Test Review

A book is moved once around the perimeter of a tabletop with the dimensions 1.0 m × 2.0 m. If the book ends up at its original position, what is its displacement and what is the distance it traveled?

• displacement of 0 m, distance traveled 0 m

• displacement of 0 m, distance traveled 6 m

• displacement of 6 m, distance traveled 6 m

• 1.displacement of 6 m, distance traveled 0 m

A vector lies in the x-y plane. For what orientations will both components be positive?

• The vector lies between 180° and 270° from the x-axis.

• The vector lies between 0° and 90° from the x-axis.

• The vector lies between 90° and 180° from the x-axis.

• None. Just like for vector magnitudes, components are always positive.

Which of the following quantities, if any, remain constant as a projectile moves through its parabolic trajectory?

(i) speed

(ii) acceleration

(iii) the horizontal component of velocity

(iv) the vertical component of velocity

• (i) only

• (ii) and (iii)

• (ii) and (iv)

• all of them

As a projectile thrown upward at a non-vertical angle moves in a parabolic path, at what point along its path are the velocity and acceleration vectors for the projectile parallel to each other?

• at the point just before the projectile lands

• at the highest point

• at the launch point

• nowhere

Which of the following objects can't be accelerating?

• an object moving with a constant speed

• an object moving with a constant velocity

• none of the above

Consider the following controls in an automobile: gas pedal, brake, steering wheel. The control(s) that causes the car to accelerate are

• all three controls

• the gas pedal and the brake

• only the brake

• only the gas pedal.

A woman jogs along the dashed path from A to B in 20 seconds. What is the average speed of the woman?

• 3.50 m/s

• 2.50 m/s

• 3.50 s

• 2.50 s

What angles give the same horizontal range?

• supplementary angles

• complementary angles

• acute angles

• right angles

As a projectile moves in its parabolic path, the velocity and acceleration vectors are perpendicular to each other

• everywhere along the projectile's path

• at the peak of its path

• nowhere along its path

• not enough information is given

Lets say that during a thunder storm you measure the time lag between the flash and the thunderclap to be 3 seconds. If the speed of sound is about 340 m/s, which of the following is the best estimate of your distance to the lightening bolt?

• about 3 km

• about 0.3 km

• about 1 km

• about 10 km