University:
Cypress College
Course:
PHYS 201 C | College Physics I
Academic year:

2021
Views:

14

Pages:

22
Author:

NikkiP24

Chapter 3: Motion in a Plane EXERCISES PAGES 44-46 Exercises | Q1. (1) Page 44 Choose the correct option. An object thrown from a moving bus is on example of 1. Uniform circular motion 2. Rectilinear motion 3. Projectile motion 4. Motion in one dimension SOLUTION An object thrown from a moving bus is on an example of Projectile motion. Exercises | Q1. (ii) | Page 44 Choose the correct option. For a particle having a uniform circular motion, which of the following is constant 1. Speed 2. Acceleration 3. Velocity 4. Displacement SOLUTION Speed Exercises | Q1. (iii) | Page 44 Choose the correct option. The bob of a conical pendulum undergoes 1. Rectilinearmotion in horizontal plane 2. Uniform motion in a horizontal circle 3. Uniform motion in a vertical circle 4. Rectilinear motion in vertical circle SOLUTION Uniform motion in a horizontal circle Exercises Q1. (iv) | Page 44 Choose the correct option. For uniform acceleration in rectilinear motion which of the following is not correct? 1. Velocity-time graph is linear 2. Acceleration is the slope of velocity-time graph 3. The area under the velocity-time graph equals displacement 4. Velocity-time graph is nonlinear SOLUTION Velocity-time graph is nonlinear Choose the correct option. If three particles A, B and C are having velocities VA + Va and Ve which of the following formula gives the relative velocity of A with respect to B VA+V VA-Ve+Va VA-Va Ve+VA SOLUTION A VB Exercises Q2. (1) | Page 45 Answer the following question. Separate the following in groups of scalar and vectors: velocity, speed, displacement, work done, force, power, energy, acceleration, electric charge, angular velocity SOLUTION Scalars Vectors Speed, work done, power, energy. electric charge Velocity, displacement, force, acceleration, angular velocity (pseudo vector) Exercises | Q2. (ii)| Page 45 Answer the following question. Define average velocity and instantaneous velocity. When are they same? SOLUTION Average velocity: 1. Average velocity (1) of an object is the displacement AX of the object during the time interval (At) over which average velocity is being calculated, divided by that time interval. 2. Average velocity Displacement Time interval 3. Average velocity is a vector quantity. 4. Its Sl unit is mix and dimensions are [MLT 5. For example, if the positions of an object are x +4 m and x6 m at times t = 0 and t = 1 minute respectively, the magnitude of its average velocity during that time is Var (6-4)/(1-0)=2 m per minute and its direction will be along the positive X-axis 2.im/min. where, i unit vector along X-axis Instantaneous velocity: 1. The instantaneous velocity () is the limiting value of the average velocity interval (AL) nd t when the value of time interval goes to zero. of the object over a small time 2. It is the velocity of an object at a given instant of time. 3-lim dt where derivative of x with respect to t dt In the case of uniform rectilinear motion, le, when an object is moving with constant velocity along a straight line the average and instantaneous velocity remain the same Exercises Q2. (iii) | Page 45 Answer the following question. Define free fail. SOLUTION The motion of any object under the influence of gravity alone is called as free fall Exercises Q2. (iv) | Page 45 Answer the following question. If the motion of an object is described by x = f(t), write formulae for instantaneous velocity and acceleration. SOLUTION