Answer:
63.3 KJ
Explanation:
Quantity of heat lost to the skin = mLw + mcΔT
where is mass in kg, Lw is latent heat of vaporization in KJ/kg ( 2.256 × 10^6 KJ/Kg), c is specific heat capacity of water (4190 J/(Kg.K) and ΔT is the change in temperature
m = 25g = 25 /1000 = 0.025 kg
quantity of heat loss = (0.025 × 2.256 × 10^6) + ( 0.025 × 4190 × (100 -34 )
Quantity of heat loss to the skin = (5.64 × 10^4) + 5530.8 = 56400 + 6913.5 = 63313.5 = 63.3 KJ
A 2000-kg car decelerated from 10 m/s to 5 m/s. What is the work done on the car ?
Known :
Car’s mass (m) = 2000 kg
Initial speed (vo) = 10 m/s
Final speed (vt) = 5 m/s
Wanted: net work
Solution :
Net work :
Wnet= ΔEK
Wnet = ½ m (vt2 – vo2)
Wnet = ½ (2000)(52 – 102)
Wnet = (1000)(25 – 100)
Wnet = (1000)(-75)
Wnet = -75,000 Joule
The minus sign indicates that the direction of displacement is opposite with the direction of the net force.
Answer:
Hey guess what there's no question genius
Explanation:
Answer: The block of 0.4 Kg travel the same distance that the block of
0.2 Kg
Explanation: Considering the second newton law, we have the following
F= m*a
F= P*sin (θ) where θ is the angle for the incline
so mg sin (θ)= m*a
a=g sin(θ)
both block have the same acceleration in the inclined plane so travel the same distance independent of its mass.
Answer:
The molecules in hot air are moving faster than the molecules in cold air.