Final Exam in Physics for Engineers

A box suspended by a rope is pulled to one side by a horizontal force. The tension in the rope

• is less than before

• is unchanged

• is greater than before

• may be any of the above, depending on how strong the force is

When the two vectors are added together, their resultant is a minimum when the angle between them is

• 0 degrees

• 45 degrees

• 90 degrees

• 180 degrees

A ship travels 200 km to the south and then 400 km to the west. The ship's displacement from its starting point is

• 200 km

• 400 km

• 450 km

• 600 km

An object is acted on by two forces of 20N each. The angle between the forces is 120 degrees. The resultant force on the object has the magnitude

• 20 N

• 28 N

• 34 N

• 40 N

A force F has the components F_{x and} F_y. The magnitude F_x of the force component in the x-direction is given by

A car travels at 20 km/hr for 1.5 h, at 30 km/hr for 2.0 hr, and at 40 km/hr for 0.75 hr. The car's average velocity is approximately

• 19 km/hr

• 21 km/hr

• 28 km/hr

• 30 km/hr

A car that starts from rest has a constant acceleration of 4 m/s² . In the first 3s the car travels

• 6 m

• 12 m

• 18 m

• 72 m

How long does a bicycle with an acceleration of 0.8 m/s² take to go from 4 to 12 m/s?

• 6.4 s

• 10 s

• 15 s

• 26 s

After a stone dropped from a cliff has fallen 20 m, the stone's velocity is

• 10 m/s

• 20 m/s

• 196 m/s

• 392 m/s

A ball is thrown downward at 6.0 m/s from a window 12.0 m above the ground. When it reaches the ground, the ball's velocity will be

• 9.3 m/s

• 15.3 m/s

• 21.3 m/s

• 52.8 m/s