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Mademuasel [1]
3 years ago
15

A girl runs 40m due south in 40 seconds an d then 20m due north in 10 secondsCalculate.

Physics
1 answer:
m_a_m_a [10]3 years ago
3 0

Answer:

Average speed = 1.2 m/s

Average velocity = 0.4 m/s

Explanation:

Average speed = total distance/total time

Average speed = (40 + 20)/(40 + 10)

Average speed = 60/50

Average speed = 1.2 m/s

Average velocity = displacement/time

Now, she ran 40 m south and ran 20 m back north which is in the direction of where she began the journey.

Thus;

Displacement = 40 - 20 = 20 m

Average velocity = 20/50 = 0.4 m/s

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Answer:

Tangential speed = R * w  where w is the angular speed

For a wheel   v = .114 m * 6.53 / sec = .744 m/s

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top V + v

bottom   V - v

That is the wheel also has speed due to the speed of the axle (axis of rotation)

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3 years ago
Atoms of two different elements must have different
Tresset [83]

Answer:

Number of neautrons

Explanation:

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3 years ago
What is the frequency of radiation whose wavelength is 2.40 x 10-5 cm?
S_A_V [24]
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John accidentally drops his keys off the balcony at his apartment. John's friend Tony just happens to walk by at that moment and
EleoNora [17]

Explanation:

In order to find out if the keys will reach John or not, we can use the formula of projectile motion to find the maximum height reached by the keys:

H = V²Sin²θ/2g

where,

V = Launch Speed = 18 m/s

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Therefore,

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H = 6.83 m

Hence, the maximum height that can be reached by the projectile or the keys is greater than the height of John's Balcony(5.33 m).

Therefore, the keys will make it back to John.

7 0
3 years ago
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