PHY101 Physics Solution Fall Discuss about Assignment No 2 January 2013

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PHY101 Physics Solution Fall Discuss about Assignment 2013

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Physics (PHY101) VU of Pakistan
Assignment 2: (Fall 2012)
PHYSICS (PHY101)
TOTAL MARKS: 25
Due Date: 04/12/2012
DON’T MISS THESE Important instructions:
• To solve this assignment, you should have good command over first 17 lectures.
• Upload assignments (Microsoft word) properly through LMS, (No Assignment will be
accepted through email).
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• All students are directed to use the font and style of text as is used in this document.
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• Use Math Type or Equation Editor etc for mathematical symbols.
• This is not a group assignment, it is an individual assignment so be careful and avoid
copying others’ work. If some assignment is found to be copy of some other, both will be
awarded zero marks. It also suggests you to keep your assignment safe from others. No
excuse will be accepted by anyone if found to be copying or letting others copy.
Don’t wait for the last date to submit your assignment.
Question # 1
In one experiment, a red wagon at rest is pushed to the left with a force of 150N for 1.0s. In a
second experiment a blue wagon with the same mass as the red wagon is pushed from rest to the
left with a force of 150N for 2.0s. Which statement below is true? Marks = 7
(3+4)
a) The red wagon had a smaller impulse but a larger change in momentum than the blue.
b) The red wagon had a smaller impulse and a smaller change in momentum than the blue.
c) The red wagon had a same impulse and a same change in momentum as the blue.
d) The red wagon had a larger impulse but a smaller change in momentum than the blue.
e) The red wagon had the same impulse but a larger change in momentum than the blue.
*Write the reason of your above selected choice as well.
Physics (PHY101) VU of Pakistan
Question # 2
The light’s wavelength is 6.0×10-7 m. The light completes 5.0 cycles in 10-14 seconds. What is
the light’s wave speed? Marks = 5
Question # 3
A person takes a 2.0Kg mass and lifts it 0.50m above a table that is itself 1.0m above the floor.
The person then moves the mass 1.0m to the side so that it is directly over the floor, 1.50m
below. Which statement is true? Marks 7 (2+5)
a) The mass has 30.0J of Gravitational Potential Energy (GPE) relative to the floor.
b) The person did 10.0J of work in lifting the mass.
c) The mass has 10.0J of Gravitational Potential Energy (GPE) relative to the table.
d) The person did not work against gravity when moving the mass 1.0m to the side.
e) All of the above are true.
*Write the reason of your above selected choice as well.
Question # 4
If an object on a horizontal, frictionless surface is attached to a spring, displaced, and then
released, it will oscillate. If it is displaced 0.120 m from its equilibrium position and released
with zero initial speed, then after 0.800 s its displacement is found to be 0.120 m on the opposite
side, and it has passed the equilibrium position once during this interval.
Find (a) the amplitude; (b) the period; (c) the frequency. Marks = 6

[viki]

Question. No: 3
An astronaut standing on the moon holds a large, heavy rock and a small, light stone, and then releases them from the same height. Which object reaches the moon‘s surface first?
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) The rock, because it‘s heavier and accelerate faster
b) The rock, because it has a greater force of gravity acting on it.
c) The stone, because there is less air frication acting on it.
d) They reach on the surface at the same time because their acceleration due to gravity is equal.
e) Both the rock and stone will just float there when released-there is no gravity on the moon.
Answer: is D because their acceleration due to gravity is equal (gravity at moon is 1.62)

[viki]

formula of Question 1 :
first we should find the distance d=W/F. because there distance is not given .
then we use the work equation:
Work = Force*distance cos (theta). book pg:17 Lec:7