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3 years ago

14

a car company claims that its car can accelerate from rest to a speed of 28.0 m/s in 20.0 s. find the average acceleration of th

e car

1 answer:

elixir [45]3 years ago

5 0

tje average acceleration of the car is

$\frac{28}{20} = 1.4$

the average acceleration of the car is 1.4 m/s

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A long ramp made of cast iron is sloped at a constant angle θ = 52.0∘ above the horizontal. Small blocks, each with mass 0.42 kg

dezoksy [38]

Answer:

For cast iron we have

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For copper

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As we know that final speed of the block is calculated by work energy theorem

$W_f + W_g = \frac{1}{2}mv^2$

now we have

$-\mu_k mg cos\theta(\frac{h}{sin\theta}) + mgh = \frac{1}{2}mv^2$

now we have

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$4 = \sqrt{2(9.81)(h)(1 - 0.15cot52)}$

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For copper

$4 = \sqrt{2(9.81)(h)(1 - 0.29cot52)}$

$h = 1.05 m$

For Lead

$4 = \sqrt{2(9.81)(h)(1 - 0.43cot52)}$

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For Zinc

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$h = 2.43 m$

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