Quiz 3
Quiz 3
Quiz 3
OF PHYSICS
Quiz of chapter 3 TIME:8-min.
1) The coordinates of a particle moving in the x-y plane are given as a function of time by
r = 3t i + 2t2j where r in m and t in s. At t=2 s, the horizontal displacement of the particle is:
a) 6 m b) 8 m c) 10 m c) 5 m
2) The coordinates of a particle moving in the x-y plane are given as a function of time by
r = 3t i + 2t2j where r in m and t in s. At t=2 s, the vertical displacement of the particle is:
a) 6 m b) 8 m c) 10 m c) 5 m
3) The coordinates of a particle moving in the x-y plane are given as a function of time by
r = 3t i + 2t2j where r in m and t in s. At t=2 s, the disctance of the particle is:
a) 6 m b) 8 m c) 10 m c) 5 m
4) The coordinates of a particle moving in the x-y plane are given as a function of time by
r = 3t i + 2t2j where r in m and t in s. At t=2 s, the horizontal velocity of the particle is:
5) The coordinates of a particle moving in the x-y plane are given as a function of time by
r = 3t i + 2t2j where r in m and t in s. At t=2 s, the vertical velocity of the particle is:
6) The coordinates of a particle moving in the x-y plane are given as a function of time by
r = 3t i + 2t2j where r in m and t in s. At t=2 s, the speed of the particle is:
7) The coordinates of a particle moving in the x-y plane are given as a function of time by
r = 3t i + 2t2j where r in m and t in s. At t=2 s, the acceleration of the particle is:
1
9) At the maximum hight of a projectile, the accelration is
10) A particle is thrown with a a velocity of 6 i + 8 j m/s. The speed of the particle at the maximum
hight is
11) A particle is thrown from the ground with a a velocity of 6 i + 8 j m/s. The speed of the particle
just before hitting the ground is
12) A particle is thrown from the ground with a a velocity of 6 i + 8 j m/s. The velocity of the
particle just before hitting the ground is:
13) Ball A is thrown horizontally and at the same instant ball B is dropped from the same point.
Which ball will reach the ground first?
50 m
a) 6.5 s b) 4.5 s c) 2.4 s d) 4.8 s.
50 m
a) 32i -39.4j b) 32i +39.4j c) 32i -24j m/s d) 32i+24j m/s
m/s m/s
2
16) A particle is thrown from the top of a building 50 m in height
with initial speed of 40m/s that makes an angle of 37o above the 40 m/s
horizontal. The the ball hits the ground at a point: 37o
a) 208 m from the base of the b) 144 m from the base of the
building building 50 m
c) 76.8 m from the base of the d) 152.6 m from the base of the
building building
a) 27.9 m b) 13.5 m c) 77 m d) 38 m
40 m/s 37o
96 m
18) A stone is thrown toward the top of a building with an
initial speed of 40 m/s that makes an angle of 60o above the
horizontal. If the range of the projectile is 96 m, what is the
velocity of the stone as it lands on the building?
40 m/s 37o
96 m
a) 32i -5.4j b) 5.4 m/s c) 32i +5.4j d) 32i -24j
m/s m/s m/s
a) 3 s b) 2.4 s c) 4 s d) 2 s
40 m/s 37o
21) A particle moves at constant speed in a circular path. The direction of its acceleration vectors is:
3
22) The centripetal acceleration is due to the change in
23) A particle moves with constant speed of 4 m/s around a circle of radius 2 m. Its acceleration is
23) A car rounds a 20-m radius curve with constant speed of 10 m/s. Its acceleration is
24) A plane flies with a velocity of 500 km/hr north with respect to the wind. If the wind blows east
with a speed of 200 km/hr, the speed of the plane relative to the earth is:
25) A boat travels with a speed of 14 m/s north with respect to the water. If the water flows east
with a speed of 6 m/s, the speed of the boat relative to the earth is
26) A boat travels in a 500-m river with a speed of 14 m/s north with respect to the water. If the
water flows east with a speed of 6 m/s, the time needed for the boat to cross the river is:
27) A boat travels in a 500-m river with a speed of 14 m/s north with respect to the water. If the
water flows east with a speed of 6 m/s, the boat will reach the opposite bank of the river at a point:
a) 214 m east of the staring point b) directly opposite to the starting point
c) 150 m east of the staring point d) 500 m east of the staring point
28) A pilot flies with a velocity of 500 km/hr due east, relative to the air which is blowing north.
After 2 hr, he finds himself at a point that is 200 km north of its staring point. The speed of the air
relative to the ground is: