Base in your questions that ask what cause the bright lines seen in the emission spectrum and i think the best answer to that is the H2 gas is used when protons was heated so the electron absorb all the photons and get exited and resulted by given of a light.
Answer:
B) T > ma.
Explanation:
To solve this problem, we have to analyze the forces acting in the horizontal direction.
In the horizontal direction, we have:
- The horizontal component of the tension in the wire, , where T is the magnitude of the tension and the angle that the wire makes with the horizontal
Since this is the only force acting on the box in the horizontal direction, this is also the net force, so it is equal to the product of mass and acceleration (Newton's second law of motion):
where
m is the mass of the box
a is the acceleration
We can rewrite the equation as
The angle in this problem is , so
Therefore, the correct option is
B) T > ma.
11. Density of the piece of wood = 3000 g/cm³
12. Density of wooden block = 2 g/cm³. and it will not float in water.
13. Volume of the plastic ball should be 250 mL
14. Mass of the ice cube = 0.162 g
15. Volume of gasoline spilled is equal to 2000 mL
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11.
<u>Formula:</u>
Given:
Mass of wood piece = 7500 g
Volume of wood piece = 2.5 cm³
Therefore,
Density of the piece of wood = 3000 g/cm³
12.
<u>Formula:</u>
Given:
Dimensions of wooden block = length × width × height = 5 cm × 4 cm × 2 cm
Mass = 80.0 g
Volume of wooden block =
Therefore,
Density of wooden block = 2 g/cm³.
Density of water is equal to 1 g/cm³
2 g/cm³ > 1 g/cm³
Since density of wooden block is greater than the density of water, the piece of wood will not float in water. It will sink.
13.
<u>Formula:</u>
Given:
Mass of the ball = 125 g
Density = 0.5 g/mL
Therefore,
Volume = 250 mL
Volume of the plastic ball should be 250 mL
14.
<u>Formula:</u>
Given:
Dimensions of ice cube = length × width × height = 3 cm × 3 cm × 3 cm
Density = 0.006 g/mL
Volume of ice cube =
Since,
Therefore,
Mass of the ice cube = 0.162 g.
15.
<u>Formula:</u>
Given:
Mass of gasoline = 1330 g
Density = 0.665 g/mL
Therefore,
Volume = 2000 mL
Volume of gasoline spilled is equal to 2000 mL
Answer:
B. has the greatest mass
Explanation:
mass & distance affect pull
grativy affects speed & shape of orbit of the planet
quiziz
Answer:
20 rad/s^{2}
Explanation:
weight / force (F) = 150 N
radius (r) = 0.5 m
mass (m) = 15 kg
angular acceleration = tangential acceleration / radius
where
- tangential acceleration = force/ mass = 150/15 = 10 m/s^{2}
- substituting the above into the equation for angular acceleration we have
angular acceleration = 10 / 0.5 =