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max2010maxim [7]

3 years ago

13

In which item is energy stored in the form of gravitational potential energy?

2 answers:

polet [3.4K]3 years ago

8 0

C, the first one is an inanimate object, it isn't hanging off a counter or anything, and the other two are examples of kinetic energy. Sorry if I'm wrong, this isn't my best field.

Anastasy [175]3 years ago

3 0

<span>Gravitational potential energy is the energy stored in an object as the result of its vertical position or height and only in Option C, object is in vertical position.

In short, Your Answer would be Option C

Hope this helps!</span>

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A railroad track and a road cross at right angles. An observer stands on the road and watches an eastbound train traveling at 60

mamaluj [8]

Answer:

After 4 s of passing through the intersection, the train travels with 57.6 m/s

Solution:

As per the question:

Suppose the distance to the south of the crossing watching the east bound train be x = 70 m

Also, the east bound travels as a function of time and can be given as:

y(t) = 60t

Now,

To calculate the speed, z(t) of the train as it passes through the intersection:

Since, the road cross at right angles, thus by Pythagoras theorem:

$z(t) = \sqrt{x^{2} + y(t)^{2}}$

$z(t) = \sqrt{70^{2} + 60t^{2}}$

Now, differentiate the above eqn w.r.t 't':

$\frac{dz(t)}{dt} = \frac{1}{2}.\frac{1}{sqrt{3600t^{2} + 4900}}\times 2t\times 3600$

$\frac{dz(t)}{dt} = \frac{1}{sqrt{3600t^{2} + 4900}}\times 3600t$

For t = 4 s:

$\frac{dz(4)}{dt} = \frac{1}{sqrt{3600\times 4^{2} + 4900}}\times 3600\times 4 = 57.6\ m/s$

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3 years ago

Hideki is having trouble completing long workouts. What does he need to improve?

KonstantinChe [14]

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How many ounces is 200 lbs converted

ddd [48]

Answer:

3,200 ounces

Explanation:

1 pound (lb) is equal to 16 ounces (oz):

i.e 1 lb = 16 oz

Given:

200 pounds

To find:

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200 (mass) * 16 = 3,200 ounces.

Thank you!

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Answer:

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