david's home uses a whopping 100 watts of phantom power (e.g. modem, 4 alexa's, router, printer, garage door, clocks, etc.). he is rather annoyed about this! how much is that costing him per year if his average electricity cost is $0.15 per kwh?

The expressions that have the units of kg ⋅ m/s² are as follows: m da/dt, m dv/dt, and m ∫ a dt.

Given: x is position, v is velocity, m is mass, and a is acceleration.

The unit of force is kg m/s², i.e. Newton.

Using the concept of Force, we can analyze which of the given expressions has the units of kg m/s² as follows:

Using Newton's second law of motion, we have

F = ma or a = F/mor m a = F

Differentiating the equation w.r.t time, we get

m (da/dt) = dF/dt ………………………………………(i)

From Newton's third law, we know that every action has an equal and opposite reaction.

Therefore, dF/dt = dp/dt

Where p is momentum.

So, m (da/dt) = dp/dt

Now, we know that the unit of momentum is kg m/s

So, the unit of dp/dt is kg m/s²

This implies that the unit of (da/dt) is m/s²which further implies that the unit of (m da/dt) is kg m/s²

Hence, m da/dt is the correct option that has the units of kg m/s².

Also, m dv/dt can be rewritten as md/dt (dx/dt).

Using product rule of differentiation we can write,

d/dt (mx') = m d/dt x' + x d/dt m = m d²x/dt² + x dm/dt

where x' = dx/dt

Similarly, d/dt (mv) = m d/dt (dx/dt) + v d/dt m = m d²x/dt² + v dm/dt

So, m dv/dt has the unit of kg m/s²

Next, m ∫ a dt can be differentiated w.r.t. time to get m a.

This implies that the unit of m ∫ a dt is kg m/s².

The other options given do not have units of kg m/s².

Therefore, the correct expressions that have the units of kg m/s² are m da/dt, m dv/dt, and m ∫ a dt.

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Answer:

In a longitudinal wave, the crest and trough of a transverse wave correspond respectively to the compression, and the rarefaction.

Explanation:

The distance of the trip that Kayak travelled at an average speed of 18 mph in 5 hour is 90 miles

First, we shall obtain the eqaution to determine the distance. This can be obtained as follow:

Speed is defined as:

Speed = distance / time

Cross multiply

Distance = speed × time

With the above formula, we can obtain the distance. Details below

The following data were obtained from the question:

Distance = speed × time

Distance = 18 × 5

Distance = 90 miles

From the above calculation, we conclude that the distance traveled is 90 miles

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Answer As a wave travels across the open ocean, it gains speed. When a wave reaches a shallow coastline, the wave begins to slow down due to the friction caused by the approaching shallow bottom. ... Think of it like driving a car at high speed and then slamming on the breaks. Everything is going to fly to the front.:Waves at the Shoreline: As a wave approaches the shore it slows down from drag on the bottom when water depth is less than half the wavelength (L/2). The waves get closer together and taller. ... Eventually the bottom of the wave slows drastically and the wave topples over as a breaker. hope this helps have a nice night❤️❤️❤️

Explanation:

The velocity at the end of vaneless space(state 3) is  965.92 m/s

It increases kinetic energy to the airstream using a rotating element and then converts it into potential energy in the form of pressure.

Temperature at state 2, T₂ =T₀ + c/2Cp

Substitute T₀ =450K, c=250m/s, Cp =1005, we get

T₂ =418.90K

From the velocity triangle, sinβ₂ =c₂/v₂

v₂ = 250/sin (90°-75°) = 965.92 m/s

Thus, the velocity at the end of vaneless space is 965.92 m/s.

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The speed with which a wave travels on the piano string is 153.4 m/s.

To find the speed of a wave on a string, we can use the formula v = √(T/μ), where v is the wave speed, T is the tension in the string, and μ is the mass per unit length. Given that the mass per unit length (μ) is 5.20 x 10^-3 kg/m and the tension (T) is 1200 N, we can plug these values into the formula:
1. Calculate the square root of the tension (T) divided by the mass per unit length (μ): √(1200 N / 5.20 x 10^-3 kg/m)
2. Solve the equation: √(1200 / 5.20 x 10^-3) ≈ √(230769.23) ≈ 153.4

Therefore, the speed with which a wave travels on the piano string is approximately 153.4 m/s.

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Of the three models described, Model A needs the smallest amount of water to be completely filled, with a volume of 789.75 cubic feet. Model B has a volume of 800 cubic feet, and Model C has a volume of 810 cubic feet.

To determine which of the three models needs the smallest amount of water to be completely filled, we need to calculate the volume of each pool and compare them.

The formula to calculate the volume of a rectangular pool is: Volume = Length x Width x Depth
Let's start with Model A:
Length = 18 feet
Width = 9 3/4 feet = 9.75 feet
Depth = 4 1/2 feet = 4.5 feet

Using the formula above, we can calculate the volume:
Volume of Model A = 18 feet x 9.75 feet x 4.5 feet
Volume of Model A = 789.75 cubic feet

Now let's move on to Model B:
Length = 16 feet
Width = 10 feet
Depth = 5 feet

Using the same formula, we can calculate the volume of Model B:Volume of Model B = 16 feet x 10 feet x 5 feet
Volume of Model B = 800 cubic feet

Finally, let's calculate the volume of Model C: Length = 15 feet
Width = 12 feet
Depth = 4 1/2 feet = 4.5 feet
Volume of Model C = 15 feet x 12 feet x 4.5 feet
Volume of Model C = 810 cubic feet

So, of the three models described, Model A needs the smallest amount of water to be completely filled, with a volume of 789.75 cubic feet. Model B has a volume of 800 cubic feet, and Model C has a volume of 810 cubic feet.

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Answer:

12 m/s

Explanation:

Given,

Kinetic energy ( K.E ) = 18000 J

Mass ( m ) = 250 kg

To find : Velocity ( v )

Formula : -

K.E = mv²/2

v² = 2 K.E / m

   = 2 x 18000 / 250

   = 2 x 72

   = 144

   = 12 x 12

v² = 12²

v = 12 m/s

Therefore,

the velocity of the car is 12 m/s

Using the scale model of the Sun given;

The diameter of the Milky Way is about 1 × 10¹⁸ km.

The diameter of the Sun is about 1.4 × 10⁶ km

The diameter of the Earth is about 1.27 × 10⁴ km.

Using the scale model of the Sun given, the diameter of the Milky Way = (1 × 10¹⁸ km/1.4 × 10⁶ km) × 0.6 m

The diameter of the Milky Way = 4.28 × 10¹¹ m

Using the scale model of the Sun given, the diameter of the Milky Way = (1.27 × 10⁴ km/1.4 × 10⁶ km) × 0.6 m

The diameter of the Earth = 5.44 × 10⁻³ m

In conclusion, the diameter of the Milky Way is far bigger than the Sun while the diameter of the Sun is about 5400 times bigger than the Earth.

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The acceleration of the particle at 3s is [tex]a = 6 \beta \)

\(v = \alpha + \beta {t}^{2} \)

\(a = \frac{dv}{dt} \\ v = \alpha + \beta {t}^{2} \\ \frac{dv}{dt} = 0 + 2 \beta t \\ \)

if Time is given as 3s

therefore, Acceleration is

\(a = 2 \beta t \\ a = 2 \beta 3 \\ a = 2 \times \beta \times 3 \\ a = 6 \beta \)

Acceleration is

\(a = 6 \beta \)

This is the change in velocity with respect to time.

Velocity is a vector quantity that denotes the rate of change of position with respect to time, or a speed with the directional component.

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Explanation:

The average speed of a modern cruise ship is roughly 20 knots (23 miles per hour), with maximum speeds reaching about 30 knots (34.5 miles per hour).

99.1° Fahrenheit is Median Temperature of the Patient's Temperature who was recorded In degrees Fahrenheit every hour for 8 hours. Thus, option C is correct.

The middle number in a sorted, ascending or descending list of numbers is called the median, and it can be more descriptive of a data set than the average. It represents the midpoint of the data because it is the point above and below which 50% of the observed data falls.

Median = \($\mathrm{\frac{(n/2) term +(n/2 + 1) term }{2} }\)

Here, n/2 term is 8/2 = 4th term = 99.0°  (in ascending order)

n/2 + 1 term = 5th term = 99.2°  (in ascending order)

So,

Median = \($\mathrm{\frac{99.0^{\circ}+99.2^{\circ}}{2} }\)

Median = \($\mathrm{\frac{198.2^{\circ}}{2} }\)

Median = 99.1°

Thus, 99.1° Fahrenheit is Median Temperature of the Patient's Temperature who was recorded In degrees Fahrenheit every hour for 8 hours

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There will be no change in the answer.

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Answer:

ok

Explanation:

Have a nice day!

When the block  of iron is  placed  in water  the volume of water that   is  displaced is 27.0  cm³

Hence, Option D is correct.

Explain in detail.

therefore the volume displaced = 27 cm³  since the volume of water displaced  is equal to  volume of block.

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A butterfly flutters at a rate of 18 feet per minute. This is an example of speed .

Speed is defined as. The rate of change of position of an object in any direction. Speed is measured as the ratio of distance to the time in which the distance was covered.

In the above question " A butterfly flutters at a rate of 18 feet per minute " , it can be observed that there is a magnitude as well as unit .

here , the magnitude is 18 and the unit is feet per minute , which is a unit of speed as the SI unit of speed is m/s .

hence , this is an example of speed as speed is been measured by this unit .

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Answer:

The average speed is 5.8 m/s

Explanation:

I just did it

Answer:

C

Explanation:

you need to be able to see through a colour filter, which means youd need transparent or translucent

Transparent materials passes light and they reflect also. The color filters are made by transparent or translucent materials. Thus option c is correct.

The ability of a material to pass light through it is called transparency. Some transparent materials can reflect the light. For example mirror, glasses etc. The materials which passes light but are not transparent is called translucent materials.

The material which does not pass light inside is called opaque. Wood, plastics etc. are opaque materials. Transparent covers, glasses make their inside visible.

Colour filters are made by transparent or translucent materials. They are used to filter or choose a particular colour from a group of reflected lights.

Color filters are used in spectrometers and other optical devices. They filter the incoming wavelengths to select the desired one. Hence, option c is correct.

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Answer:

Explanation: honestly i don’t speak spanish so please explain with english

What does "the following" mean ?

Kinetic energy is directly proportional to speed² .

So kinetic energy doubles if the speed is increased by √2 .

(3 m/s) · (√2)  =  4.243 m/s

The cable has two connectors that induce a loss of 2 dB each: The signal level at the input of the antenna is 8 dBm. The correct option is a.

The signal level at the input of the antenna can be determined by subtracting the losses from the transmitted signal power.

Transmitted signal power = 15 dBm

Cable loss = 3 dB

Connector losses (2 connectors) = 2 dB each

To calculate the signal level at the input of the antenna, we need to subtract the losses from the transmitted signal power.

Start with the transmitted signal power:

15 dBm

Subtract the cable loss:

15 dBm - 3 dB = 12 dBm

Subtract the losses from the connectors:

12 dBm - 2 dB - 2 dB = 8 dBm

Therefore, the signal level at the input of the antenna is 8 dBm. The correct option is a.

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To find the magnitude of the gravitational acceleration on the planet, we can use the formula for the period of a simple pendulum:

T = 2π√(L/g),

where T is the period, L is the length of the pendulum, and g is the gravitational acceleration.

Given:

Length of the pendulum (L) = 55.0 cm = 0.55 m

Number of swing cycles (n) = 102

Time (t) = 141 s

The period (T) of the pendulum can be calculated by dividing the total time (t) by the number of swing cycles (n):

T = t/n.

Now, rearranging the formula for the period of a pendulum, we have:

g = (4π²L) / T².

Substitute the values and calculate the magnitude of the gravitational acceleration (g):

g = (4π² * 0.55 m) / ( (141 s) / (102) )².

Simplifying the expression will give us the final numerical value of the gravitational acceleration on the planet in meters per second squared (m/s²).

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Answer:

Potential Energy = mass × gravity × height

= 22.3kg × 9.8m/s² × 15m

= 3278.1 joules

Answer:

= 22.3kg × 9.8m/s² × 15m

= 3278.1 joules

Explanation:

Answer:Electricity works by getting a bunch of conductor elements together and creating a flow of electron-stealing patterns through them. This flow is called a current. ... Once you can control the direction the electrons are going, you can use them to power or charge anything from a light bulb to your TV to your electric car.

Explanation:trust

The gymnast completes 10 revolutions in the air.

The law of conservation of angular momentum states that the total angular momentum of a system remains constant if no external torques act on the system. In this case, the gymnast starts with a certain amount of angular momentum while performing the cartwheels on the ground, and this angular momentum is conserved as she launches herself into the air and performs flips.

Let I1 be the moment of inertia of the gymnast while performing the cartwheels, and omega1 be the spin rate. When she launches into the air, she changes her moment of inertia to I2 and starts rotating at a new spin rate, omega2. According to the law of conservation of angular momentum:

I1 * Ω1 = I2 * Ω2

We can rearrange this equation to solve for omega2:

Ω2 = (I1 * Ω1) / I2

Now, we can use the equation for rotational kinematics:

θ  = Ω * t

where theta is the total angle rotated, omega is the spin rate, and t is the time. We can solve for the number of revolutions by converting the angle rotated into revolutions:

revolutions = θ/ (2*pi)

Plugging in the given values, we get:

Ω1 = 0.5 rev/s

I1 = (given)

I2 = (given)

t = 2.0 s

Using the conservation of angular momentum equation, we can solve for omega2:

Ω2 = (I1 * Ω1) / I2

Plugging in the values, we get:

Ω2 = (I1 * 0.5) / I2

Using the equation for rotational kinematics, we can solve for the total angle rotated in radians:

θ = Ω2 * t

Converting this angle to revolutions, we get:

revolutions = θ/ (2*pi)

Plugging in the values, we get:

revolutions = (Ω2 * t) / (2*pi) = 10 revolutions (rounded to the nearest whole number)

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When synthesizing methyl-p-nitrobenzoate and methyl-o-nitrobenzoate, destabilized cationic intermediates can form as minor products.

These intermediates are formed when the reaction conditions favor the formation of a carbocation intermediate rather than the intended product. Carbocation intermediates are highly reactive and unstable, which can lead to the formation of unexpected products. In the case of methyl-p-nitrobenzoate and methyl-o-nitrobenzoate synthesis, destabilized cationic intermediates can lead to the formation of byproducts or isomers that are different from the desired product. To minimize the formation of destabilized cationic intermediates, reaction conditions must be carefully controlled to favor the formation of the desired product over any competing reactions.

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Answer:

jump higher

Explanation:

this is due to the Moon's surface gravity being weaker because it is far less massive than Earth. A body's surface gravity is proportional to its mass, but inversely proportional to the square of its radius.

Answer:

K = 9000 J

Explanation:

Given that,

The mass of a boat, m = 2000 kg

The velocity of the boat, v = 3 m/s

We need to find the kinetic energy of the boat. We know that the kinetic energy of an object is given by :

\(K=\dfrac{1}{2}mv^2\\\\K=\dfrac{1}{2}\times 2000\times 3^2\\\\K=9000\ J\)

So, the required kinetic energy is equal to 9000 J.