Sample Problems for Quiz #1

The displacement of an object for a round trip between two locations ( A is always greater than zero B Is always less than zero? C Is zero. D Can be greater than or less than but not equal to zero. E Can have any value. )

Is zero

In mechanics, physicists use three basic quantities to derive additional quantities. Mass is one of the three quantities. What are the other two? ( A length and force B power and force C length and time D force and time )

length and time

An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the average velocity of the object? ( A 0.50 m/s B 0.50 m/s C 0.73 m/s D 0 m/s )

0 m/s

A truck moves 70 m east, then moves 120 m west, and finally moves east again a distance of 90 m. If east is chosen as the positive direction, and if the truck took a total time of 4.0s, what is the average velocity? ( A 40 m/s B -40 m/s C 28m/s D 10 m/s )

10 m/s

An automobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 10.0 s. What distance does the car travel? ( A 150 m B 196 m C 336 m D 392 m )

150 m

A ball is pushed with an initial velocity of 4.0 m/s. The ball rolls down a hill with a constant acceleration of 1.6 m/s2. The ball reaches the bottom of the hill in 8.0 s. What is the ball's velocity at the bottom of the hill? ( A 10 m/s B 12 m/s C 16 m/s D 17 m/s )

17 m/s

You drive for 30 min at 25 m/s and then took a 15 min break you then drive for 45 min at 20 m/s. Your average speed for the entire trip is ( A 18.3 m/s B 22m/s C 20m/s D None of the above )

18.3 m/s

A car, starting from rest, accelerates in a straight-line path at a constant rate of 2.5 m/s^2. How far will the car travel in 12 seconds? ( A 180m B 120m C 30m D 15m )

180m

Multiplying a 2 significant figure number by a 3 significant figure number and then dividing the product by a six significant figure number yields a number with how many significant figures? ( A 5/6 B 1 C 2 D 11 )

2

A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 s. What is the final velocity after 11 s? ( A 1.8 m/s B 3.2 m/s C 5.1 m/s D Zero )

5.1 m/s

When a car reaches a velocity of 60 m/s, it decelerates to -7.5 m/s2 and makes its velocity to zero. What displacement it took during this deceleration period? ( A. 40 m B. 80 m C. 160 m D. 240 m )

240 m

A European sports car dealer claims that his car will accelerate at a constant rate from rest to 30m/s in 8.00 s. If so, what is the acceleration? ( A 3.75 m/s2 B 6.82 m/s2 C 11.4 m/s2 D 17.4 m/s2 )

3.75 m/s2

A railroad train travels forward along a straight track at 80.0 m/s for 1000 m and then travels at 50.0 m/s for the next 1000 m. What is the average velocity? ( A 65.0 m/s B 61.5 m/s C 63.7 m/s D 70.0 m/s )

61.5 m/s

A cart is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s2. What is the magnitude of the cart's displacement during the first 6.0 s of its motion? ( A 10 m B 55 m C 66 m D 80 m )

66 m

A particle moves from Xl = -50 cm to X2 = 30 cm. The displacement of this particle is ( a. -50 cm b. 30 cm c. 80 cm d. -30 cm e. -80 cm )

80 cm

The area under velocity versus time graph is: ( A. Impulse B. Work C. Displacement D. None of the above )

Displacement

Two children start at one end of a street, the origin, run to the other end, then head back. On the way back Joan is a head of Mike. Which statement is correct about the distances run and the displacements from the origin? ( A Joan has run a greater distance and her displacement is greater than Mike's B Mike has run a greater distance and his displacements is greater than Joan's C Joan has run a greater distance, but her displacement is less than Mike's D Mike has run a shorter distance , and his displacement is less than Joan's )

Joan has run a greater distance, but her displacement is less than Mike's

The displacement of an object for a round trip between two locations maybe

Zero or non-zero