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kvasek [131]
3 years ago
11

A model engine accelerated forward from rest along a straight track at 10.0 m/s2 for 3.0 seconds. It then accelerates coward at

16 m/s2 for 5.0 seconds, and finally decelerates at 12 m/s2 until it stops. Calculate how many seconds was the engine moving ?
Physics
1 answer:
Mrac [35]3 years ago
4 0

Answer:

17.2 seconds

Explanation:

Given:

v₀ = 0 m/s

a₁ = 10.0 m/s²

t₁ = 3.0 s

a₂ = 16 m/s²

t₂ = 5.0 s

a₃ = -12 m/s²

v₃ = 0 m/s

Find: t

First, find v₁:

v₁ = a₁t₁ + v₀

v₁ = (10.0 m/s²) (3.0 s) + (0 m/s)

v₁ = 30 m/s

Next, find v₂:

v₂ = a₂t₂ + v₁

v₂ = (16 m/s²) (5.0 s) + (30 m/s)

v₂ = 110 m/s

Finally, find t₃:

v₃ = a₃t₃ + v₂

(0 m/s) = (-12 m/s²) t₃ + (110 m/s)

t₃ = 9.2 s

The total time is:

t = t₁ + t₂ + t₃

t = 3.0 s + 5.0 s + 9.2 s

t = 17.2 s

Round as needed.

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Answer:

B. 1500 kg*m/s

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3 0
3 years ago
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The  gravitational force exerted by the earth on a person standing on the earth's surface is 602.74 N.

<h3>What is the gravitational force of the earth on the person?</h3>

The gravitational force exerted by the earth on a person standing on the earth's surface is given below as follows:

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14. The design for a rotating spacecraft below consists of two rings. The outer ring with a radius of 30 m holds the living quar
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The outer ring with a radius of 30 m

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Centripetal acceleration enables Rotation therefore?

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Considering the outer ring,

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A Young's interference experiment is performed with blue-green laser light. The separation between the slits is 0.500 mm, and th
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Answer:

λ = 5.2 x 10⁻⁷ m = 520 nm

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From Young's Double Slit Experiment, we know the following formula for the distance between consecutive bright fringes:

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Therefore,

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