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Sloan [31]
3 years ago
7

which of the following statements is a reasonable conclusion about the Arctic ecosystem? a)The number of offspring produced is a

n abiotic limiting factor because it affects the number of prey that predators can eat. b)The number of predators is an abiotic limiting factor because it affects the number of consumers that can eat producers. c)Temperature is an abiotic limiting factor because it affects the amount of sea ice available for animals to live on. d)Sunlight is an abiotic limiting factor because it affects the number of producers available for other organisms to eat. Please please helpppp!
Physics
1 answer:
Vitek1552 [10]3 years ago
6 0

Answer:

A is the answer

Explanation:

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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

=>        Q =  M_o c_o (T_c - T_o)

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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If a ball is tossed straight up into the air, at what position is its potential energy the greatest?
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A. when it reaches the top of its flight

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Item 8
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