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aksik [14]
2 years ago
8

An object is moving east, and its velocity changes from 66 mvs to 26 mvs in 10 seconds. Which describes the

Physics
1 answer:
STALIN [3.7K]2 years ago
6 0

Answer:

negative acceleration of 4m/s²

Explanation:

Given parameters:

Initial velocity  = 66m/s

Final velocity = 26m/s

Time taken = 10s

Unknown:

Description of the acceleration  = ?

Solution:

Acceleration is the rate of change of velocity with time.

It is mathematically expressed as;

    acceleration  = \frac{v - u}{t}

v is the final velocity

u is the initial velocity

t is the time taken

  Now insert the parameters and solve;

    Acceleration  = \frac{26 - 66}{10}   = -4m/s²

So, we see a negative acceleration of 4m/s²

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Describe the phenomenon of lightning?​
masha68 [24]

Lightning is a naturally occurring electrostatic discharge during which two electrically charged regions in the atmosphere or ground temporarily equalize themselves, causing the instantaneous release of as much as one gigajoule of energy.
3 0
3 years ago
What is matter made of ?​
Evgen [1.6K]

Answer:

Matter is made up of atoms.

4 0
2 years ago
What is kinetic energy of an object that is not in motion
Rus_ich [418]
There is no kinetic energy.
Kinetic energy = 1/2(m)v^2
There is no velocity; therefore, there is no kinetic energy.
6 0
2 years ago
a proton travelling along is x-axis is lowed by a niform electric field E. at x = 20.0 cm, the proton has a speed of 3.5x10^6 m/
anzhelika [568]

Answer:

Magnitude of electric field is 1.06 x 10^5 V/m along negative X-direction

Explanation:

Given: initial velocity of proton = u = 3.5 x 10^6 m/s

final velocity of proton = v = 0 m/s

initial point l_i = 0.2 m and final point is l_f = 0.8 m

According to conservation of energy:

change in in kinetic energy = change in potential energy of proton

⇒\frac{m}{2}(v^2-u^2 ) = qE(l_i - l_f)

where q and m is the charge and mass of proton E is the electric field , l_i and l_f is the initial and final position of proton

on substituting the respected values we get,

1.023 x 10^-^1^4 = 9.6 x 10^-^2^0 x E

⇒ E = 1.06 x 10^5 V/m

external force is opposite to the motion as velocity of proton decreases with distance.

Therefore, magnitude of electric field is 1.06 x 10^5 V/m along negative X-direction

5 0
2 years ago
A woman drops a vibrating tuning fork, which is vibrating at 513 Hertz, from a tall building. Through what distance (in m) has t
umka21 [38]

Answer:

h = 15.34 m

Explanation:

given,

tuning fork vibration = 513 Hz

speed of sound = 343 m/s

frequency after deflection = 489 Hz

the source (the fork) moves away from the observer, its speed increases and hence the apparent frequency decreases

f_{apparent} = \dfrac{v}{v+u}f_0

489 = \dfrac{343}{343+u}\times 513

0.953 = \dfrac{343}{343+u}

343+u = \dfrac{343}{0.953}

343+u = 359.92

u = 16.92 m/s

height of the building

v² = u² + 2 g s

16.92² = 2 x 9.8 x h

h = 14.61 m

time taken by sound to reach observer

t = \dfrac{14.61}{343}

t =0.0426\ s

in this time tuning fork has fallen one more now,

h' = u t + \dfrac{1}{2}gt^2

h' = 16.92\times 0.0426 + \dfrac{1}{2}\times 9.8 \times 0.0426^2

h' = 0.7296 m = 0.73 m

total distance

      h = 14.61 + 0.73

      h = 15.34 m

6 0
3 years ago
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