A ball is dropped from 8.5 meters above the ground. If it begins at rest, how long does it take to hit the ground?

where's the crossword?

Answer:

Explanation:

28 / 70 = 0.3857142...  = 0.39 hr

280 / 100 = 2.8 hrs.

(100 - 0) / 10 = 10 m/s²

(60 - 20) / 4 = 10 m/s²

Answer:

[tex]F = kx \\ k = \frac{F }{x} [/tex]

so the answer is a

The work done on the gas as it is compressed from volume 1 to volume 2 is 146.7 J.

Given the data in the question;

Work done on the gas; [tex]W = \ ?[/tex]

From the first law of thermodynamic:

[tex]W = -P\delta v[/tex]

Where W is work done, P is pressure and [tex]\delta v[/tex] is  change in volume.

We substitute our values into the equation

[tex]W = -29688Pa * ( 0.00332m^3- 0.00826m^3)\\\\W = -29688Pa * -0.00494m^3\\\\W= 146.7 J[/tex]

Therefore, the work done on the gas as it is compressed from volume 1 to volume 2 is 146.7 J.

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Answer:

a) 889 N / m

b) 133 N

Answer:

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Acceleration is the rate of change of velocity as a function of time. For example a car traveling at 50 km/hr starts to accelerate, 10 seconds after, its speed changes to 100 km/hr then the acceleration of the car during the time can be calculated as below: initial speed = 50 km/hr.

Answer:

the ans is D... good luck

Answer:

The total number of atoms does not change, so mass is conserved in the reaction

So answer is 76

Explanation:

If you like my answer than please mark me brainliest thanks

In a chemical reaction, two molecules with a total mass of 76 amu react to form a single molecule. The mass of the molecule that is formed is equal to that of the total mass of two molecules which is 76 amu.

A chemical reaction may be defined as a type of reaction in which two or more molecules are combined as reactants in order to form a new compound which is known as a product.

In this question, according to the law of conservation of mass, mass can neither be created nor be destroyed in a given chemical reaction. So, if the total mass of two reactant molecules is 76 amu, then the resultant product also bears the same mass.

Therefore, the mass of the molecule that is formed is equal to that of the total mass of two molecules which is 76 amu.

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The diameter of a copper conductor is equal to 21.30 meters.

Given the following data:

To calculate the diameter of a copper conductor:

First of all, we would determine the resistance of the copper conductor by using the formula:

[tex]Resistance = \frac{Voltage }{Current} \\\\Resistance =\frac{8}{500}[/tex]

Resistance = 0.016 Ohms

Next, we would determine the area of the copper conductor:

[tex]Resistance = \frac{\rho l}{Area} \\\\Area = \frac{\rho l}{Resistance}\\\\Area = \frac{0.019 \times 300}{0.016}[/tex]

Area = 356.25 [tex]m^2[/tex]

For the diameter:

From the area of a circle, diameter is given by the formula:

[tex]Area = \frac{\pi d^2}{4} \\\\d=\sqrt{\frac{4A}{\pi} } \\\\d=\sqrt{\frac{4 \times 356.25}{3.142} }\\\\d=\sqrt{453.53}[/tex]

Diameter, d = 21.30 meters

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Answer:

In the remote past, people had no notion what function the brain has in the human organism. They saw “mush” and called it accordingly. Since brain was a borrowed word, those who began to use it, must at one time have had a native name for the content of heads.

does this help?

thanks for the points!

Answer:

noice me too U n U

Explanation:

Answer:

Explanation:

impact velocity is

√(18² + 2(-9.8)-51) = 36 m/s

average velocity is (17 + 36)/2 = 26.5 m/s

t = d/v = 51 / 26.5 = 1.9 s

or

if ground is origin and UP positive

0 = 51 - 17t - ½(9.8)t²

quadratic formula

t = (17 ±√(17² - 4(-4.9)(51))) / (2(-4.9))

t = (17 ± 36) / -9.8

t = - 5.4 s which we ignore as the stone is not thrown yet

or

t = 19 s

The time taken a radio signal to travel form the given distance to Earth is [tex]2.65 \times 10^8 \ s[/tex].

The given parameters;

The time taken a radio signal to travel form the given distance to Earth is calculated by using Echo formula as shown below;

[tex]2d = v \times t\\\\t = \frac{2d}{v}[/tex]

where;

The time taken for the signal to travel in a single forward motion is calculated as;

[tex]t = \frac{1}{2} \times \frac{2d}{v} = \frac{d}{v} \\\\t = \frac{9\times 10^{10}}{340} \\\\t = 2.65 \times 10^8 \ s[/tex]

Thus, the time taken a radio signal to travel form the given distance to Earth is [tex]2.65 \times 10^8 \ s[/tex].

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The orbital speed of the object moving around the circle is 10.5 m/s

Speed is the ratio of total distance to total time taken. Speed is given by:

Speed = distance / time

Given that the object is traveling in a circle of radius 10 m. The distance along the circle is:

Distance along circle = 2π * radius = 2π * 10 m = 62.83 m

The orbital speed = distance / time = 62.83 m / 6s = 10.5 m/s

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Answer:

D

Explanation:

Forces can change speed of motion, the more force that's applied when you push a ball for example, the faster the ball will go. Force can also change the shape of objects by applying pressure to them too. The inertia from force can change direction, as when you let's say hit a tennis ball, it won't go perfectly straight. So all of the above are correct

Answer:

sorry me computer is blocking the picture but i will try to unblock so i can answer

Explanation:

Answer: A

Explanation:i took this one

The Bermoulli's  equation allows us to find the pressure in the narrow part of the pipe through which water circulates is:

             P = 500 Pa

Bernoulli's equation is the work-energy relationship for fluids that are liquids and gases.

           [tex]P_1 + \frac{1}{2} \rho v_1^2 + \rho g y_1 = P2 + \frac{1}{2} \rho v_2^2 + \rho g y_2[/tex]

Where the subscripts 1 and 2 represent points of interest, P is the pressure, ρ the density of the fluid, v the velocity and y the height.

They indicate that the pipe is horizontal, that the pressure in the wide part P₁ = 200 kPa and the velocity is v₁ = 5 m / s and in the narrow part v₂=8.00 m/s, see attached.

Since the pipe is horizontal y₁ = y₂

           P₁ + ½ ρ v₁² = P₂ + ½ ρ v₂²

           P₂ = P₁ + ½ ρ (v₁² - v₂²)

Let's calculate

          P₂ = 200 10² + ½ ρ (5² - 8²)

          P₂ = 2 10⁴ - 19.5 ρ

For a specific calculation the value of the density of the fluid is needed, suppose that the fluid is water ρ = 1000 kg / m³

           P₂ = 2 10² - 19.5 1000

           P₂ = 500 Pa

In conclusion using the Bermoulli equation we can find the pressure in the narrow part of the pipe through which water circulates is:  

             P = 500 Pa

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The volume of the gas at standard temperature and pressure (STP) is 1,239.2 L.

The given parameters;

The volume of the gas at standard condition is calculated by applying general gas law as shown below;

[tex]\frac{PV}{T} = \frac{P_1V_1}{T_1} \\\\V = \frac{P_1V_1T}{T_1P} \\\\V = \frac{140 \times 9.5 \times 273}{293 \times 1} \\\\V = 1,239.2 \ L[/tex]

Thus, the volume of the gas at standard temperature and pressure (STP) is 1,239.2 L.

"Your question is not complete, it seems be missing the following information;"

A compressed air tank carried by scuba divers has a volume of 9.5 L and a pressure of 140 atm at 20∘C.

If the gas was instead in a cylinder with a floating, massless, frictionless piston, what would the volume of the gas be (in liters) at STP.

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Answer:

Nitrogen and hydrogen combine at the same rate that ammonia breaks down.

Explanation:

Hi there!

We can begin by converting cm to m:

4cm = 0.04 m

Use the following equation:

vf² = vi² + 2ad

The final velocity is 0 m/s, so:

0 = vi² + 2ad

vi² = -2(a)d

Plug in given values to solve for the acceleration:

800²/2(0.04) = -a

a = -8,000,000 m/s²

Find the force using the equation:

F = ma

F = (0.02)(-8,000,000) = -160,000 N

Newton's second law allows us to find the result for the acceleration of the mower is:

         a = 0.8 m / s²

Newton's second law says that the net force is proportional to the mass and the acceleration of the bodies.

             ∑ F = m a

where the bold letters indicate vectors, F is the force, m the mass and the acceleration of the bodies.

A free-body diagram is a schematic where the forces are drawn if the details of the bodies, see attached.

Let's write Newton's equation.

x-axis

         Fₓ = ma

y-axis

         N - F_y - w = 0

Let's use trigonometry to find the components of the force.

         Cos 45 = [tex]\frac{F_x}{F}[/tex]  

         sin 45 = [tex]\frac{F_y}{F}[/tex]  

         Fₓ = F cos 45

         F_y = F sin 45

Let's substitute.

         F cos 45 = m a

         a = [tex]\frac{F \ cos45}{m}[/tex]

Let's calculate.  

         a = [tex]\frac{32 \ cos 45}{21}[/tex]  

         a = 0.8 m / s²

In conclusion using Newton's second law we can find the result for the acceleration of the mower is:

         a = 0.8 m / s²

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The acceleration of the mower is 1.1m/s^2. The normal force exerted on the mower by the lawn is 145.5 N.

a) The force that moves the lawn mower in the horizontal direction is Fcosθ.

Where;

F = 32 N

θ = 45∘

Effective force that moves the mower forward = 32 N cos 45∘ = 22.6 N

Now;

F = ma

m = mass of the lawn mower

a = acceleration

a = F/m

a =  22.6 N/21 kg

a = 1.1 m/s^2

b) The normal force = mgcosθ

FN = 21 kg × 9.80 m/s × cos 45 ∘

= 145.5 N

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Answer:

the ans is D.... good luck

Answer:

[tex]COP_{Heating}[/tex][tex]= \frac{T_{H}}{T_{H}-T_{C} }[/tex]

The temperature must be in Kelvin: [tex]degrees Celsius+273.15=K[/tex].  

Explanation:

COP is similar to efficiency: [tex]\frac{what you get}{what you pay}[/tex] = [tex]\frac{energy from hot reservoir}{work needed for energy transfer}[/tex]

The maximum possible coefficient of performance (COP) for a heat pump is equal to 7.32.

The coefficient of performance can be described as the relationship between the power (kW) that is supplied to the compressor and the power (kW) that is drawn out of the heat pump as cooling or heat.

The coefficient of performance of a heat pump or air conditioning system is a ratio of useful heating or cooling provided to work or energy required. The COP usually exceeds 1, it pumps extra heat from a heat source to where the heat is needed.

Assume that the temperature of the hot reservoir is  [tex]T_H[/tex] and the temperature of the cold reservoir is [tex]T_c[/tex].

The temperature of the hot reservoir, T[tex]_H[/tex] = 20° C = 20 + 273 = 293 K

The temperature of cold reservoir, [tex]T_C[/tex] = -20°C = 273 -20 = 253 K

The equation of the maximum possible coefficient of performance for a heat pump is as follows:

[tex]COP_{max}= \frac{T_H}{T_H-T_c}[/tex]

[tex]COP_{max } = \frac{293}{293-253}[/tex]

COP = 7.32

Therefore, the maximum possible coefficient of performance for a heat pump is 7.32.

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Your question is incomplete, most probably the complete question was,

Find the maximum possible coefficient of performance for a heat pump used to heat a house in a northerly climate in winter. The inside is kept at 20°C and the outside is -20°C.

Answer:

Independent variable: Height

Dependent variable: time

Explanation:

Not sure what the experiment was, but assuming that this was the amount of time for a ball to reach the ground, the independent variable would be height since you determine and change the initial height. The dependent variable would be time since it changes with height, and you have to measure it.

Answer:

Think in your Mind

Explanation:

if you do you will have a better understanding of what you're doing

you could study you could ask a parent or guardian

or maybe stop looking up answer and expect other people breaking thier heads doing this

Answer:

B.) 100 W

Explanation:

Power = work/time = (Force * Distance)/Time

Force = 100 N

Distance = 2M

Time = 2 sec

Power = (100 * 2)/2 = 100 Watts

Thus the answer is B.) 100 W

This is between L3 and L4 and L4 and L5 of the lumbar Vertebrae of the vertebral column. The medical procedure is  also called Lumbar Puncture, vertebral puncture.

The fluid collected is called Cerebrospinal fluid (CSF).It acts as shock absorber for the brain and spinal cord. It also contains some nutrients for these organs.

Procedure.

The patient or subject must lie  by his side, and the knees draws up towards the chest. Alternatively, the subject can sit up or bent forward so that the vertebral column is bent  and locations above  revealed.

Then anesthesia is performed at the lower spine to neutralize the pain of the spine needle.

Finally, the spine needle is inserted between the L3 and L4 or L4 and L5 to draw a clear liquid; mostly water. This is CSF

The procedure may also be used to determine the pressure in the brain.

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Answer:

El atletismo es un deporte que incluye competencias atléticas basadas en las habilidades para correr, saltar y lanzar. El nombre se deriva del lugar donde se lleva a cabo el deporte, una pista de atletismo y un campo de hierba para los lanzamientos y algunos de los eventos de salto.

Explanation:

Yo se esto