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PHY101 Assignment no 1 solution and Discussion Fall spring 2013 Due date : 7 / 5 /2013

Assignment 1: (Spring 2013)
PHYSICS (PHY101)
TOTAL MARKS: 30
Due Date: 07/05/2013
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Don’t wait for the last date to submit your assignment.
Question # 1
The energy in a light wave is transmitted through space by
a. the Successive collisions of series of electrons
b. the successive collision of series of atoms
c. electric field variations
d. electric field and magnetic field variations
e. the successive collision of series of air molecules
Also write the reason of your above selected choice as well. Marks = 3+4
Question # 2
You start on a beach. You go to the moon. You come back. You go to Hollywood. You then go
to the summit of Mount Everest. Have you increased your gravitational potential energy more
than if you had climbed to this summit without all the other side trips? Marks 5
Question # 3
A baseball travelling with horizontal velocity V is caught by a glove. Which of the following
statement is true?
a. The ball applies a greater force to the glove than the glove applies to the ball.
b. The ball applies a greater impulse to the ball than the ball applies to the glove
c. This is an example of an elastic collision
d. The padding of the glove reduces the force of the ball on the glove
e. The padding of the glove reduces the impulse of the ball on the glove
Also write the reason of your above selected choice as well. Marks = 3+4
Question # 4
Inertia is the tendency of an object
I. Initially at rest to stay at rest
II. Initially in motion to continue moving with constant speed
III. Initially in motion to continue moving in a straight line
Which of the following is true?
a. I only
b. I & II Only
c. I & III Only
d. II & III Only
e. I ,II & III
Also write the reason of your above selected choice as well. Marks = 2+3
Question # 5
You are asked to push two wheelbarrows up a hill. One wheelbarrow is empty, and you are able
to push it up the hill in one minute. The other is filled with huge rocks, and even after you push it
for an hour, you cannot budge it. In which case do you do more work on the wheelbarrow,
elaborate your answer?
Marks 6
……………Wish you good luck…………..

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PHY101 Assignment Only Idea May 2013

Question 1 mein option (d) correct hai kyun ke space mein vacuum hai koi electrons ya other particals ya iar nahi hai light electromagnetic wave hai jis mein koi mass bound body ya charged particles nahi hain
Question 2

idea solution

Gravitational Potential Energy

From the work done against the gravity force in bringing a mass in from infinity where the potential energy is assigned the value zero, the expression for gravitational potential energy is


This expression is useful for the calculation of escape velocity, energy to remove from orbit, etc. However, for objects near the earth the acceleration of gravity g can be considered to be approximately constant and the expression for potential energy relative to the Earth's surface becomes


where h is the height above the surface and g is the surface value of the acceleration of gravity.

Gravitational potential energy is acquired by an object when it has been moved against a gravitational field. For example, an object raised above the surface of the Earth will gain energy, which is released if the object is allowed to fall back to the ground. In order for an object to be lifted vertically upwards, work must be done against the downward pull of gravity. This work is then stored as gravitational potentialenergy. When the object is released and falls towards the Earth, the potential is converted into kinetic energy, or movement.

A pendulum is a good example of the relationship between gravitational potential and kinetic energy. At its highest point, the pendulum has only potential energy. As it descends, this is converted into kinetic energy, reaching a maximum at its lowest point, where it has no potential energy. As it swings up again, the kinetic is converted to potential energy.

Q4: Option e is correct:

The law of inertia states that it is the tendency of an object to resist a change in motion. According to Newton, an object will stay at rest or stay in motion (i.e. 'maintain its velocity' in modern terms) unless acted on by a net external force, whether it results from gravity, friction, contact, or some other source. The Aristotelian division of motion into mundane and celestial became increasingly problematic in the face of the conclusions of Nicolaus Copernicus in the 16th century, who argued that the earth (and everything on it) was in fact never "at rest", but was actually in constant motion around the sun.[11] Galileo, in his further development of the Copernican model, recognized these problems with the then-accepted nature of motion and, at least partially as a result, included a restatement of Aristotle's description of motion in a void as a basic physical principle:

A body moving on a level surface will continue in the same direction at a constant speed unless disturbed.[12]
Galileo writes that 'all external impediments removed, a heavy body on a spherical surface concentric with the earth will maintain itself in that state in which it has been; if placed in movement towards the west (for example), it will maintain itself in that movement'. This notion which is termed 'circular inertia' or 'horizontal circular inertia' by historians of science, is a precursor to, but distinct from, Newton's notion of rectilinear inertia For Galileo, a motion is 'horizontal' if it does not carry the moving body towards or away from the centre of the earth, and for him 'a ship, for instance. having once received some impetus through the tranquil sea, would move continually around our globe without ever stopping

Q5 mein work ki equation se e sab explain ho jata hai w= fxd

to 1st case mein empty ke sath distance taye hua work hua second case mein jab distance tha e nai chahe ghanta laga to equation se work to zero ho gaya

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Lakin Kiya Sir 

Its serious matter to got zero marks in every assignment.

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Question 2
idea solution

Gravitational Potential Energy

From the work done against the gravity force in bringing a mass in from infinity where the potential energy is assigned the value zero, the expression for gravitational potential energy is
This expression is useful for the calculation of escape velocity, energy to remove from orbit, etc. However, for objects near the earth the acceleration of gravity g can be considered to be approximately constant and the expression for potential energy relative to the Earth's surface becomes
where h is the height above the surface and g is the surface value of the acceleration of gravity.
Gravitational potential energy is acquired by an object when it has been moved against a gravitational field. For example, an object raised above the surface of the Earth will gain energy, which is released if the object is allowed to fall back to the ground. In order for an object to be lifted vertically upwards, work must be done against the downward pull of gravity. This work is then stored as gravitationalpotential energy. When the object is released and falls towards the Earth, the potential is converted into kinetic energy, or movement.
A pendulum is a good example of the relationship between gravitational potential and kinetic energy. At its highest point, the pendulum has only potential energy. As it descends, this is converted into kinetic energy, reaching a maximum at its lowest point, where it has no potential energy. As it swings up again, the kinetic is converted to potential energy.

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