Answer:
B.The force of friction between the block and surface will decrease.
Explanation:
The force of friction is given by
where is the coefficient of friction and is the normal force.
When the student pulls on the block with force at an angle , the normal force on the block becomes
and hence the frictional force becomes
.
Now, as we increase , increases which as a result decreases the normal force , which also means the frictional force decreases; Hence choice B stands true.
<em>P.S: Choice D is tempting but incorrect since the weight </em><em> is independent of the external forces on the block. </em>
There is only one pressure this situation would be a "constant pressure" process
Answer:
The final temperature is 21.531°c
Explanation:
Heat gained by the water = heat lost by the metal
Heat gained = (m)(c)(∆tita)
Where m = mass
C = specific heat capacity
∆tita = temperature change
X = equilibrium temperature
So ....
Heat gained by water
= 175*4.185*(x-20)
= 732.2x - 14644
Heat lost by metal
= 44.5*0.321*(100-x)
=1428.45 -14.2845x
So....
1428.45 - 14.2845x = 732.2x - 14644
1428.45+14644= 732.2x + 14.2845x
16072.45= 746.4845x
16072.45/746.4845= x
21.531 = x
The final temperature is 21.531°c
Answer:
2475042
Explanation:
P = Pressure = [/tex]1\times 10^{-8}\ N/m^2[/tex]
V = Volume = 1 cm³
T = Temperature = 19.5 °C
R = Gas constant = 8.341 J/mol K
= Avogadro's number =
n = Amount of substance
From ideal gas law we have
Number of atoms is given by
The number of atoms in this vacuum is 2475042
50 percent
sperm (father) contains 50 percent and the egg (mother) contains the other 50 each parent gives 50% hope i helped you