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antiseptic1488 [7]
2 years ago
9

A compact disc has a radius of 6 centimeters.

Physics
2 answers:
Vika [28.1K]2 years ago
5 0
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.
alex41 [277]2 years ago
5 0

Answer:75.389

Explanation:

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marysya [2.9K]

Hey I'm working on this test right now, did you ever get the answers?

7 0
3 years ago
an aircraft is flying at height of 3400m above the ground.if the angle subtended at a ground observation point by the aircraft p
Kamila [148]

Answer: 588.9 m/s

Explanation:

Given that :

θ = 30°

Height, h = 3400m

Time, t = 10 seconds

From trigonometry ;

Tanθ = opposite / hypotenus

Tan 30 = 3400 / x

x tan 30 = 3400

0.5773502x = 3400

x = 3400 / 0.5773502

x = 5888.9727

Recall ;

Speed = Distance / time

Speed = 5888.9727 / 10

Speed = 588.897 m/s

Speed = 588.9 m/s

7 0
3 years ago
a dog usually moves faster than a bug . That means that if i watch them move for one minute, then the dog would have traveled a
galben [10]
The dog would have traveled a greater distance than the bug.
The car goes faster than the dog and will travel to the end of the road faster than the dog.

Hope this helps! Have a great day :)

(ps. brainliest, please?)
4 0
3 years ago
Describe two of Tesla's inventions that influenced<br> technology and are still in use today.
victus00 [196]
The remote control, and wireless transmissions
3 0
2 years ago
A 0.50-g sample of vegetable oil is placed in a calorimeter. when the sample is burned, 18.9 kj is given off. what is the energy
just olya [345]

First of all, we need to convert the energy produced from kilojoules to calories. 1 kJ corresponds to 239.1 cal, therefore:

E=18.9 kJ \cdot 239.1 =4519.4 cal

And so now we can calculate the energy value of the oil:

E_v = \frac{E}{m}=\frac{4519.4 cal}{0.50 g}=9038.8 cal/g

8 0
3 years ago
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