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Solutions to Practice test 2
1.
Which of the following is a statement of the first law of motion? According the first law a net force is necessary to change the state of rest or of uniform motion of an object. This can be used to define a force. c. A fo
PHY2048 Unit 3 Assignment Show all your steps and draw diagrams where necessary. Add explanatory notes where necessary. 1. A particle oscillates back and forth in a frictionless bowl whose height is given by h(x) = 0.22x2 where h and x are meters. (a) Sho
Lesson 18 Homework: 1. A 30-kg child sits on a seesaw 1.5 m from the pivot point. How far from the pivot point on the other side will his 45-kg friend has to sit for the seesaw to be in equilibrium? A force of 36 N is applied to a particle located 0.22 m
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Lesson 5.2 Wave Motion
Lesson Objectives: At the end of this lesson students will be able to (i) describe the characteristics wave motion and derive a mathematical expression describing the transverse vibrations of a stretched string. (ii) apply the cha
Solutions to Practice Test 3
1.
Which of the following is NOT a definition of kinetic energy of a moving object? Kinetic energy is a measure of the work done to put an object in motion, or it is a measure of the work done on a moving object to bring it to
Lab 13 Equilibrium of Rigid Bodies
1. Objective: To use the conditions of equilibrium of a rigid body to measure unknown forces and obtain information about the physical parameters of the rigid body. Equipment: Meter ruler, a pivot to balance the ruler, a
Lab 2 Investigating Distance and Speed; Displacement and Velocity Introduction: This investigation is designed to help you learn about distance and speed, and distinguish it from displacement and velocity. Distance is the length of the path traveled by an
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Lesson 1.2 Equations of Motion
1. Uniform and Non-uniform velocity:
t=0 t=1 t=2 t=3 t=4 t=5
t
=1
t
=1
t
=1
t
=1
t
=1
2.0m
2.0 m
2.0 m
2.0 m
2.0 m
Fig. 1The displacement is the same in every 1 s interval
Uniform velocity occurs when equal displacements h
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Lesson 1.1 1. Units and Unit Conversion
Physical quantities are identified by their magnitudes and units. The unit of a physical quantity identifies the type of quantity that is measured. In this course we will be using SI system of units. In this syste
Lab 10 Projectile Motion and Ballistic Pendulum Objective The equations describing the motion of a point object in two dimensions under the influence of gravity can be used to analyze a projectile motion. In this experiment the initial velocity of a proje
Lab 7 Circular Motion
1. 2.
Objective: To study the effect of mass and radius in circular motion.
Equipment: Centripetal force apparatus, slotted weights and hangers, digital stop watch, a length of string.
3.
Theory:
Centripetal force is given by:
4. (a)
Lab 6 Connected Masses
1. Objective: To measure acceleration due to gravity using connected masses. 2. Equipment: A retort stand and clamps, A pulley mounted on ball bearings, slotted weights, meter rule, stop watch, string. Theory: Two masses m1 and m2 a
Lab 3 Velocity and Acceleration
Objects moving with uniform velocity are not common in real life, although we come across many examples of nearly uniform motion. Speeding and slowing down objects are very common around us. When an object changes its veloc
Lab 4 Vectors and Vector addition
In this lab we will investigate vectors using a force board. The force board is marked in degrees from 0o to 360o. Let the 180 0 line represent the x axis and the 90 270 line represent the y axis. You must be familiar wit
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Lesson 1.3 Vectors
1. Vector Addition
In lesson 2 you learned about vectors. Vectors are physical quantities that have both magnitude and direction, and can be represented by drawing an arrow with the length of the arrow proportional to the magnitude of
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Lesson 1.4 Projectile Motion. 1. Components of motion.
In most cases of objects in motion, the motion is not restricted to x or y directions alone. For example, a ball on a table given a sideways push moves as shown in the figure below. The horizontal p
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Lesson 1.5 Relative Velocity and Solving Problems in Projectile Motion 1. Relative Velocity:
All velocities are relative, it depends on the frame in which the measurement is made. For example if you are in a car traveling in the positive x direction at
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Lesson 2.1 Force and Motion
1. The First Law of Motion:
A force is either a pull or a push. It is measured in a unit called newton (N). Force is a vector quantity; it has both magnitude and direction. An object at rest will keep on being at rest until s
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Lesson 2.2 Connected Masses
1.
Motion of connected masses.
Fig. 1 on the left shows two masses m1 and m2 connected by a string that passes over a pulley. If m2 is made slightly greater than m1, there will be a net force on the system of the two masses a
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Lesson 2.3 Force of Friction
1. Force of Friction:
When one surface moves over another surface, always a force exists that opposes the motion. This force is called the force of friction. The force of friction between two surfaces depends on two factors:
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Lesson 2.4 Circular Motion
1. Motion in a Circle
B
O
r
A
Fig. 1
In this lesson we will discuss the case of an object moving around a circle of radius r with a uniform speed v. In the figure above, A is the initial position of an object and B is its posi
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Lesson 3.1 Work and Power
1. Work done by a constant force:
Only a force can do work. A force does work when it produces displacement in the direction of the force. We will only consider here forces that remain constant, that is the force remains the sa
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Lesson 3.2 Energy 1. Energy:
The concept of energy is linked closely with the concept of work. Energy is required to do work. For example, you will not be able to lift a book, if you do not have energy. Thus we can give a qualitative definition to energ
Lab 1 UNITS, DIMENSIONS, ERROR CALCULATION, GRAPHING
1. UNITS
In order that measurement may be meaningful to every body, units of measurements are standardized internationally. Such a system of units is called System Internationale (S.I). The following ar
Lesson 5.5 Homework Solutions 1. The resultant amplitude is given by:
s = 2 A cos
2
= 2 0.02 cos
12
= 0.039 mm
2.
(i) (ii)
Resultant amplitude = 2 A cos Resultant amplitude = 2 A cos
2 2
= 2 0.05 cos = 2 0.05 cos
4
= 0.07 mm =0
2
3.
(i)
(ii)
(iii)
(iv
Lesson 5.5 Homework:
1.
Two sound waves traveling in the same direction both have a frequency of 256 Hz and differ in phase by /6. If they both have an amplitude of 0.02 mm, what is the resultant amplitude? Two waves traveling in the same direction have t
Lesson 17 Homework
1.
5 kg
0.4 m
32 kg
27 kg
1.2 m
The figure shows two masses 27 kg and 32 kg connected by a spring that passes over a frictionless pulley of mass 5 kg and radius 0.4 m. The 27 kg is resting on the table top and the 32 kg is 1.2 m above t
Lesson 17 Homework Solutions
1. The figure shows two masses 27 kg and 32 kg connected by a spring that passes over a frictionless pulley of mass 5 kg and radius 0.4 m. The 27 kg is resting on the table top and the 32 kg is 1.2 m above the table top. If th
Lesson 18 Homework Solutions
1. A 30-kg child sits on a seesaw 1.5 m from the pivot point. How far from the pivot point on the other side will his 45-kg friend has to sit for the seesaw to be in equilibrium? A is the pivot point. The weight of the 30-kg c
Lesson 4.5 Homework: 1. What is the value g on the surface of a planet that has twice the mass of the earth and a radius 1.5 times the radius of the earth? Calculate the force of gravity on a spacecraft 8000 km from the surface of the earth if its mass is