SCIENTIFIC NOTATION
Exercise:
1) 86kN = ________ mN
Answer :
86=8.6 x 10
=8.6x10x103/10-3
=8.6 x 107
2) 45kMJ-1 = _________m3
Answer:
45=4.5x10
=4.5 x 103=4.5 x 104 /60x60
=4.5 x 104 /3600
=1.25 x 10
3)78 g cm min-2 = _________kgms-1
Answer:
=78 / 1000 kg cm min -2
=0.078 /100 kg m min-2
=0.00078/min2 kgm
=(0.00078 /60 s)2 kgms-2
=2.167 x 10-7 kgms-2
2. What is 350 degrees Fahrenheit in Celsius?
3. What is meant by normal freezing point?
Normal freezing point is 0 degrees Celsius, 32 degrees Fahrenheit. Normal freezing point means the temperature at which a substance freezes, specifically at a pressure of 1 atmosphere.
1. 1. What is 35 degrees Celsius in Fahrenheit?
Fahrenheit = 9 x 35°C / 5 + 32
= 95 Fahrenheit
2. What is 350 degrees Fahrenheit in Celsius?
Use the formula C = 5/9 (F-32).
350 degrees Fahrenheit = (350 - 32 ) x 5/9 = 176.67 degrees Celsius
3. What is meant by normal freezing point?
Normal freezing point is 0 degrees Celsius, 32 degrees Fahrenheit. Normal freezing point means the temperature at which a substance freezes, specifically at a pressure of 1 atmosphere.
Exercise 1
S = ut + ½ (at2)
By using dimensional analysis, show that the equation is dimensionally correct.
Answer:
So, S = L
S = (LT-1)(T) + ½ (LT-2)(T)
S = L + ½ L
L = L + ½ L = both side with the same dimension
Hence, the equation is dimensionally correct
Exercise 2
show the homogenous of the physics equation below:
P=hpg where P is pressure, h is height, p is density and g is gravity. What is the unit of P??
h = height (m) SI Pascal = Pa
p = density (kgm-3)
g = gravity (Nkg-1)
P = hpg
MLT-2/L2 = (M/L3) (LT-1/T)
MT-2= L (M/L3) (LT-1/T)
MT-2 = M/L
M = M/L X (1/T2)
Thus, =MT-2/L
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