Answer:
Explanation:
mass of copper m = 0.3 kg
Initial temperature t₁ 77K = 77 - 273 = -196°C
Final temperature t₂ = - 20°C
Mass of water M = ?
Initial temperature of water = 50°C
Final temperature = - 20°C
Heat lost by copper
0.3 x 385 x ( -20+ 196 )
= 20328 J
Heat lost by water to cool to 0°C
= M x4186 x (50-0)
= 209300 M
Heat lost by water to cool to freeze at 0°C
= M x 335 x 10³ J
Heat lost by ice to cool to - 20°C
= Mx 2060 x 20
= 41200 M
Total heat gained
= 585500 M
Heat lost by water = heat gained by copper block
585500 M = 20328
M = .03472 Kg
= 34.72 g
Answer:
23 m/s
Explanation:
The net external force on the propeller is 17N
The airplane is 0.75 kg
Therefore the acceleration of the plane can be calculated as follows
= 17/0.75
= 23 m/s
Hence the acceleration of the airplane is 23 m/s
I believe that would be the second law of motion
Answer:
The ratio of the young's modulus of steel and copper is 
(c) is correct option.
Explanation:
Given that,
Length of steel wire = 4.7 m
Cross section
Length of copper wire = 3.5 m
Cross section
We need to calculate the ratio of young's modulus of steel and copper
Using formula of young's modulus for steel wire
....(I)
The young's modulus for copper wire
....(II)
From equation (I) and (II)
The ratio of the young's modulus of steel and copper
Hence, The ratio of the young's modulus of steel and copper is
Explanation:
Ohms law states that the electrical current present in a metallic conductor is directly proportional to the potential difference between the metallic conductor and inversely proportional to the resistance therefore if the voltage is increased resistance also increases provided that temperature and other physical properties remains constant V=IR
