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Natalka [10]
3 years ago
8

An airplane heads northeast at an airspeed of 700 km/hr, but there is a wind blowing from the west at 60 km/hr. In what directio

n does the plane end up flying? What is its speed relative to the ground?
Physics
1 answer:
sweet [91]3 years ago
8 0
Tan x = 60/700
x = 4.9 degree east north

v = √(60^2  + 700^2)
v = 702.6 kph

hope this helps
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The kinetic friction force between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25
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Answer:

375 m.

Explanation:

From the question,

Work done by the frictional force = Kinetic energy of the object

F×d = 1/2m(v²-u²)..................... Equation 1

Where F = Force of friction, d = distance it slide before coming to rest, m = mass of the object, u = initial speed of the object, v = final speed of the object.

Make d the subject of the equation.

d = 1/2m(v²-u²)/F.................. Equation 2

Given: m = 60.0 kg, v = 0 m/s(coming to rest), u = 25 m/s, F = -50 N.

Note: If is negative because it tends to oppose the motion of the object.

Substitute into equation 2

d = 1/2(60)(0²-25²)/-50

d = 30(-625)/-50

d = -18750/-50

d = 375 m.

Hence the it will slide before coming to rest = 375 m

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3 years ago
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alexgriva [62]
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3 years ago
the minimum flying speee for a bird called a house martin is 9.0ms^-1. it reaches this speed by falling from its nest before swo
Lilit [14]

Answer:

The nest must be about  4.15 meters above ground

Explanation:

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v_f=v_i+a\,*\,t

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v_f=v_i+a\,*\,t\\9=0+9.8\,t\\t=\frac{9}{9.8} \, sec\\t \approx 0.92\,\, sec

We now use this time value to find the distance covered in free fall during 0.92 seconds:

d=\frac{1}{2} \,9.8 \,t^2=4.9\,(0.92)^2=4.147 \,meters\approx 4.15\,meters

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Answer:

increase

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\huge \rm༆ Answer ༄

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