Answer:
v₁ = 5 m/s
Explanation:
We can use the law of conservation of momentum here:

where,
m₁ = m₂ = m = mass of each disk
u₁ = initial speed of yellow disk = 0 m/s
u₂ = initial speed of orange disk = 5 m/s
v₁ = final speed of yellow disk = ?
v₂ = final speed of orange disk = 0 m/s
Therefore,

<u>v₁ = 5 m/s</u>
Ans is <span>I. Flowing groundwater that dissolves rock , such as limestone</span>
Solution here,
mass of cylinder(m)=100 g
radius of cylinder(r)= 4 cm
momoent of inertia(I)=?
we have,
I=mr^2=100×4^2=1600 g/cm^2
Answer:
Change in temperature =7.14° C
Explanation:
Assuming all potential energy of cylinder is converted into heat energy to increase the temperature .
Work done by gravity in first case =m *g*h= 3*10*500=15000
Let quantity of water be 1 kg at 0°C.
Also specific heat capacity of water is =4200 Joule
So potential energy is converted to m*4200*T(1) =15000
T(1)=3.57
Work done by gravity in first case =m *g*h= 9*10*500=45000
Here also potential energy is converted into m*4200*T(2)=45000
T(2)=10.71
Here temperature is increasing.
Thus change in temperature =T(1) -T(2) =7.14° C