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adelina 88 [10]
3 years ago
9

A spaceship is travelling at 20,000.0 m/s. After 5.0 seconds, the rocket thrusters are turned on. At the 55.0 second mark, the s

hip has a velocity of 24,000.0 m/s. What is the acceleration of the rocket?
Physics
1 answer:
tankabanditka [31]3 years ago
7 0

Answer:

80 m/s^2

Explanation:

The acceleration of an object is given by:

a=\frac{v-u}{t}

where

v is the final velocity

u is the initial velocity

t is the time interval it takes for the velocity to change from u to v

For the rocket in this problem,

u = 20,000 m/s

v = 24,000 m/s

t = 55.0 - 5.0 = 50.0 s

Substituting,

a=\frac{24000-20000}{50}=80 m/s^2

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An iron railroad rail is 700 ft long when the temperature is 30°C. What is its length when the temperature is – 10°C?
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Answer:

699.67ft

Explanation:

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  • α = 1.2×10⁻⁵ / °C
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Now, We have to find ΔL:

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Rounded to two significant figures, the change in length is −0.33ft.

<u>Therefore, the final length is approximately 700 ft − 0.33 ft = 699.67ft</u>.

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