Answer:
1,327,063Joules
Explanation:
Heat energy is the energy needed to convert the state of a body from one phase to another.
According to the question, we want to calculate the total heat required to convert water into vapour (steam).
Note that before water can vapourize, it has to reach the boiling point first which is at 100°C. Heat energy needed to convert the water to 100°C is expressed as H1 = mcΔθ
m is the mass of the object in kg =0.5kg
c is the spcific heat capacity of water = 4183J/kg°C
Δθ is the change in temperature = 100-28 = 72°C
H1 = 0.5*4183*72
H1 = 150,588Joules
Energy required to convert the water to team H2 =mLsteam
Lsteam is the latent heat of vaporization = 2.26×10⁶J/kg
H2 = 0.5*2.26×10⁶
H2 = 1130000Joules
Heat energy needed to convert the water to 150°C is expressed as H3 = mcΔθ
m is the mass of the object in kg =0.5kg
c is the spcific heat capacity of steam= 1859J/kg°C
Δθ is the change in temperature = 150-100 = 50°C
H3 = 0.5*1859*50
H1 = 46,475Joules
Total Heat requires = H1+H2+H3 = 150,588Joules+1130000Joules+ 46,475Joules = 1,327,063Joules
Answer:
Transverse waves oscillate perpendicular to the direction of the wave (e.g. any electromagnetic wave like radiowaves, x-rays...) whilst compressional waves oscillate in the same direction of the wave (e.g. sound waves)
Explanation:
There are no rules that describe how positive energy behaves
in the presence of negative energy, because there is no such
thing as negative energy.
(Wellll ... in pop Psychology, perhaps, but not in any real science.)
Answer:
6.35 m/s
Explanation:
The motion of the salmon is equivalent to that of a projectile, which consists of two independent motions:
- A horizontal motion with constant speed
- A vertical motion with constant acceleration (
, acceleration of gravity)
The horizontal velocity of the salmon is given by:
where
u = ? is the initial speed
is the angle of projection
Then the horizontal distance covered by the salmon after a time t is given by
Or equivalently, the time taken to cover a distance d is
(1)
Along the vertical direction, the equation of motion is
(2)
where
is the initial vertical velocity
If we substitute (1) into (2), we get:
We now that in order to reach the breeding grounds, the salmon must travel a distance of
d = 2.02 m
reaching a height of
h = 0.574 m
Substituting these data into the equation and solving for u, we find the initial speed that the salmon must have:
Answer:
20.6 m
Explanation:
P₁ = Power of first bulb = 45 W
P₂ = Power of second bulb = 130 W
r₁ = distance from the first bulb
r₂ = distance from the second bulb = 35 m
Using the equation
Inserting the values
r₁ = 20.6 m
