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umka2103 [35]
4 years ago
6

Mechanical advantage describe how simple machines?

Physics
2 answers:
7nadin3 [17]4 years ago
6 0

Answer:C: multiply the input force

Explanation:

A lever is a simple machine consisting of a bar pivoted or supported at a point (known as Fulcrum) about which it can rotate to perform the task.

Mechanical Advantage MA = \frac{E}{L}=\frac{F_{L}}{F_{E}}

where E→ length of effort arm from the pivot

         L→ length of load arm from the pivot

         F_{E}→ force on the end of effort arm

         F_{L}→ force on the end of load arm

<u>By the law of conservation of angular momentum:-</u>

F_{E}\times E=F_{L}\times L

sineoko [7]4 years ago
4 0

answer would be C. multiply the input force.

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An artist working on a piece of metal in his forging studio plunges the hot metal into oil in order to harden it. The metal piec
lutik1710 [3]

Answer:

The temperature of the metal is  T_m  =  376.8 ^o C

Explanation:

From the question we are told that

     The mass of the metal is  M =  60 \ kg

     The specific heat of the metal is  c_p  =  0.1027 kcal/(kg \cdot ^oC)

       The mass of the oil is M_o  =  810 \ kg

       The temperature of the oil is  T_o  =  35^oC

       The specific heat of oil is  c_o  =  0.7167 kcal/(kg \cdot ^oC )

       The equilibrium temperature is T_e  =  39 ^oC

According to the law of energy conservation

     Heat lost by metal  =  heat gained by the oil

So  

   The quantity  of heat lost by the metal is mathematically represented as

               Q =  - Mc_p \Delta T

=>            Q =  -Mc_p (T_m  -  T_c)

Where T_ m  the temperature of metal before immersion

The negative sign show heat lost

The quantity  of gained t by the metal is mathematically represented as      

           Q =  M_o c_o \Delta T

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So  

         Mc_p (T_m  -  T_c)   =   M_o c_o (T_c - T_o)

substituting values

          - 60 * 0.1027 (T_m  - 39)   =   810 * 0.7167 *  (39 - 35)

=>       T_m  =  376.8 ^o C

         

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3 years ago
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How can groundwater flow, elevation can transport contaminates
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(ii) Calculate the force required to accelerate a mass of 60 kg at 2.5m/s2<br> force =<br> [2]
ikadub [295]

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