In both scenarios, the position - time graph will be a linear graph, since the speed is constant, so your position is moving at a consistent pace.
You are calculating the Entropy of the system.
Answer:
Explanation:
Given dish width= 48ft
Depth = 4ft
Using equation of a parabola
x²= 4py
48² = 4p 4
4p = 576
P= 144ft
Thus the the receiver should be placed 144ft from t the vertex
We use kinematic equation of motion,
Here, s is distance traveled, u is the initial velocity, t is time taken and g is acceleration due to gravity.
Given, 
.
We take, 
because stone has no initial velocity.
Therefore,
Thus, the height of cliff is approximately 61.75 m.
Answer:
22425 J
Explanation:
From the question,
Applying
Q = cm(t₂-t₁).................. Equation 1
Where Q = Thermal Energy, c = specific heat capacity of aluminium, m = mass of aluminium, t₂ = Final Temperature, t₁ = Initial Temperature.
Given: c = 897 J/kg.K, m = 1.0 kg, t₁ = 50 °C, t₂ = 25 °C (The final temperature is reduced by half)
Substitute these values into equation 1
Q = 897×1×(25-50)
Q = 897×(-25)
Q = -22425 J
Hence the thermal energy lost by the aluminium is 22425 J
