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# GSC101- General Science Assignemnt No.2 Due Date 11 December 2014 Discussion and Solution

Assignment 2: (Fall 2014)
General Science (GSC101)
TOTAL MARKS: 25
Due Date: 11/12/2014
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Question # 1
A box of mass 50 kg covers a distance of 75 m in 5 minutes. The box is displaced by a rope
making an angle 45 degree with horizontal. Find the amount of work done and power consumed
to displace the box. Marks = 4+3
Question # 2
Energy can neither be created nor be destroyed, but can be converted from one form to another.
Verify this statement by giving examples. Marks = 3+3
Question # 3
An object ‘momentum depends upon the object’s
Note: Select the best choice given below according to your best of knowledge, and also write the
reason of your selected choice as well.
a) mass speed and acceleration
b) mass speed and direction of motion
c) speed and acceleration
d) velocity and direction of motion
e) mass and acceleration
Marks = 2+3
Question # 4
Calculate the molecular mass of the following substances:
H2O, H2SO4,C6H12O6 Marks = 3
Question # 5
A light ray strikes the surface of a pond at an angle 38.5°. At what angle is the ray refracted.
Marks = 4
--------------------------------GOOD LUCK---------------------------------------------

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Question # 4
Calculate the molecular mass of the following substances:
H2O, H2SO4,C6H12O6 Marks = 3

To find the molecular mass,  we add the atomic masses of all of the atoms in the molecule.  To Find the atomic mass for each element by using the mass given in the Periodic Table. Multiply the subscript (number of atoms) times the atomic mass of that element and add the masses of all of the elements in the molecule to get the molecular mass.

molecular mass C6H12O6 = 6(12.01) + 12(1.008) + 6(16.00) =180.16

180.16

Water, H2O;

=1*2+16

=18amu

H2SO4

=1*2+32+16*4

=98amu

Question # 1

A box of mass 50 kg covers a distance of 75 m in 5 minutes. The box is displaced by a rope making an angle 45 degree with horizontal. Find the amount of work done and power consumed to displace the box.

Solution:

Required Data :

Mass=m=500kg

Distance=S=75m

Time=5min

Angle==

We have to find

Amount of work done=?

Power =?

So we first find

Work

We know that

F=W=mg

=500*9.8

w=4900j

For Angle

W=FS(Cos)

=490*75(cos )

=36750(0.52532198)

=19305.5830891

P=?

We know that

P=w/t

=

=6435.19436303w

Question # 2
Energy can neither be created nor be destroyed, but can be converted from one form to another.
Verify this statement by giving examples.

This is the law of conversation of energy

The law of conservation of energy is a law of science that states that energy cannot be created or destroyed, but only changed from one form into another or transferred from one object to another.

Examples: Law of Conservation of Energy

• Water can produce electricity. Water falls from the sky, converting potential energy to kinetic energy. This energy is then used to rotate the turbine of a generator to produce electricity. In this process, the potential energy of water in a dam can be turned into kinetic energy which can then become electric energy.
• When playing pool, the cue ball is shot at a stationary 8 ball. The cue ball has energy. When the cue ball hits the 8 ball, the energy transfers from the cue ball to the 8 ball, sending the 8 ball into motion. The cue ball loses energy because the energy it had has been transferred to the 8 ball, so the cue ball slows down.
• Kelly ran across the room and bumped into her brother, pushing him to the floor. The kinetic energy she possessed because of her movement was transferred to her brother, causing him to move.
• When a moving car hits a parked car and causes the parked car to move, energy is transferred from the moving car to the parked car.
• When playing the lawn game bocce ball, a small ball is thrown with the intention of hitting larger balls and causing them to move. When a larger ball moves because it was hit by the small ball, energy is transferred from the small ball to the larger one.
• When you push a book across the table, the energy from your moving arm is transferred from your body to the book, causing the book to move.
• A cat sitting on the highest branch of a tree has what is known as potential energy. If he falls off the branch and falls to the ground, his potential energy is now being converted into kinetic energy.
• When kicking a football that is sitting on the ground, energy is transferred from the kicker’s body to the ball, setting it in motion.
• Sam was rearranging furniture, and needed help to push the heavy sofa. His brother came over, and together they were able to lift the sofa onto sliders. This made it easy to push the sofa across the room. When Sam and his brother pushed the sofa and it slid across the wood floor, energy was transferred from the men to the piece of furniture.
• A fly ball hits a window in a house, shattering the glass. The energy from the ball was transferred to the glass, making it shatter into pieces and fly in various directions.

Question # 5:
A light ray strikes the surface of a pond at an angle 38.5°. At what angle is the ray refracted.
The angle that the refracted ray makes with the normal line is referred to as the angle of refraction.
Formula:
Refractive index of glass is 1.50 and that of water is 1.33.
The constant n are the indices of refraction for the corresponding media.
N1sin(0)=n2sin(0)
O=angle=45
N1=air refractive index
N2= of water
Put angle and simplify.

Refractive index of glass is 1.50 and that of water is 1.33.
The constant n are the indices of refraction for the corresponding media.

refrective index of air is 45
N1sin(38.5)=n2sin(r)
45.sin(38.5)/1.33 = sin(r)

sin^-1(21.062) =r

45*sin(38.5)/1.33=sinr

45*0.71797/1.33=sin(r)

32.30865/1.33= sin(r)

24.2=sinr

it's correct ?

Tell me inam bai

Thank you inam bai

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