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Luda [366]
3 years ago
6

Jackson throws a football 30 meters at a speed of 15 m/s. How long was the football in the air before Laurence caught it for tou

chdown
Physics
2 answers:
ch4aika [34]3 years ago
6 0

Answer:

2s

Explanation:

Given parameters:

Distance  = 30m

Speed  = 15m/s

Unknown:

Time before Laurence caught it = ?

Solution:

To solve this problem;

    Speed  = \frac{disance }{time}  

 Time taken  = \frac{distance }{speed }   = \frac{30}{15}  = 2s

The time it takes is 2s

Anton [14]3 years ago
5 0

<u>Given:</u>

  • <u>30 meters</u>
  • <u>Speed of 15 m/s</u>

<u>We will solve:</u>

<u>Speed  = </u>\frac{distance}{time}<u></u>

<u></u>

<u> Time taken  = </u>\frac{distance}{time} <u>= </u>\frac{30m}{15m/s} <u>= 2s</u>

<u></u>

<u>The time it takes is 2s</u>

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f' = \left (\dfrac{v + v_0}{v - v_s} \right) \times f

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f = Actual frequency of the wave

v = The velocity of the sound wave

v_o = The velocity of the observer

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f' = \left (\dfrac{v }{v - v_s} \right) \times f

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f' = \left (\dfrac{v }{v + v_s} \right) \times f

Therefore;

(a) A person left behind on the platform

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f' = \left (\dfrac{v }{v + v_s} \right) \times f

(1) Given that (v + v_s) > v, therefore, v < (v + v_s), f' < f, the frequency heard by the person left on the platform, f', is smaller (lower) than the frequency produced by the radio

(2) The frequency is not constant as the speed of the source is increasing while it under the acceleration due to gravity

(3) During the fall, the speed of the source continuously increases under the effect of gravitational attraction and therefore the frequency heard by the person on the platform becomes progressively smaller

(b) A person down below floating on a rubber raft

For the the person down below on the rubber raft, the radio source is advancing

Therefore, the radio source is moving towards the person at rest down on the rubber raft, therefore, we have;

f' = \left (\dfrac{v }{v - v_s} \right) \times f

(1) Given that (v - v_s) < v, therefore, f' > f, the frequency heard by the person down below floating on the rubber raft, f', is greater (higher) than the frequency produced by the radio

(2) The frequency is not constant as the speed of the source is increasing while it under the acceleration due to gravity

(3) During the fall, the speed of the source continuously increases under the effect of gravitational attraction and therefore the frequency heard by the person on the platform becomes progressively greater (higher)

Explanation:

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