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4 years ago

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A car starting from rest moves in a straight line with a constant acceleration of 1.95 m/s² for a distance of 110 m, then slows

down to a stop with a constant deceleration of 3.00 m/s². What is the total time of the travel?

1 answer:

Kitty [74]4 years ago

3 0

Ya know what you’re saying about the kids who don’t like men like me but they always seem

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What is the difference between mass and weight?

I am Lyosha [343]

Mass is the actual amount of material contained in a body and is measured by kg, gm, etc. Whereas weight is the force extorted by the gravity on that object mg. Note that mass is independent of everything but weight is different on earth, moon, etc.

5 0

3 years ago

Buster Posey hits a pop-up straight up. The velocity of the baseball as it leaves the bat is 42.5 m/s. Determine (a) the total t

SSSSS [86.1K]

Answer:

part a: 4.25s

part b: 180.625m

Explanation:

part a:

what we know: vi=42.5m/s

t=?

vf=0

g= -10m/s^2

----------------------------------------------------------

equation: vf-vi/g=t

plug in: -42.5m/s/ - 10m/s^2 = 4.25s

-----------------------------------------------------------

part b: 42.5m/s x(times) 4.25s = 180.625m

4 0

3 years ago

Which statement is true for two pieces of iron at the same temperature ? A. The total kinetic energy of their particles is equal

statuscvo [17]

The complete options are;

A. The average kinetic energy of their particles is the same.

B. The total kinetic energy of their particles is equal.

C. Heat flows from the larger object to the smaller object.

D. Heat flows from the object with higher potential energy to the object with lower potential energy.

Answer:

Explanation:

From the relationship between average kinetic energy and temperature, we have the formula;

E_k = (3/2)kT

Where;

k is a constant known as boltzmann constant.

T is known as temperature

We can see that at the same temperature (T), kinetic energy will remain the same because from the formula, E_k depends km only the temperature.

Thus, average kinetic energy of their particles saying that.

3 0

3 years ago

Yellow light with wavelength 600 nm is travelling to the left (in the negative x direction) in vacuum. The light is polarized al

kiruha [24]

Answer: (a) and (b) => check attached file.

(c). Picture (a) and (b) will both remain the same.

Explanation:

IMPORTANT: The solution to the question (a) and (b) that is (a) Draw a neat snapshot mode labeled vector picture of the wave. (b) Draw a neat movie mode labeled vector picture of the wave is there in the ATTACHED FILE/PICTURE.

It is also worthy of note to know that in anything Electromagnetic wave, the magnetic field, the Electric Field and their direction of propagation are perpendicular to each other.

Therefore, knowing the fact above we can say that in yellow light, the magnetic field is in the y-direction and the Electric Field is in the z-direction.

Hence, the solution to option C is given below;

(C).If the wave were to represent blue light instead of yellow light, picture (a) will remain the same because both light are Electromagnetic wave, although the wavelength will have to change. Picture (b) will also remain the same because they are both Electromagnetic waves and possess similar properties.

8 0

4 years ago

Imagine you use Nitrogen as your gas. If you have the cold side as cold as you can without liquefying it (78 K), and run the hot

alina1380 [7]

Answer:

The efficiency of a Stirling engine is 74%

Explanation:

Given:

Temperature of gas when it is cold $T_{1} = 78$ K

Temperature of gas when it is hot $T_{2} = 300$ K

The efficiency of a stirling engine,

$\eta =1 - \frac{T_{1} }{T_{2} }$

$\eta = 1- \frac{78}{300}$

$\eta = 1-0.26$

$\eta = 0.74$

∴ $\eta = 74 \%$

Therefore, the efficiency of a Stirling engine is 74%

5 0

3 years ago