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seropon [69]
3 years ago
10

Which scientist was the first to accurately measure the speed of light?

Physics
2 answers:
oksano4ka [1.4K]3 years ago
6 0

Answer:

Olaus Roemer was the first scientist to accurately measure the speed of  light.

Explanation:

nekit [7.7K]3 years ago
5 0
D. Olaus Roemer was the 1st
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Which of the following represents a chemical property of hydrogen gas? A) It is gaseous at room temperature. B) It is less dense
ehidna [41]

Answer:

C) It reacts explosively with oxygen.

Explanation:

Physical properties are usually those that can be observed using our senses such as color, luster, freezing point, boiling point, melting point, density, hardness and odor.

What are the Chemical Properties of Hydrogen? They are the characteristics that determine how it will react with other substances or change from one substance to another.

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4 years ago
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3 years ago
Which wave form oscillates both parallel and perpendicular to the direction of the wave motion? transverse waves, longitudinal w
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6 0
3 years ago
7. A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The oncoming water stream has
NNADVOKAT [17]

Answer:

The magnitude of the average force exerted on the water by the blade is 960 N.

Explanation:

Given that,

The mass of water per second that strikes the blade is, \dfrac{m}{t}=30\ kg/s

Initial speed of the oncoming stream, u = 16 m/s

Final speed of the outgoing water stream, v = -16 m/s

We need to find the magnitude of the average force exerted on the water by the blade. It can be calculated using second law of motion as :

F=\dfrac{\Delta P}{\Delta t}

F=\dfrac{m(v-u)}{\Delta t}

F=30\ kg/s\times (-16-16)\ m/s

F = -960 N

So, the magnitude of the average force exerted on the water by the blade is 960 N. Hence, this is the required solution.

6 0
4 years ago
A compact disc has a radius of 6 centimeters.
Vika [28.1K]
Circumference is 2\pi{r}=37.7 (approx.)
Speed is 4 times that. That is, 150.8 cm/s or 1.508 m/s.
If we get a point at distance 3 cm, we take the radius half of that. The circumference also gets half, so does the linear speed. We get 0.754 m/s or 75.398 cm/s.
5 0
3 years ago
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