Summited date 16/09/2013EC (from 10%) SEMISTER PHYSICS ASSIGHMENT FOR
Show the necessary step clearly and neatly and you will take good hand write
1 If a speed of an object is doubled by what factor does the kinetic energy of the object change (pt)
2
When 100J of energy is stored in a spring, the spring is compressed 50cm. what is the force constant of
the spring (Ipt)
Weite the difference between renewable and non-renewable resource (Ipt)
List and explain the renewable resource about positive and negative impact (2.pt)
5. How to generate energy in Ethiopia (1pt)
4
6 A machine is 60% efficient. The effort moves through 5 times the distance the load moves. What effort
is required to raise a load of 120N (ipt)
7. A particle of mass 200g is thrown straight up with a velocity of 4m/s, what PE did object gain at
8
An inclined plane length 10m has a height of 6m, if the coefficient
A What force parallel to the plane is needed to slid the 20kg block up the plane with a uniform speed
(ipt)
B. What is the sufficient of the plane (2pt)
maximum height (1pt)
plane is 0.4

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

An charge with mass m and charge q is emitted from the origin, (x, y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.