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3 years ago

Please help me! 7th grade science!

Mathematics

1 answer:

Minchanka [31]3 years ago

4 0

Answer:

The answer is 20 watts

Step-by-step explanation:

power=joules/seconds

60/3=20

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Which linear function show a direct variation

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Answer:

it should be answer choice c but im not positive

Step-by-step explanation:

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3 years ago

In Daniel’s fifth grade class, 37.5% of the 24 students walk to school. One-third of the walkers got a ride to school today from

Alexeev081 [22]

The percentage of walkers who got a ride is 37.5/3=12.5%
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4 years ago

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3 years ago

Solve. x2 – 4x – 32 = 0

WINSTONCH [101]

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3 years ago

Read 2 more answers

An object oscillates 4 feet from its minimum height to its maximum height. The object is back at the maximum height every 3 seco

bulgar [2K]

Answer:

$y=2\text{cos}((\frac{2\pi}{3})t)$

Step-by-step explanation:

We have been given that an object oscillates 4 feet from its minimum height to its maximum height. The object is back at the maximum height every 3 seconds. We are asked to find the cosine function that can be used to model the height of the object.

We know that standard form of cosine function is $y = A\cdot \text{cos}(Bt-C)+D$ , where,

|A| = Amplitude,

Period = $\frac{2\pi}{|B|}$ ,

C = Phase shift,

D = Vertical shift.

Since distance between maximum and minimum is 4, therefore, amplitude will be half of it, that is, $A = 2$ .

Since objects gets back to its maximum value in every 3 seconds, therefore, period of the function is 3 seconds. We know that period is given by $\frac{2\pi}{|B|}$ , therefore, we can write $\frac{2\pi}{|B|}=3$ , therefore, $B = \frac{2\pi}{3}$ .

We haven't been given any information about phase and mid-line, we can assume the values of C and D to be zero .

Therefore, our function required function would be $y=2\text{cos}((\frac{2\pi}{3})t)$ .

6 0

4 years ago