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During which period did the first true mammals appear? A. Permian B. Triassic C. Jurassic D. Cretaceous
Question
Updated 130 days ago|3/27/2015 5:35:33 AM
1 Answer/Comment
During the TRIASSIC period, the first true mammals appeared.
Added 130 days ago|3/27/2015 5:35:31 AM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by jeifunk [3/27/2015 5:42:24 AM]
What is the correct formula for power? Power = work * time Power = force * distance Power = work * distance Power = work / time
Question
Updated 23 days ago|7/11/2015 3:11:31 PM
1 Answer/Comment
The correct formula for power is:
Power = work / time
Added 23 days ago|7/11/2015 3:11:29 PM
This answer has been confirmed as correct, not copied, and helpful.
What is the correct formula for power? Power = force * distance Power = work * time Power = work / time Power = work * distance
Weegy: Hi there. The formula for power in watts is: Power = work/seconds. For electronics, power is calculated as: P = I2R, or P= V2/R, or P= VI , where P is power, I is current, R is resistance, and V is voltage. (More)
Question
Updated 4/6/2014 2:00:07 AM
1 Answer/Comment
The correct formula for power is Power = work / time
Added 4/6/2014 2:00:05 AM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by jeifunk [4/6/2014 3:18:41 AM]
Why are all machines NOT 100% efficient? A. mass B. gravity C. friction D. distance
Question
Not Answered
Updated 12/12/2013 11:30:50 PM
1 Answer/Comment
All machines NOT 100% efficient because of C. friction


The villain of all machines is friction.Even with the best lubricants, there still exists some friction between moving parts in any machine. This transforms some of the energy into heat, and thus prevents it from being used to achieve the purpose of the machine.


- See more at:

Added 12/12/2013 11:30:50 PM
Wedges are used to _____ things. A. separate B. accelerate C. slow down D. change the direction of
Question
Updated 167 days ago|2/17/2015 9:36:10 AM
1 Answer/Comment
Wedges are used to separate things.
Added 167 days ago|2/17/2015 9:36:09 AM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by Andrew. [2/17/2015 9:39:42 AM]
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