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Elenna [48]
3 years ago
5

Which of the following describes work?

Physics
2 answers:
valentinak56 [21]3 years ago
7 0
I believe the correct answer from the choices listed above is option C. Work is when f<span>orce acts on an object and causes a displacement of that object. Work is calculated by multiplying force applied on an object and the distance it traveled. Hope this answers the question.</span>
olga2289 [7]3 years ago
4 0
C. Force causes displacement
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A cylindrical rod 21.5 cm long with a mass of 1.20 kg and a radius of 1.50 cm has a ball of diameter of 6.90 cm and a mass of 2.
Sergeeva-Olga [200]

Answer

given,

length of rod = 21.5 cm = 0.215 m

mass of rod (m) = 1.2 Kg

radius, r  = 1.50

mass of ball, M = 2 Kg

radius of ball, r = 6.90/2 = 3.45 cm = 0.0345 m

considering the rod is thin

I = \dfrac{1}{3}M_{rod}L^2 + [\dfrac{2}{5}M_{ball}R^2+M_{ball}(R+L)^2]

I = \dfrac{1}{3}\times 1.2 \times 0.215^2 + [\dfrac{2}{5}\times 2 \times 0.0345^2+2\times (0.0345 +0.215)^2]

     I = 0.144 kg.m²

rotational kinetic energy of the rod is equal to

KE = M_{rod}g\dfrac{L}{2} + M_{ball}g(L+R)^2

KE = 1.2 \times 9.8 \times \dfrac{0.215}{2} + 2\times 9.8\times (0.215+0.0345)^2

  KE = 6.15 J

b) using conservation of energy

   K_f + U_f = K_i + U_i + \Delta E

   \dfrac{1}{2}I\omega^2+ 0=0 + 6.15+0

   \dfrac{1}{2}\times 0.144 \times \omega^2= 6.15

    ω = 9.25 rad/s

c) linear speed of the ball

     v  =  r ω

     v  =  (L+R )ω

     v  =  (0.215+0.0345) x 9.25

     v =2.31 m/s

d) using equation of motion

  v² = u² + 2 g h

  v² = 0 + 2 x 9.8 x 0.248

   v = √4.86

  v =2.20 m/s

speed attained by the swing is more than free fall

  % greater = \dfrac{2.31-2.20}{2.20}\times 100

                   = 5 %

speed of swing is 5 % more than free fall

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A. 4% you divide 2000 to 500 and you get 4 which is your answer
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A student throws a heavy red ball horizontally from a balcony of a tall building with an initial speed v0. At the same time, a s
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Without air resistance, both balls reach the ground at the same instant.

Neither horizontal motion nor weight affects vertical motion.

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On the map red bands represent the earthquake
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How does a blue object look under all colors of light
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The "blue" object would look the same. Say that this blue object is a square. That "square" is every color but blue. The only reason that you see it as "blue" is because what we call "blue", it the only color of light that bounces back at our eyes. Under all colors of light, especially simultaneously. This square or any shape for that matter would absorb the other colors of light, but the blue will be rejected. Therefore, we can only see what bounces back at our eyes, which is the color blue in this case. 

Hope this helps, WyattMarine501
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