Answer:
Explanation:
From work energy theorem
Work done by all forces = Change in kinetic energy
Lets take
m= mass of object
h=height from the ground surface
initial velocity of object = 0 m/s
The final velocity of object is v
Work done by gravitational force = m g . h
The final kinetic energy = 1/2 m v²
So
Work done by all forces = Change in kinetic energy
m g h = 1/2 m v² - 0
v² = 2 g h
Answer:
The answer is c
Thermal energy moves within the air from the flames to the marshmallow.
Explanation:
Hope it helps
Answer:
t = 8.3s
Explanation:
V = 100 m/s U = 0 m/s t = ? a = 12 m/s2
V = U + at
100 = 0 + 12 × t = 100 = 12t
12t = 100
t = 100/12 = 25/3
t = 8.3s
Answer:
Explanation:
In Carnot engine , temperature difference is used to get work output .
The maximum efficiency of a Carnot engine
= (T₁ - T₂) / T₁
where T₁ is temperature of hot reservoir , and T₂ is temperature of cold reservoir
= efficiency = ( 35 - 4 ) / ( 273 + 35 )
= 31 / 308
in percentage terms
efficiency = (31 / 308) x 100
= 10.06 % .
