Question

1) A ball is thrown vertically upwards with a velocity of 62 m/s. Find the maximum height it reaches.

2) Find the energy in KWh Consumed in 10 hours by a machine of power 500W

3) CHEMISTRY
Calculate the number of atoms of each carbon, sodium, oxygen in 53g of Na2CO3

Answer 1

hallo your question is nice

to know the maximum height
the formula is
=at highest point
initial velocity=u
final velocity=0

Applying kinametic equation
v^2-u^2=2as
h=u^2/2g
h=(62×62)/2×9.8
h=196.122m

2.the formula to get energy
=power.time
=1/2.10. (power=500w
=5kwh =1/2kw
time=10hr


3.the equation is

Na+o2+C=Na2Co3
=4Na+3O2+2C=2Na2Co3=106g

4mole+3mole+2mole=106g
2mole+3/2mole+1mole=53g
Na=2×6.023×10..atom
o2=3/2×6.023×10..atom
c=6.023×1...stop






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