the given values into the formula and solve for v:

\(v=\dfrac{10\; \text{kg m/s}}{0.5\; \text{kg}}\)

\(v=20\;\text{m/s}\)

Therefore, the velocity of the baseball is 20 m/s.

The magnification is mathematically given as

M= 0.125

Question Parameters:

A spherical glass ornament is 6 cm in diameter.

If an object is placed 10.5 cm away from the ornament, where will its image form

Generally, the mirror equation for ornament  is mathematically given as\

1/q = 2 / r - 1/p

Therefore

1/q = 2 / (-3 cm) - 1/(10.5 cm)

q = -1.31 cm

Therefore, the magnification

M = -q/p

M= -(-1.31 m)/ (10.5 cm)

M= 0.125

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