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3 years ago

how far will a freely falling object have fallen from a position of rest when its instantaneous speed is 10m/s ?

Physics

1 answer:

Andreyy893 years ago

7 0

<u>Answer:</u>

A freely falling object have fallen from a position of rest when its instantaneous speed is 10 m/s, it will travel 5.102 meter.

<u>Explanation:</u>

We have equation of motion, $v^2=u^2+2as$ , where u is the initial velocity, u is the final velocity, s is the displacement and a is the acceleration.

In this case we have final velocity = 10 m/s, initial velocity = 0 m/s, and acceleration = 9.8 $m/s^2$ .

Substituting

$10^2=0^2+2*9.8*s\\ \\ s=5.102 meter$

A freely falling object have fallen from a position of rest when its instantaneous speed is 10 m/s, it will travel 5.102 meter.

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A ball is dropped from the top of a building.After 2 seconds, it’s velocity is measured to be 19.6 m/s. Calculate the accelerati

zlopas [31]

Answer:

acceleration, a = 9.8 m/s²

Explanation:

'A ball is dropped from the top of a building' indicates that the initial velocity of the ball is zero.

u = 0 m/s

After 2 seconds, velocity of the ball is 19.6 m/s.

t = 2s, v = 19.6 m/s

Using

v = u + at

19.6 = 0 + 2a

a = 9.8 m/s²

6 0

4 years ago

Read 2 more answers

Which of the following equations should be used to find the minimum thickness t of the oil film that satisfies the conditions of

Sergeeva-Olga [200]

Answer:

The equations are:

C. 2t=(m+12)λn(m=0,1,2,...) for constructive interference. (Here is a mistake in this equation i.e. m + 12 (wrong) and m + 1/2 (correct)). So, the correct equation for constructive interference is:

2t = (m + 1/2) λ n (m=0,1,2,...)

D. 2t=mλn(m=0,1,2,...) for destructive interference.

Explanation:

Constructive Interference occurs when two waves’ crests or troughs add together therefore, the resulting wave amplitude is equal to the sum of the each wave amplitude (in this case the amplitude of each wave is of same charge).

Destructive Interference occurs when a waves’ crest and trough cancel each other therefore, the resulting wave amplitude is zero (in this case the amplitude of each wave is oppositely charged).

When the refractive index of the medium in which the light travels is lower than the refractive index of the thin film medium then a 180° phase shift occurs.

When the light wave strikes the top surface of thin film, the wave reflects from the top surface and the reflecting light wave shifts by half of wavelength i.e. λ/2

When the light wave strikes the bottom surface of thin film then the light wave does not shift however, the light cover extra distance (2t), reflecting from the bottom surface to travel back to air.

Since, oil has refractive index (n = 1.5) which is higher than the refractive index of air (n = 1) so, when light wave strikes on the top surface of thin film of oil, the reflecting wave will shift by λ/2 (because nair < noil) and when light wave strikes on the bottom surface of thin film of oil, it will cover an extra distance to travel back to air and no wavelength shift will occur (because noil > nair).

In light of the above situation, the constructive interference of light reflected from the thin oil film is:

2t = (m + 1/2) λ n

The destructive interference of light reflected from the thin film is:

2t = m λ n

3 0

4 years ago

When an 80.0-kg man stands on a pogo stick, the spring is compressed 0.120 m. (a) What is the force constant of the spring? (b)

Nimfa-mama [501]

Answer:

a.6533.333 N/m

b.Yes,the spring will be compressed more when the person hops down the road .

Explanation:

Mass of man=80 kg

Spring compressed by x=0.12 m

a.We have to find the force constant of the spring.

Spring constant= $k=\frac{F}{x}=\frac{mg}{x}$

$g=9.8m/s^2$

Using the formula

Spring constant, $k=\frac{80\times 9.8}{0.12}$ N/m

Spring constant= $k=6533.33 N/s$

b.The spring will be compressed more when the person hops down the road because when the person hops down then the kinetic energy of person will be converted into potential energy during the road hit.

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3 years ago

Part 1 :

dybincka [34]

Answer:

1. 218.55 N

2. $30.96^{o}$