2 years ago

if a car is taken from the garage driven for 100km before returning to the garage after 2 hours what is it average speed?

Physics

1 answer:

brilliants [131]2 years ago

8 0

Answer:

50km/h

Explanation:

Average Speed = Distance/Time

100km/2h = 50km/h

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A.) If its booster rockets accelerate the space shuttle at 15m/s2, how high will it be one minute after launch?

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Answer:

27,000 m

450 m/s

Explanation:

Assuming the initial velocity is 0 m/s:

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An extension cord is used with an electric weed trimmer that has a resistance of 17.9 Ω. The extension cord is made of copper (r

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Answer:

(a) $R_{c}=0.87ohms$

(b) $V_{T}=114.44V$

Explanation:

Part (a)

The total length of copper cord L=86.3 m

The cross sectional area A=1.71×10⁻⁶m²

The resistivity of copper p=1.72×10⁻⁸Ω

Thus the resistance of extension cord is

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Part (b)

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When voltage of 120V is applied then the current I is passing through series circuit is

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Thus the voltage across the trimmer is:

$V_{T}=IR_{T}\\V_{T}=(6.4)*(17.9)\\V_{T}=114.44V$

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