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DENIUS [597]
4 years ago
12

Two objects are made of the same material, but they have different masses and temperatures.

Physics
2 answers:
Xelga [282]4 years ago
8 0

Answer:

a. The one with the lesser mass.

Explanation:

Since , both are made of the same material , they will have same specific heat . On physical contact , heat will be exchanged between them with heat flowing from body at higher temperature to one at lower temperature . Amount of heat lost by one will be equal to amount of heat gained .

So temperature change will take place in both of them  but they will not be same . Body of higher mass will undergo lesser change in temperature because of the following relation

Q = mcΔT

ΔT = Q / mc

ΔT   ∝   1 / m

change in temperature will be inversely proportional to mass of object if Q or heat exchanged is constant .

galben [10]4 years ago
3 0

Answer:

f. Not enough information

Explanation:

Since, we know from the equation of heat transfer by a mass due to temperature difference is given as:

Q=m.c.\Delta T

\Rightarrow \Delta T=\frac{Q}{m.c}

where;

m= mass of the substance

c= specific heat of the substance

\Delta T= difference between the final and initial temperature

Since the temperature difference depends upon the heat transferred which depends upon initial temperature of the substance and the mass of the substance.

So, it is ambiguous that which mass has the higher temperature the greater mass or the lesser mass.

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igomit [66]
PEMDAS which means Parenthesis, Exponet, Multiplication, Division, Addition, and Subtraction.
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3 years ago
A 80 kg skier grips a moving rope that is powered by an engine and is pulled at constant speed to the top of a 25 degrees hill.
zloy xaker [14]

Answer:

P=28.085\,hp

Explanation:

Given that:

  • mass of 1 skier, m=80kg
  • inclination of hill, \theta=25^{\circ}
  • length of inclined slope, l=220m
  • time taken to reach the top of hill, t=2.3 min= 138 s
  • coefficient of friction, \mu=0.15

<em>Now, force normal to the inclined plane:</em>

F_N=m.g.cos\theta

F_N=80\times 9.8\times cos25^{\circ}

F_N=710.54\,N

<em>Frictional force:</em>

f=\mu.F_N

f=0.15\times 710.54

f=106.58\,N

<em>The component of weight along the inclined plane:</em>

W_l=m.g.sin\theta

W_l=80\times 9.8\times sin25^{\circ}

W_l=331.33\,N

<em>Now the total force required along the inclination to move at the top of hill:</em>

F=f+W_l

F=106.58+331.33

F=437.91\,N

<em>Hence the work done:</em>

W=F.l

W=437.91\times 220

W=96340.80\,J

<em>Now power:</em>

P=\frac{W}{t}

P=\frac{96340.80}{138}

P=698.12\,W

<u>So, power required for 30 such bodies:</u>

P=30\times 698.12

P=20943.65\,W

P=\frac{20943.65}{745.7}

P=28.085\,hp

8 0
3 years ago
A sports car traveling along a straight line increases its speed from 19.8 mi/h to 59.9 mi/h.a. What is the ratio of the final t
Natasha2012 [34]

Answer

given,

initial speed of the car (v₁)= 19.8 mi/h

final speed of the car (v₂)= 59.9 mi/h

a) initial momentum = m v₁

                   P₁ = 19.8 m

  final final momentum = m v₂

                   P₂ = 59.9 m

      ratio = \dfrac{P_2}{P_1}

              =\dfrac{59.9 m}{19.8 m}

      ratio of momentum=\dfrac{P_2}{P_1}=3.025

b) initial kinetic energy= 1/2 m v₁²

                   K₁ = 196.02 m

  final kinetic energy= 1/2 m v₂²

                   K₂ = 1794.005 m

      ratio = \dfrac{K_2}{K_1}

              =\dfrac{1794.005 m}{196.02 m}

      ratio of Kinetic energy=\dfrac{P_2}{P_1}=9.15

8 0
3 years ago
Which is the best description of a high pressure system?
ruslelena [56]

Answer:

The Answer is gonna be B.

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6 0
3 years ago
When you look at green dots with a red filter what color did you see?
Dimas [21]
-- Looking at the dots casually, they look green because they absorb all other
colors of light, and only green light is left to proceed to your eyes. (In order for
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Daylight and most light bulbs work fine.)

-- The filter looks red because it absorbs all other colors of light, and only
the red light is left to pass through the filter and come out on the other side.

-- When the green light from the dots hits the red filter, it's absorbed in the
filter, and there's no light left to come out on the other side.

If you're looking through the filter at the dots, they look <em>black</em>.

3 0
3 years ago
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