1.
A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:
A
100 km
B
25 km
C
15 km
D
10 km
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20 practice sets · Page 1 of 1
A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:
100 km
25 km
15 km
10 km
The basic unit of speed is:
km/min
m/min
km/h
m/s
Which of the following relations is correct?
Speed = Distance x Time
Speed = Distance / Time
Speed = Time / Distance
Speed = 1 / Distance x Time
Which one of the following is an example of a vector quantity?
mass
distance
area
velocity
Which of the following operations will not change a vector?
Translate it parallel to itself.
Add a constant vector to it.
Multiply it by a constant factor.
Rotate it.
Which of the following is an accurate statement?
The magnitude of a vector can be less than the magnitude of one of its components.
The magnitude of a vector can be positive or negative.
A vector cannot have zero magnitude if one of its components is not zero.
If the magnitude of vector A is less than the magnitude of vector B, then the x-component of A is less than the x-component of B.
Two vectors, of magnitudes 20 and 50, are added. Which one of the following is a possible answer for the magnitude of the resultant?
80
10
40
20
Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. When these two vectors are added, the magnitude of the sum
is 12 m.
could be as small as 2.0 m, or as large as 12 m.
is 2.0 m.
is larger than 12 m.
Three forces, each having a magnitude of 30 N, pull on an object in directions that are 120o apart from each other. Make a statement concerning the resultant force.
The resultant force is zero.
The resultant force is greater than 30 N.
The resultant force is less than 30 N.
The resultant force is equal to 30 N.
The resultant of two vectors is the smallest when the angle between them is
90 degree
45 degree
180 degree
0 degree
The acceleration of gravity on the Moon is only one-sixth of that on Earth. If you hit a baseball on the Moon with the same effort (and at the speed and angle) that you would on Earth, the ball would land
one-sixth as far.
the same distance away.
6 times as far.
36 times as far.
Ignoring air resistance, the horizontal component of a projectiles velocity
remains constant.
is zero.
continuously increases.
continuously decreases.
Ignoring air resistance, the horizontal component of a projectiles acceleration
continuously decreases.
continuously increases.
is zero.
remains a non-zero constant.
If the acceleration vector of an object is directed anti-parallel to the velocity vector
the object is turning.
the object is slowing down.
the object is speeding up.
the object is moving in the negative x-direction.
If the acceleration of an object is always directed perpendicular to its velocity
this situation would not be physically possible.
the object is slowing down.
the object is speeding up.
the object is turning.
At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?
30o
60o
45o
0o
A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air resistance, when the bomb hits the ground the horizontal location of the plane will
be over the bomb.
be behind the bomb.
depend on the speed of the plane when the bomb was released.
be in front of the bomb.
A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the distance between the falling packages will
depend on their weight.
increase.
be constant.
decrease.
A bullet is fired horizontally, and at the same instant a second bullet is dropped from the same height. Ignore air resistance. Compare the times of fall of the two bullets.
The fired bullet hits first.
They hit at the same time.
The dropped bullet hits first.
cannot tell without knowing the masses
A ball is thrown with a velocity of 20 m/s at an angle of 60o above the horizontal. What is the horizontal component of its instantaneous velocity at the exact top of its trajectory?
17 m/s
10 m/s
zero
20 m/s