Questions about Chapter 4: Motion in two and three Dimension.


Question  No: 1

A car travels due east with a speed of 10.0 m/s. Rain is falling vertically relative to the Earth with a speed of 5.0 m/s. At what angle from the vertical direction does the rain appear to be falling as observed by the driver of the car?

 

A. 63.4 degrees

B. 26.6 degrees

C. 24.1 degrees

D. 41.8 degrees

E. 85.2 degrees

 


Question  No: 2

A ball is thrown from the top of a building with an initial velocity of 8.00 m/s making an angle of 20.0 degrees below the horizontal as shown in figure (4). It strikes the ground 3.00 s later. Find the height from which the ball was thrown.

 

A. 26.5 m

B. 72.2 m

C. 9.80 m

D. 35.0 m

E. 52.3 m

 


Question  No:3

A stone is tied to the end of a string and is rotated with constant speed around a horizontal circle of radius 1.5 m. It makes two complete revolutions each second. What is the magnitude of its acceleration?

 

A. 0.24 m/s**2

B. 240 m/s**2

C. 24 m/s**2

D. 2.4 m/s**2

E. 2400 m/s**2

 


Question  No:4

Which of the following is NOT an example of accelerated motion?

 

A. A particle moving in the +x-direction with constant speed

B. The projectile motion

C. The Earth's motion around Sun

D. The circular motion at constant speed

E. The motion of a freely falling body

 


Question  No:5

At t=0, a particle leaves the origin with a velocity of 6.0 m/s in the positive y direction. Its acceleration is given by: a = (2.0 i - 3.0 j) m/s**2. At the instant the particle reaches its maximum y coordinate, find the velocity of the particle.

 

A. 6.0 m/s in the positive x direction

B. 8.0 m/s in the positive x direction

C. 4.0 m/s in the positive x direction

D. 12 m/s in the positive y direction

E. 0 m/s