Midterm Review

What is the train's speed with respect to the stationary observer?

• 40 mph

• 50 mph

• 10 mph

• 30 mph

Tags

NGSS.MS-PS3-1

What is the walker's speed from the observer's perspective?

• 10 mph

• 40 mph

• 50 mph

• 30 mph

Tags

NGSS.MS-PS3-1

What is the walker's speed with respect to the train?

• 30 mph

• 10 mph

• 40 mph

• 50 mph

A motorboat, which has a speed of 5 m/s in still water, is crossing a river (from west to east) The river's current is flowing south at 3.3 m/s. What is the magnitude of the boat’s resultant velocity with respect to the starting point?

• 3.3 m/s

• 5.0 m/s

• 6.0 m/s

• 8.3 m/s

A hiker walks 5 kilometers due north and then 7 kilometers due east. What is the hiker's resultant displacement?

• 2 km
• 8.6 km
• 12 km
• 12.6 km

If a car passes you in the left lane going 90 km/hr north while you are driving 80 km/hr north, how fast is the car moving relative to your car?

• 170 km/hr

• 90 km/hr

• 80 km/hr

• 10 km/hr

A passenger at the rear of a train traveling at 15 m/s relative to the ground throws a baseball with a speed of 15 m/s in the direction opposite the motion of the train. What is the velocity of the baseball relative to the ground as it leaves the thrower’s hand? In other words: how fast does a person on the ground see the ball move?

• 30 m/s

• 15 m/s

• 0 m/s

• 20 m/s

A woman on a bicycle travels at 9 m/s relative to the ground as she passes a little boy on a tricycle going in the opposite direction. If the boy is traveling at 1 m/s relative to the ground, how fast does the boy appear to be moving relative to the woman?

• 9 m/s

• 8 m/s

• 0 m/s

• 10 m/s

The Cheerios Nascar is racing around the track at 220 m/s, the Coke A Cola Nascar is speeding at 320 m/s. What is the magnitude of velocity of the Coke A Cola Nascar relative to the Cheerios Nascar?

• 100 m/s

• 320 m/s

• 540 m/s

• 0 m/s

A dog and a cat are at a stand-off, running towards each other, both at 12 m/s. What is the magnitude of velocity of the cat relative to the dog?

• 12 m/s

• 24 m/s

• 0 m/s

• 6 m/s