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Sphinxa [80]
3 years ago
6

I dont understand??????????????

Physics
1 answer:
Strike441 [17]3 years ago
7 0

The sum of the two vectors in A, B, and C is equal to the sum of the two vectors above the line.  The sum of the two vectors in D isn't.

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A 2.1W iPod is used for 30 minutes. How much energy does it use? (3
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You find it takes 200 N of horizontal force tomove an unloaded pickup truck along a level road at a speed of2.4 m/s. You then lo
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ANSWER:

F(h)= 230 N is the horizontal force you will need to move the pickup along the same road at the same speed.

STEP-BY-STEP EXPLANATION:

F(h) is Horizontal Force = 200 N

V is Speed = 2.4 m/s

The total weight increase by 42%

coefficient of rolling friction decrease by 19%

Since the velocity is constant so acceleration is zero; a=0

Now the horizontal force required to move the pickup is equal to the frictional force.

F(h) = F(f)

F(h) = mg* u

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g is gravitational acceleration = 9.8 m/s^2

200 = mg*u

Since weight increases by 42% and friction coefficient decreases by 19%

New weight = 1+0.42 = 1.42 = (1.42*m*g)

New friction coefficient = μ = 1 - 0.19 = 0.81 = 0.81 u

F(h) = (0.81μ) (1.42 m g)

       = (0.81) (1.42) (μ m g)

       = (0.81) (1.42) (200)

       = 230 N

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3 years ago
An object is stopped at point ‘a’, and travels to point ‘c’ in 8s. What was its acceleration?
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