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katrin2010 [14]
3 years ago
15

An airplane dropped a flare from a height of 2860 feet above a lake. How many seconds did it take for the flare to reach the wat

er?
Physics
2 answers:
KATRIN_1 [288]3 years ago
8 0

Answer: 13.2 seconds.

Explanation: using equation of motion; S= ut +1/2at² where u = initial velocity=0

S= distance travelled

a = acceleration due gravity

t= time.

1 foot = 0.305m so,

S= 2860 feet =872.3m

S= ut+1/2 at²

872.3 = 0×t + 1/2×10 × t²

872.3 =0 + 5t²

T²= 872.3/5

T²= 174.46

Take the square root of T we then have;

t = 13.2 seconds to one decimal place.

QveST [7]3 years ago
7 0

Answer:

Aircraft crashed and sank into the water ~ 50 yards off shore, in 45 feet water, ... On his second flight, Charles reached an altitude of 2,700 metres (8,900 ft) ... carrying 16 personnel made an emergency landing on Lake Qadisiyah in Al ... The 777 will reach 500 airplanes delivered faster than any other twin-aisle airplane in ...

Explanation:

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kompoz [17]

Answer:

185.25 m/s

Explanation:

consider the motion of the combination of bullet and block after the collision

v₀ = initial speed just after the collision

v' = final speed = 0 m/s

μ = Coefficient of friction = 0.6

g = acceleration due to gravity = 9.8 m/s²

a = acceleration of the combination = - μ g = - (0.6) (9.8) = - 5.88 m/s²

d = stopping distance = 13 m

using the kinematics equation

v'² = v₀² + 2 a d

0² = v₀² + 2 (- 5.88) (13)

v₀ = 12.4 m/s

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M = mass of the wood = 138 g = 0.138 kg

v = speed of bullet before collision

v₀ = speed of combination after the collision = 12.4 m/s

Using conservation of momentum

m v = (m + M) v₀

(0.0099) v = (0.0099 + 0.138) (12.4)

v = 185.25 m/s

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3 years ago
I need help with my physics homework agh! Please help it's due tomorrow. <br>​
storchak [24]

Rubbing both pieces cause each piece to have a negative charge.

When two parts have the same they repel each other, so holding one piece up tot he end of the other piece would push it away.

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If they held the piece to the other end of the one held by a string it would start to rotate in the opposite direction.

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3 years ago
how does gravity affect objects of different mass close to earth, and how does that effect change as an object moves farther fro
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3 years ago
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Answer:

Explanation:

a = gsinθ

a = 9.8sin30

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