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Evaluate the following expression if r = -7 and t = 4. r2 + t =
If r = -7 and t = 4, r^2 + t = 53 (-7)^2 + 4 = 49 + 4 = 53
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Asked 6/17/2009 10:12:15 AM
Updated 6/12/2014 6:52:45 PM
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If r = -7 and t = 4, r^2 + t = 53

(-7)^2 + 4 = 49 + 4 = 53
Added 6/12/2014 6:52:45 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [6/13/2014 2:04:35 AM]
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A major factor in the use of the inclined plane is
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Updated 147 days ago|9/29/2023 2:15:37 PM
1 Answer/Comment
A major factor in the use of the inclined plane is friction.

Added 147 days ago|9/29/2023 2:15:37 PM
This answer has been confirmed as correct and helpful.
A major factor in the use of the inclined plane is
Weegy: less force is need when some thing is needed to bring down. (More)
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Updated 10/6/2017 12:29:24 PM
1 Answer/Comment
A major factor in the use of the inclined plane is friction.
Added 10/6/2017 12:29:22 PM
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Evaluate the following expression if p = -2 and q = 5. p2q2=
Weegy: (More)
Question
Expert Answered
Updated 7/30/2014 9:14:39 PM
1 Answer/Comment
p^2q^2 if p = -2 and q = 5;

(-2)^2 * (5)^2

= 4 * 25

= 100
Added 7/30/2014 9:14:39 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [7/30/2014 9:17:35 PM]
For the data below, find the mode. 10 11 11 13 15 25 30 60
Question
Updated 8/15/2014 7:20:29 AM
3 Answers/Comments
Mode is number repeated the most so answer is 11.
Added 6/10/2009 6:32:01 PM
The mode is 11 as it is repeated more number of times.
Added 6/10/2009 8:53:23 PM
The mode of this set : 10 11 11 13 15 25 30 60 is 11.
Added 8/15/2014 7:20:29 AM
This answer has been confirmed as correct and helpful.
In a pulley system, a 5-newton weight is to be lifted 2 meters. The rope is pulled 10 meters. The effort force is two newtons. IMA = AMA = efficiency = % .
Weegy: IMA is a multiplier. Meaning it represents how much the machine will multiply the force which is put into it. It, therefore, has no unit and would be written like: 3. [ [ [ This means that whatever amount of work is put into the machine, you will get 3 times the work out. Effort will usually be a distance: cm, m Resistance will also usually be a distance although it needs to be the same unit as the effort so we compare apples to apples. :) ] ] ] User: In a pulley system, a 5-newton weight is to be lifted 2 meters. The rope is pulled 10 meters. The effort force is two newtons. IMA = AMA = efficiency = % (More)
Question
Expert Answered
Updated 238 days ago|6/30/2023 10:51:28 AM
1 Answer/Comment

To calculate the IMA (Ideal Mechanical Advantage) of a pulley system, we can use the formula:

IMA = (Distance the effort force moves) / (Distance the load moves)

In this case, the distance the effort force moves is 10 meters (as mentioned in the question), and the distance the load moves is 2 meters. Therefore, the IMA can be calculated as:

IMA = 10 / 2 = 5

The IMA represents the theoretical advantage of the pulley system.

The AMA (Actual Mechanical Advantage) of a pulley system takes into account factors such as friction and other losses. In an ideal pulley system without any losses, the AMA would be equal to the IMA. So, in this case, the AMA is also 5.

Efficiency is defined as the ratio of output work to input work, expressed as a percentage. In a pulley system, the output work is the work done on the load (weight lifted), and the input work is the work done by the effort force. Since the effort force is two newtons and the load is five newtons, the efficiency can be calculated as:

Efficiency = (Output work / Input work) * 100
= (5 / 2) * 100
= 250%

Therefore, the efficiency of the pulley system is 250%.
Added 238 days ago|6/30/2023 10:51:28 AM
This answer has been confirmed as correct and helpful.
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