What should people do to save blue whales?

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:

KE = ½mv² = ½(0.100)20.0² = 20.0 J

Explanation:

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!

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:

Explanation:

The weight of the truck will equal the weight of the displaced water.

Assuming fresh water and that the sides of the ferry are vertical,

The volume of the water displaced is

6.00(4.00)(0.0400) = 0.960 m³

that volume of water weighs

0.960 m³(1000 kg/m³)(9.81 N/kg) = 9,417.6 = 9.42 kN

where's the crossword?

Answer:

The lithosphere is the Earth's stable outer layer. The lithosphere is made from the brittle top mantle and the crust, which are the Earth's outermost layers. The atmosphere above it and the asthenosphere (another issue of the top mantle) underneath it define its limitations. even though the rocks of the lithosphere are nevertheless taken into consideration elastic, they may be not viscous. The asthenosphere is viscous, and the lithosphere-asthenosphere boundary (LAB) is the component in which geologists and rheologists—scientists who study the drift of depend—mark the difference in ductility among the 2 layers of the top mantle. Ductility measures a strong cloth’s ability to deform or stretch under strain. The lithosphere is a long way less ductile than the asthenosphere.

Explanation:

Plagarism checked, 100% unique [I think, if not sorryyyyeeeeee]

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Answer:

d

Explanation:

you record it during the test

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

Answer:

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

so the answer is a

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:

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

Answer:

reduce

Explanation:

It will reduce the wavelenth

Answer:

a) 889 N / m

b) 133 N

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

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.

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:

4.80 seconds

Explanation:

The velocity of sound is obtained from;

V= 2d/t

Where;

V= velocity of sound = 329.2 ms-1

d= distance from the wall = 790.5 m

t= time = the unknown

t= 2d/V

t= 2 × 790.5/ 329.2

t= 4.80 seconds

The time is taken by the sound to reach the hiker will be  t= 4.80 seconds

The sound velocity is defined as the distance traveled by the sound wave in a particular direction with respect to time.

The velocity of sound  is given by the formula:

[tex]V=\dfrac{2d}{t}[/tex]

Here;

V= velocity of sound = 329.2  [tex]\frac{m}{s^2}[/tex]

d= distance from the wall = 790.5 m

t= time = the unknown

The time will be calculated as:

[tex]t=\dfrac{2d}{V}[/tex]

[tex]t=\dfrac{2\times 790.5}{329.2}[/tex]

[tex]t=4.80\ seconds[/tex]

Hence the time is taken by the sound to reach the hiker will be  t= 4.80 seconds

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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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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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Answer:

Explanation:

½m5² / ½m20² = 25/400 = 1/16 = 0.0625

Answer:

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

Explanation:

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.

The distance that will take the car to speed yup from 20m/s to 50m/s is 262.5 meters

The first step is to write out the parameters given in the question are

acceleration= 4

initial velocity= 20

final velocity= 50

The distance can be calculated as follows

V²= U² + 2as

50²= 20² + 2(4)(s)

2500= 400= 8s

2500-400= 8s

2100= 8s

s= 2100/8

s= 262.5 meters

Hence the distance is 262.5 meters

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From the definition of acceleration, the time it will take the car to speed up is 7.5 seconds

Given that a car accelerates at a rate of 4.00 m/s^2. To calculate how long it will take the car to speed up from 20 m/s to 50 m/s, let us first mark out the needful parameters.

Acceleration a = 4 m/[tex]s^{2}[/tex]

Initial velocity U = 20 m/s

Final Velocity V = 50 m/s

Time t = ?

From the definition of acceleration, acceleration is the rate of change of velocity. That is,

a = (V - U)/ t

Substitute all the parameters into the formula above.

4 = ( 50 - 20) / t

Cross multiply

4t = 30

Make t the subject of formula

t = 30/4

t = 7.5 t

Therefore, the time it will take the car to speed up is 7.5 seconds

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Answer:

6.93 kg

Explanation:

m1 = 8.90 kg

T1 = -5°C

m2 = 12 kg

T2 = 15°C

constant needed:

c (ice) = 2100 J/kg °C

c (water) = 4200 J/kg °C

L (Latent Heat) = 336 000 J/kg

Black Principle

Q (release) = Q (absorbs)

Q (release) max = m2 c(water) ∆T2

Q (release) max = 12 x 4200 x (15-0)

Q (release) max = 756 000 J

Q (absorbs) = m1 c(ice) ∆T1 + m1 L

Q (absorbs) = 8.9 x 2100 x (0-(-5)) + 8.9 x 336 000

Q (absorbs) = 93 450 + 2 990 400 = 3 083 850 J

since Q (absorbs) is much much bigger than Q (release), only a few litlle ice melting. So we need to see how much ice melting and how many left.

Q (release) - Q (absorbs) ice -5°C to ice 0°C = 756000 - 93450 = 662550

mass of melting Ice

Q (absorbs) melting ice = m(melting) L

662 550 = m(melting x 336 000

m (melting) = 662 500/336 000

m (melting) = 1.977 kg

so the ice remains is 8.90 - 1.97 = 6.93 kg

[tex]\huge\bold{\purple{\bold{⚡A. Energy⚡}}} [/tex]

[tex]\huge\underline\mathtt\colorbox{cyan}{Reason:}[/tex]

When a force causes a body to move, work is done on the object by the force. Work is the measure of the energy transfer when a force 'F' moves an object through a distance 'd'. So we say that energy is transferred from one energy store to another when work is done, and therefore, energy transferred = work done.

Answer:

noice me too U n U

Explanation:

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:

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