Answer:
Explanation:
Given the following data;
Mass = 35 kg
Velocity = 3 m/s
To find the kinetic energy of the child;
K.E = ½mv²
Atmospheric pressure is caused by the weight of the atmosphere pushing down on itself and on the surface below it.
Pressure is defined as the force acting on an object divided by the area upon witch the force is acting.
Answer:
The density of the wood is
ρ₂ = 1.21 g / cm³
Explanation:
The block measures
V₁ = 10.0 cm * 4.0 cm * 2.0 cm
V₁ = 80 cm³
Now the block measures under the water getting just the face below as 1.65 cm
V₂ = 10.0 cm * 4.0 cm * 1.65 cm
V₂ = 66 cm³
So to determine the density knowing the mass are the same as the weight
ρ₁ * V₁ = ρ₂ * V₂
Using the density of the water as a
ρ₁ = 1 g / cm ³
1 g / cm³ * 80 cm ³ = ρ₂ * 66 cm³
ρ₂ = 1.21 g / cm³
Initially there were 10 bulbs of 60 Watt power
So total power of all bulbs = 60 * 10 = 600 W
now each bulb used for 4 hours daily
so total energy consumed daily
now we have total power consumed in 1 year
cost of electricity = 10 cents/ kWh
so total cost of energy for one year
Now if all 60 Watt bulbs are replaced by 30 Watt bulbs
So total power of all bulbs = 30 * 10 = 300 W
now each bulb used for 4 hours daily
so total energy consumed daily
now we have total power consumed in 1 year
cost of electricity = 10 cents/ kWh
so total cost of energy for one year
total money saved in 1 year