RIO SALADO - PHY 111 MIDTERM 1

• | Page

RIO SALADO - PHY 111 MIDTERM 1

UPDATED ACTUAL EXAM WITH

CORRECT SOLUTIONS.

A student moves 8.0 m to the west, 6.0 m to the north, and 10.0 m to the east. What is the magnitude of the displacement? - correct answer- 6.3 m

Examine the position vs. time graph below. What is the velocity of the object at t = 5.0 s? - correct answer- -5 m/s

A student measures the mass of an object at 4.68 g and the volume of the object at 2.3 mL. The student calculates the density as 2.03478 g/mL. A second student disagrees with the density. Which of the following statements would explain why the second student disagrees? - correct answer- The number of decimals in the answer does not show proper precision.

Examine the position vs. time graph below. Which of the following correctly describes the motion of the object? - correct answer- Forwards at a constant speed and then backward at a constant speed

• / 3

• | Page

A car moving at a constant 25 m/s travels for 3.0 seconds.What is the distance traveled by the car? - correct answer- 75 m

A student measures the mass of an object at 4.68 g. Which of the following statements is most accurate? - correct answer- he first two digits are measured and the last digit is estimated.

A student models the constant speed motion of an object with

the following equation:

x = (4 m/s) t + (-15 m)

Which of the following descriptions of motion is consistent with this equation? - correct answer- The object starts at a negative position and travels forwards.

How much time will it take for an object traveling at a constant speed of 20 m/s to travel 15 m? - correct answer- 0.75 s

A student models the constant speed motion of an object with

the following equation:

• / 3

• | Page

x = (-2 m/s) t + (4 m)

Which of the following descriptions of motion is consistent with this equation? - correct answer- The object starts at a positive position and travels backwards.

Examine the velocity vs. time graph below. Which of the following correctly describes the motion of the object? - correct answer- Constant speed forwards and then constant speed backward

Convert 35.0 mph to m/s. (1 mi = 1.6 km) - correct answer- 15.6 m/s

Which of the following is a vector measurement? - correct answer- Displacement

Convert 4200 cm to miles. (1 mi = 1.6 km) - correct answer- 0.026 mi

A car travels forwards at a constant speed of 30 m/s for 5.0 seconds. How far will the car move in this time? - correct answer- 150 m

• / 3