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enyata [817]
3 years ago
12

Can Someone explain the steps for this ?

Physics
2 answers:
telo118 [61]3 years ago
8 0
All you have to do is resolve the velocity into x and y components.
Now, since you have to determine the height of the window, only y component of velocity of the bag will affect its vertical motion.
Also, it just reaches the window which could only happen if its vertical component of final velocity becomes zero.
All you have to do is, use kinematic equation,

v^2 - u^2 = 2gh

v= final velocity(vertical component) = 0 m/s
u = initial velocity (vertical component)
g = acceleration due to gravity
h = height of the window from the ground

Plug all the given values to find h
NARA [144]3 years ago
3 0

Answer:

h = 10.0 m

Explanation:

As we know that the initial velocity of the bag is 16.2 m/s at an angle of 60 degree

so here we have

v_x = 16.2 cos60

v_x = 8.1 m/s

v_y = 16.2 sin60

v_y = 14.03 m/s

now we know that the bag just reaches the window so here at the point when bag reaches to the window its vertical speed must be zero

so we have

v_f^2 - v_i^2 = 2 a d

0 - (14.03)^2 = 2(-9.81)(h)

h = 10.0 m

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A 50.0-kg projectile is fired at an angle of 30 degrees above thehorizontal with an initial speed of 1.20 x 102 m/s fromthe top
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a)  Em₀ = 42.96 104 J , b)   W_{fr} = -2.49 105 J , c)  vf = 3.75 m / s

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b) The work of the friction force is equal to the change in the mechanical energy of the body

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     Em₂ = ½ m v₂² + m g y₂

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     W_{fr} = Em₂ -Em₀

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     W_{fr} = -2.49 105 J

The negative sign indicates that the work that force and displacement have opposite directions

c) In this case the work of the friction going up is already calculated in part b and the work of the friction going down would be 1.5 that job

We have that the work of friction is equal to the change of mechanical energy

       W_{fr} = ΔEm

       W_{fr} = Emf - Emo

       -1.5 2.49 10⁵ = ½ m vf² - 42.96 10⁴

       ½ m vf² = -1.5 2.49 10⁵ + 4.296 10⁵

       ½ 50.0 vf² = 0.561

       vf = √ 0.561 25

      vf = 3.75 m / s

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