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4 years ago

Why is the slope of position vs time squared 1/2a?

1 answer:

8 0

<span>The 1/2a represents the mini pixel an angle of the curved shape, as describe by its measurement, angle in numbers. The Shape in Position resents it's center lined up to an graphed chart at center.</span>

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A car moves from rest condition moves with acceleration 4 ms^-2.After 5s,calculate velocity of the car and the distance traveled

lisov135 [29]

Answer:

1) 20 m/s

2) 60 meters

Explanation:

with a constant acceleration of 4m/s/s, the vehicle will end up traveling at 20 m/s after 5 seconds, and will have travelled 60 meters.

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4 years ago

16 grams of ice at –32°C is to be changed to steam at 182°C. The entire process requires _____ cal. Round your answer to the nea

ICE Princess25 [194]

Answer:

12432 cal.

Explanation:

The process to change ice at -32 ºC to steam at 182 ºC can be divided into 5 steps:

1. Heat the ice to 0 ºC, which is the fusion temperature.

2. Melt the ice (obtaining liquid water), which is a process at constant pressure and temperature, so the liquid obtained is also at 0ºC.

3. Heat the liquid water from 0 ºC to 100 ºC, which is the vaporization normal temperature of the water.

4. Vaporization of all the water; this is also a process that occurs at constant pressure and temperature, so the produced steam will be at 100ºC.

5. Heat the steam from 100 ºC to 182 ºC.

Each process has a required energy, and the sum of the energy required for each and all of the steps is the total amount of energy required for the whole process:

$E_T=E_1+E_2+E_3+E_4+E_5$

$E_1$ is a heating process for the ice, so we know that the energy required is proportional to the temperature difference through the specific heat:

$E_1=m*Cp_{sol}*(T_2-T_1)\\E_1=16g*0.5\frac{cal}{gC}*(0-(-32))=256cal$

$E_2$ is a phase change process, so we do not use the specific heat (sensible heat), but the fusion heat (latent heat), so:

$E_{2}=m*dh_{f}={16g*80\frac{cal}{g}}=1280cal$

Analogously,

$E_3=m*Cp_{liq}*(T_3-T_2)=16g*1.00\frac{cal}{gC}*(100-0)C = 1600 cal$

$E_{4}=m*{dh_{vap}}\\\\E_4=16g*540\frac{cal}{g} =8640cal$

$E_{5}=m*Cp_{vap}*(T_{5}-T_{4})\\E_{5}={16g*0.5\frac{cal}{gK}*(182-100)K}=656cal$

Finally, the total energy required is:

$E_T=256cal+1280cal+1600cal+8640cal+656cal\\E_T=12432cal$

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3 years ago

Which statement best describes Cleo's mistake? Light travels through air and water in angled, scattered paths. Light does not ch

pashok25 [27]

<u>The question</u> (obtained from the internet);

Cleo stated that light travels through air in straight paths, and when it moves from air to water, light changes direction, speeds up, and bends towards the normal

Answer:

The statement that best describes Cleo's mistake is;

Light slows down when it moves from air into water

Explanation:

The question;

Cleo stated that light travels through air in straight paths, and when it moves from air to water, light changes direction, speeds up, and bends towards the normal

The speed of light in water = 225,000 km/s

The speed of light in air = 299,702,547 m/s

The speed of light in vacuum = 299,792,458 m/s

Therefore, light slows down when it moves from a less dense medium to a denser medium

Light moves closer (bends) towards the normal when it moves from air into water. Light therefore, changes direction, and light moves in straight path which is known as rectilinear motion

Therefore, the statement that describes Cleo's mistake is that light actually slows down when it moves from air into water.

5 0

3 years ago

Future space stations will create an artificial gravity by rotating. Consider a cylindrical space station 780 m diameter rotatin

ser-zykov [4K]

Answer:1.513 rps

Explanation:

Given

Diameter of cylindrical space $d=780\ m$

When the station rotates it creates centripetal acceleration which is given by

$a_c=\omega ^2r$

Now it must create the effect of gravity so

$g=\omega ^2r$

$\omega =\sqrt{\frac{g}{r}}$

$\omega =0.158\ rad/s$

and $\omega =\frac{2\pi N}{60}$

Thus $N=\frac{4.755}{3.142}$

$N=1.513\ rps$

5 0

3 years ago

In comparing the gravitational force and the electrical force between two protons, the electrical force is _____ relative to the

EastWind [94]

The electrical force is greater.
I'm not going to look it up and work it out right now,
but it seems to me that the electrical force is bigger
by a factor of something like 10⁴⁰ . That's a lot !

8 0

3 years ago