Mechanics need to get facts straight

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Homework Help Overview

The discussion revolves around mechanics, specifically the forces acting on a block on an incline and the concept of resistance in wires, along with a question about the properties of waves. Participants are attempting to clarify the forces involved in the scenario of a block on an incline and the effects of temperature on wire resistance.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are discussing the forces acting on a block on an incline, including the normal force, gravitational components, and friction. There is also a question regarding the formula for resistance in relation to temperature changes and an inquiry about whether diffraction is a property of all waves.

Discussion Status

Some participants are providing clarifications and corrections regarding the forces acting on the block, while others are raising additional questions about related topics. The discussion appears to be ongoing with multiple lines of inquiry being explored.

Contextual Notes

There are indications of confusion regarding the initial statements about forces, and some participants are questioning the accuracy of the information presented. Additionally, there is a suggestion that some questions could be answered through research, implying a need for independent verification of concepts discussed.

UrbanXrisis
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Need to get some facts straight.

A block on an incline with an angle of X...
the normal force is mg
the force parallel to the incline is mgSinX
the force perpendicular to the incline is mgCosX
and the force done against friction is mgCosX?
 
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Need to get some facts straight.

A block on an incline with an angle of X...
the normal force is mg
the force parallel to the incline is mgSinX
the force perpendicular to the incline is mgCosX
and the force done against friction is mgCosX?
Little of what you put made sense, but I'll tell you what I can.

A block of mass [itex]m[/itex] initially at rest on an incline of angle [itex]\theta[/itex] with coefficient of static friction [itex]\mu[/itex] has:

Force of gravity straight down into the plane, with magnitude [itex]mg[/itex].
Component of force of gravity perpendicular to and into the plane, with magnitude [itex]mg\cos \theta[/itex].
Normal force, [itex]F_N[/itex], counterbalancing that previous force, perpendicular to and out of the plane, with magnitude [itex]mg\cos \theta[/itex].
Component of force of gravity parallel to and down the plane, with magnitude [itex]mg\sin \theta[/itex].
Force of friction parallel to and up the plane of magnitude [itex]\mu F_N = \mu mg\cos \theta[/itex].
 
okay, what is the formula for resistance of a wire that includes change in temperature?
 
UrbanXrisis said:
okay, what is the formula for resistance of a wire that includes change in temperature?
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html
 
Is diffraction a property of all waves?
 
These rapid fire questions you are asking can all be researched within a matter of miliseconds, either by glancing at your text, or google.
 

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