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andriy [413]
3 years ago
10

Can some please help me

Physics
1 answer:
Brilliant_brown [7]3 years ago
3 0

Answer:

Classification

–  Drug (highly regulated)

§   A substance which changes body structure or function.

§   Stimulate hormone secretions

§   Looks like medicine and/or is administered differently than foods

–  Dietary Supplement (not highly regulated)

§   Highly refined products

§   No positive nutritional value

Explanation:

https://web.cortland.edu/buckenmeyerp/Lecture14.html

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A 0.42 kg shuffleboard disk is initially at rest when a player uses a cue to increase its speed to 4.2 m/s at constant accelerat
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Answer

given,

mass of the shuffleboard disk = 0.42 kg

speed of the cue is increased to = 4.2 m/s

acceleration takes over 2 m then acceleration is zero.

the disk additionally slide to 12 m

final speed of disk = 0 m/s

a) increase in thermal energy

\Delta E_t = \dfrac{1}{2}m(v_1^2-v_2^2)

\Delta E_t = \dfrac{1}{2}\times 0.42 \times (4.2^2-v_2^2)

\Delta E_t = 3.704\ J

b)  \Delta E_t = F_f.d

F_f is the frictional force

     3.704= 12.F

      F_f = 0.308\ N

increase in thermal energy for entire movement of 14 m

     \Delta E_t = 0.308\times 14

     \Delta E_t =4.312 \ J

c)  Work done on the disk by the cue

  W = \Delta KE + \Delta E_{t}

  W = \dfrac{1}{2}\times 0.42 \times (4.2^2-0^2)+ F_f \times d

  W = 3.704+ 0.308 \times 2

   W = 3.704 + 0.616

   W  = 4.32 J

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=======

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U = 240 V

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R = U / I = 240V / 4,16A = <u>57,69 Ω</u>

<u>Answer:</u>

The device with the highest resistance is <u>the electric heater.</u>

<u></u>

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<u></u>

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