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3 years ago

15

Cookware companies have been using a chemical called C-8, which helps to create a nonstick coating to pans. However, the Environ

mental Protection Agency (EPA) recently claimed that the use of C-8 in the manufacturing of nonstick cookware should be discontinued because studies show it causes cancer.

2 answers:

scoray [572]3 years ago

8 0

Answer: B: cookware manufacturers who make pans out of steel only

Nataly [62]3 years ago

6 0

Cookware manufactures who make pans out of steel only

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Your a should be 12, and your b should be 35. So now you can solve for c, which equals 37 miles.

So the answer is 37 miles

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3 years ago

A car goes from 20 m/s to 70 m/s in 4 seconds, what is its acceleration?

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3 years ago

Tarzan (mT=85.0 kg) is perched on a cliff 16.0 m above Jane. Jane is in the foreground is looking forwards. In the background, T

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Complete Question

The complete question is shown on the first uploaded image

Answer:

Part A

The velocity of Tarzan is $v_T = 17.7 \ m/s$

Part B

The percentage loss of kinetic energy is %-loss $= 61.4$ %

Part C

The speed would be exactly the same

Explanation:

From the question we are told that

The mass of Tarzan is $m = 85.5 \ kg$

The height of the cliff is $h = 16.0 \ m$

From the law of conservation of energy

$PE = KE$

Where PE is the potential energy of Tarzan at the top of the cliff which is mathematically represented as

$PE = mgh$

KE is the kinetic energy of Tarzan as he swings toward jane and is mathematically represented as

$KE = \frac{1}{2} mv^2_T$

So

$mgh = \frac{1}{2}m v_T^2$

=> $gh = \frac{1}{2} v_T^2$

Substituting values

$9.8 * 16 = \frac{1}{2} v_T^2$

=> $v_T = \sqrt{\frac{9.8 * 16}{0.5} }$

$v_T = 17.7 \ m/s$

From the question we are told that the actual velocity of Tarzan is

$v = 11 m/s$

The kinetic energy at the the velocity is mathematically represented as

$KE_A = \frac{1}{2} m v^2$

Substituting values

$KE_A = \frac{1}{2} (85) * 11^2$

$KE_A = 5142.5 J$

The kinetic energy at $v_T$ is

$KE = \frac{1}{2} * 85 * 17.7^2$

=> $KE = 13314.83\ J$

Now the percentage loss of kinetic energy is mathematically evaluated as

%-loss $= \frac{KE - KE_A}{KE} * 100$

substituting values

%-loss $= \frac{13314.83 - 5142.5}{13314.83} * 100$

%-loss $= 61.4$ %

The mass of Tarzan does not affect the speed because looking at this equation

$gh = \frac{1}{2} v_T^2$

We see that the velocity of Tarzan is not dependent on the mass of Tarzan

4 0

3 years ago