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Serjik [45]
3 years ago
5

An airplane is moving at a speed of 75m/s as it lands on a runway. if the runway is 500 m long what is the acceleration of the p

lane as it slows to a stop
Physics
1 answer:
Ipatiy [6.2K]3 years ago
5 0

Answer:

-5.625 m/s^2

Explanation:

Use the kinematic equation v_{f}^{2} = v_{o}^{2} + 2ad

Substitute the values and solve for a.

0^2 = 75^2 + a 2 (500)

0 = 5625 + 1000a

-5625 = 1000a

-5.625 = a

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kati45 [8]

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4 years ago
A quarterback throws releases a 400. g football 1.2 meters off of the ground with a speed of 25 m/s. Determine the total energy
Usimov [2.4K]
Kinetic energy is an expression of the fact that a moving object can do work on anything it hits; it quantifies the amount of work the object could do as a result of its motion. And potential energy <span>is the </span>energy<span> that is stored in an object due to its position relative to some zero position. </span><span> We calculate as follows:

KE + PE = mv^2 / 2 + mgh 
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3 years ago
Determine the magnitude of the resultant force acting on a 5 −kg particle at the instant t=2 s, if the particle is moving along
Alex787 [66]

Answer:

F = 296.7N

Explanation:

The x and y component of the position vector are given by:

x(t) =rcos\phi, y(t) = rsin\phi\\ \frac{dx}{dt} =\frac{dr}{dt} cos\phi - rsin\phi\frac{d\phi}{dt} , \frac{dy}{dt}=\frac{dr}{dt}sin\phi + rcos\phi\frac{d\phi}{dt}\\ \frac{d^2x}{dt^2} = \frac{d^2r}{dt^2} cos\phi - \frac{dr}{dt} sin\phi\frac{d\phi}{dt} -\frac{dr}{dt} sin\phi\frac{d\phi}{dt} - r(cos\phi\frac{d^2\phi}{dt^2} + sin\phi\frac{d^2\phi}{dt^2})

\frac{d^2y}{dt^2} = \frac{d^2r}{dt^2} sin\phi + \frac{dr}{dt} cos\phi\frac{d\phi}{dt}+\frac{dr}{dt}cos\phi\frac{d\phi}{dt}+r(-sin\phi\frac{d^2\phi}{dt^2} +cos\phi\frac{d^2\phi}{dt^2})

At t = 2s:

\phi(2) = 1.5t^2-6t= -6\\ \frac{d\phi}{dt}(2) = 3t-6=0\\ \frac{d^2\phi}{dt^2}=3\\r(2)=2t+10=14\\ \frac{dr}{dt}=2\\\frac{d^2r}{dt^2} = 0

Plugging in:

\frac{d^2x}{dt^2}=-42(cos(-6) + sin(-6))=-52\frac{m}{s^2} \\\frac{d^2y}{dt^2} = 42(cos(-6)-sin(-6))=28.6\frac{m}{s^2}

The resulting force F is:

F = m\sqrt{(\frac{d^2x}{dt^2})^2 + (\frac{d^2y}{dt^2})^2}=296.7N

5 0
3 years ago
Pablo is asked to think about his favorite birthday party, and he pictures a cake with candles and frosting and he can even reme
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The correct answer is B. Analogical
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4 years ago
A squirrel jumps down from a tall tree. Assuming the squirrel is in free fall, how far will it have fallen in 1.5 seconds?
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D = 1/2gt^2 <-- free fall formula

d = (0.5)(9.81)(1.5^2)
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d = 11.04 m

hope this helps and have a great day :)




7 0
3 years ago
Read 2 more answers
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