Physics
Modem is used mostly for ?

All listed here
Mostly for file system
A modern empty memory modules
Connecting to internet

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Physics
Should cars have bumpers that collapse under impact?

No, since it would be very expensive to get the car repaired
Yes, since the offending car should get damaged and pay for the mistake
No, since the colliding car would then ram into the occupants and kill them
Yes, since they help to absorb the impact of a collision and keep the occupants safe

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Physics
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust is a good conductor of heat.
Saw dust will not get melted easily.
Saw dust does not stick to the ice.

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