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Marina CMI [18]
3 years ago
7

Help pleaseeeeeeee!!!!!!!

Physics
1 answer:
Mariana [72]3 years ago
8 0

Explanation:

If ice is heated below the triple point of pressure of ice then it will directly convert to water vapor. This process is called sublimation.

<em>In these kind of questions pressure is generally kept constant. So, make a constant pressure line which is horizontal line in this graph. Now when something is heated then its temperature increases. So, move from left side to right side on the constant pressure line.</em>

In this case, on moving along the constant pressure line is below the triple point, the first encountered line is line of sublimation ahead of which is vapor phase. So if you give heat to ice at a pressure below constant pressure line than it will directly convert to water vapor.

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The doppler effect states that the motion of any object can ________
pshichka [43]

Answer:

shift the wavelength of spectral lines

Explanation:

The Doppler effect is commonly used in the field of astronomy to study the motion of astronomical objects such as a star, planets, and distant galaxies. This results in the changing of wavelength and shifting of the spectral lines, due to the relative and continuous motion of the receiver and the source. This is known as the red-shifting, where the lights in the spectrum move towards the highest wavelength, i.e towards the red light. This Doppler effect signifies that the distance between the distant galaxies and earth increases with the increasing recessional velocity.

3 0
3 years ago
A paintball is fired horizontally from a tower 45 m above the ground. If the paintball gun fires at 90 m/s… How long does it tak
ankoles [38]

Answer:

The time taken for the paint ball to hit the ground is t =  2.143 \ s

The distance of the landing point from the tower is d = 192.86 \  m

Explanation:

From the question we are told that

   The height of the tower is h =  45 \ m

    The speed of the paintball in the horizontal direction is  v_x =  90 \  m/s

Generally from kinematic equation we have that

      h =  ut + \frac{1}{2} at^2

Here u is the initial  velocity of the paintball in the vertical direction and the value is 0 m/s , this because the ball was fired horizontally

         a is equivalent to g  = 9.8\ m/s^2

        t is the time taken for the paintball to hit the ground

   So    

       45  =  0* t + \frac{1}{2} 9.8 * t^2

=>    t =  2.143 \ s

Generally the distance of its landing position from the tower is

         d = v  *  t

=>      d = 90 *  2.143

=>    d = 192.86 \  m

     

3 0
3 years ago
A small car with a mass of 800kg moving with a velocity of 27.8 m/s. The car stops at a yellow light in 3.9 seconds. What force
raketka [301]

Answer:

F = 5702.56 N

Explanation:

Given that,

Mass of a small car, m = 800 kg

Initial speed of the car, u = 27.8 m/s

Final speed, v = 0

Time, t = 3.9 s

We need to find the force did it take for the car to stop.

The force acting on an object is given by :

F=ma\\\\F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{800\times (0-27.8)}{3.9}\\\\F=-5702.56\ N

So, the magnitude of force acting on the car to stop is 5702.56 N.

4 0
3 years ago
One star has a mass slightly more than the mass of the sun. Which of these graphs would best model and predict the lifetime of t
Oksanka [162]

Answer:

b

Explanation:

6 0
4 years ago
Can someone pls help me with this?
11Alexandr11 [23.1K]

Answer:

17 - length of the fork

18 - number of turns

19 - material of the fork

Explanation:

7 0
3 years ago
Read 2 more answers
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