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3 years ago

A package dropped from an airplane reaches a velocity of 117.72 m/s in how many seconds? (Show all work)

2 answers:

4 0

In order to work on this one, we have to ignore air resistance.
If we include the effects of air resistance in our calculation, we would need
a ton of information that's not given in the question, and we would need an
Aeronautical Engineer to know how to use it all.

Ignoring air resistance . . .

Gravity adds 9.81 m/s to the downward speed of a falling object.

If the object is "dropped", then it's original speed is zero.

It reaches 117.72 m/s in

(117.72 m/s) / (9.81 m/s²) = 12.00 seconds

Genrish500 [490]3 years ago

3 0

12 seconds
$12 \\$

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There is a reflection at the boundary between two materials if there is a change of __________ at the boundary.

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Which of the following helps to explain how hydraulic lifts work?

Gnesinka [82]

Answer : C. Pascal's principle.

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The balance between incoming solar energy and out going energy radiated into space is called...

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3 years ago

Calculate the pressure exerted on the heel of a boy’s foot if the boy weighs 80 N and he lands on one heel,which has an area of

cricket20 [7]

Pressure at a given surface is given as ratio of normal force and area

so here force due to heel of the shoes is given as 80 N

and the area of the heel is given as 16 cm^2

so we can say

$P = \frac{F}{A}$

here we have

F = 80 N

$A = 16 cm^2 = 16 * 10^{-4} m^2$

$P = \frac{80}{16 * 10^{-4}}$

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3 years ago

An ambulance emits a frequency of 450 Hz from its siren. What frequency is heard by a man as the ambulance moves toward him? les

Zepler [3.9K]

Frequency is defined as the number of repetitions of waves occurring in 1 second. The frequency heard by the man as the ambulance move toward him will be greater than 450 Hz.

<h3>What is the frequency ?</h3>

Frequency is defined as the number of cycles completed in 1 second. Frequency is given by the formula as,

$\rm{Frequency =\frac{1}{time } }$

As the formula shows frequency is inversely proportional to the time that shows if the time is decreasing frequency will increase and vice versa.

In the above case, the ambulance is moving toward the men. So that the time to meet up is decreased that's why the frequency will be greater than the initial frequency from the siren.

Hence the frequency heard by the man as the ambulance move toward him will be greater than 450 Hz.

To learn more about frequency refer to the link ;

brainly.com/question/4393505

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