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4 years ago

Why is it when a ballerina stands on her toes she exerts more pressure than an elephant on all fours

1 answer:

7 0

I'm not sure that's true ... we'd need to see some numbers.
But if it is true, it's the same reason why some places don't
want ladies to walk on their floors with high heels.

Pressure is (weight) divided by (area).

Pressure exerted
by a ballerina = (ballerina's weight)/(area of her toe on the floor)

Pressure exerted
by an elephant = (elephant's weight)/(area of 4 elephant feet)

Pressure exerted by
a lady in high heels = (lady's weight) / (area of 1 or 2 heels)

You can see that the greatest weight might not exert the greatest
pressure, and the smallest weight might not exert the smallest
pressure. The area is important, and it takes an awful lot of toes
or high heels to equal the area of one or more elephant's feet.

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What kind of energy is called mechanical energy?

Fittoniya [83]

Answer:

can be called kinetic or potential energy

Explanation:

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3 years ago

A crate is pulled to the right with a force of 85 N, to the left with a force of 115 N, upward with a force of 565 N, and downwa

balandron [24]

Answer:

330.4 N and $95.2^{\circ}$ counterclocwise to the x direction

Explanation:

Sum of forces in vertical are equal, let movement to right and upwards be positive while left and downwards be negative

Net force in horizontal direction is 85-115=-30 N

Net force in vertical direction is 565-236=329 N

Resultant force= $\sqrt {(-30)^{2}+329^{2}}=330.3649497 N\approx 330.4 N$

Direction= $tan^{-1}\frac {329}{-30}=-84.78986932\approx -84.8^{\circ}$

180-84.8=95.2

Therefore, direction is $95.2^{\circ}$ counterclocwise to the x direction

3 0

4 years ago

A bicyclist travels 4.5 km west, then travels 6.7 km at an angle 27.0 degrees South of West. What is the magnitude of the bicycl

Dimas [21]

Answer:

10.90km

Explanation:

Magnitude of the total displacement is expressed using the equation

d = √dx²+dy²

dx is the horizontal component of the displacement

dy is the vertical component of the displacement

dy = -6.7sin27°

dy = -6.7(0.4539)

dy = -3.042

For the horizontal component of the displacement

dx = -4.5 - 6.7cos27

dx = -4.5 -5.9697

dx = -10.4697

Get the magnitude of the bicyclist's total displacement

Recall that: d = √dx²+dy²

d = √(-3.042)²+(-10.4697)²

d = √9.2538+109.6146

d = √118.8684

d = 10.90km

Hence the magnitude of the bicyclist's total displacement is 10.90km

6 0

3 years ago

All of the following except ______ were part of RCA. A. Westinghouse B. Columbia Broadcasting System C. United Fruit Company D.

PSYCHO15rus [73]

Answer:

Columbia broadcasting system was never been a part of RCA corporation. The other companies Westinghouse, united fruit company and general electric were remain as part of RCA.

Explanation:

7 0

3 years ago

If a light ray from a candle strikes a mirror at an angle of 40° with the normal, at what angle will the ray reflect?. Select on

tekilochka [14]

Answer: The correct answer is option (C).

Explanation:

Law of reflection:

Angle of incident is equal to angle of reflection;∠i=∠r
Incident ray, reflected ray and normal to the reflecting interface at the point of incidence all lie in same plane.

When light ray from candle strikes a mirror at an angle of 40° with the normal, then the angle at which ray reflected back will 40°.

6 0

4 years ago

Read 2 more answers