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xz_007 [3.2K]
2 years ago
15

A cyclist rides at 30 kilometres per hour. How far will he travel in 2 hours?

Physics
1 answer:
GarryVolchara [31]2 years ago
3 0

Answer:

a

Explanation:

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Explain why materials such as plastic foam, feathers, and fur are poor conductors of heat.
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One end of a 7-cm-long spring is attached to the ceiling. When a 5.4 kg mass is hung from the other end, the spring is stretched
mash [69]

Answer:

2.63 cm

Explanation:

Hooke's law gives that the force F is equal to cy where c is spring constant and x is extension

Making c the subject of the formula then

c=\frac {F}{y}

Since F is gm but taking the given mass to be F

c=\frac {5.4 kg}{4.3 cm}=1.2558139534883720930232558139534883720930

By substitution now considering F to be 3.3 kg

y=\frac {3.3 kg}{1.2558139534883720930232558139534883720930}=2.6277777777777 cm\approx 2.63 cm

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