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IRINA_888 [86]
3 years ago
12

a rocket can move thrpough outer space where no matter exists for it to push on because the rocket ejects gas molecules these ga

s molecules push agaisnt the rocket true or false
Physics
1 answer:
lubasha [3.4K]3 years ago
8 0

Answer: True.

Explanation:

Since the gases are given momentum as they are ejected by the rocket engine, a rocket moves in space. Consider the rocket in space as it rests. The device does not have any momentum. Next, it ignites the engine. As the exhaust gases go in one direction, to keep the overall momentum of the device steady, the rocket goes in the other. This shift in momentum of the gases gives the rocket the "push" to move forward. This push is what we call the thrust of the rocket.

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A 2.0-Coulomb bead is given 20 Joules of electric potential energy by lifting it from the "ground" to point A. If a second bead
Katen [24]

Answer:

40 J

Explanation:

c_1 = 4 C

c_2 = 2 C

U_1 = 20 J

The potential energy is directly proportional to the charge of the particle

U\propto c

\dfrac{U_2}{U_1}=\dfrac{c_2}{c_1}\\\Rightarrow U_2=\dfrac{U_1c_2}{c_1}\\\Rightarrow U_2=\dfrac{20\times 4}{2}\\\Rightarrow U_2=40\ J

The potential energy expected is 40 J

4 0
3 years ago
A rock is thrown horizontally out of a window with a velocity of 20.0 m/s. If the window is 8.50m above the ground, how far
vladimir1956 [14]

The distance from the base of the building the rock will land is 26.4 m

<h3>Data obtained from the question </h3>
  • Horizontal velocity (u) = 20 m/s
  • Height (h) = 8.50 m
  • Distance (s) =?
<h3>Determination of the time to reach the ground </h3>
  • Height (h) = 8.50 m
  • Acceleration due to gravity (g) = 9.8 m/s²
  • Time (t) =?

h = ½gt²

8.5 = ½ × 9.8 × t²

8.5 = 4.9 × t²

Divide both side by 4.9

t² = 8.5 / 4.9

Take the square root of both side

t = √(8.5 / 4.9)

t = 1.32 s

<h3>How to determine the distance </h3>
  • Horizontal velocity (u) = 20 m/s
  • Time (t) = 1.32 s
  • Distance (s) =?

s = ut

s = 20 × 1.32

s = 26.4 m

Learn more about motion under gravity:

brainly.com/question/22719691

6 0
3 years ago
an automobile panel lamp with a resistance of 33 ohm is placed across the battery shown in Figure 11. What is the current throug
Free_Kalibri [48]
Ohm's law state that V=IR
so I= \frac{V}{R}=I= \frac{12}{33}= 0.364A

Hope this helps!
4 0
3 years ago
The speed of sound in room temperature (20°C) air is 343 m/s; in room temperature helium, it is 1010 m/s. The fundamental freque
Lera25 [3.4K]

Answer: f = 927.55Hz

Explanation: Since the the tube is open-closed, the length of air and the wavelength of sound passing through the tube is given below

L = λ/4 where λ = wavelength.

speed of sound in air = v = 343m/s.

fundamental frequency of open closed tube = 315Hz

λ = 4L.

v = fλ

343 = 315 * 4L

343 = 1260 * L

L = 343/ 1260

L = 0.27m

In the same tube of length L = 0.27m but different medium ( helium), the speed of sound is 1010m/s.

The length of tube and wavelength are related by the formulae below

L = λ/4, λ=4L

λ = 4 * 0.27

λ = 1.087m.

v = fλ

1010 = f * 1.087

f = 1010/1.807

f = 927.55Hz

4 0
3 years ago
Which is present when iodine changes from brown to blue or purple?
vladimir1956 [14]


If iodine is added to a starch solution, they react with each other and the iodine  darkens to an almost pitch black.

however, if iodine is added to a solution containing no starch, it will show up only as an extremely pale brown. almost colorless and hardly visible.

when following the changes in some inorganic oxidation reduction reactions, iodine may be used as an indicator to follow the changes of iodide ion and iodine element. soluble starch solution is added. only iodine element in the presence of iodide ion will give the characteristic blue black color. neither iodine element alone nor iodide ions alone will give the color result.

hope this answer really helps your question :)

5 0
3 years ago
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