Question 1
1 / 1 pts
A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has a speed of
0 m/s
Correct!
6 m/s
3 m/s
4 m/s
Question 2
1 / 1 pts
The two measurements necessary for calculating average speed are
velocity and time
distance and acceleration
Correct!
distance and time
velocity and distance
acceleration and time
Question 3
1 / 1 pts
While a car travels around a circular track at a constant speed, its
velocity is zero
acceleration is zero
inertia is zero
Correct!
none of the above
Question 4
1 / 1 pts
A car's speed 3 seconds after accelerating from rest at 2 m/s2 is
Correct!
6 m/s
2 m/s
4 m/s
3 m/s
Question 5
1 / 1 pts
What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed of 20 m/s?
1 m/s^2
2 m/s^2
3 m/s^2
Correct!
4 m/s^2
5 m/s^2
Question 6
1 / 1 pts
The distance a freely falling bowling ball falls each second
Correct!
increases
is about 10 m
is about 5 m
none of the above
Question 7
1 / 1 pts
If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about
60 m
more than 200 m
Correct!
180 m
120 m
Question 8
1 / 1 pts
At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is
Correct!
60 m/s
100 m/s
25 m/s
55 m/s
50 m/s
Question 9
1 / 1 pts
An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as on Earth. In the first 5 seconds it falls a distance of
150 m
500 m
Correct!
250 m
100 m
none of the above
Question 10
1 / 1 pts
Which of the following is not a vector quantity?
acceleration
velocity
Correct!
speed
all are vector quantities
none are vector quantities
Question 11
1 / 1 pts
A bird flying at 8 km/h in a 6-km/h crosswind has a resultant speed of
6 km/h
14 km/h
Correct!
10 km/h
8 km/h
Question 12
1 / 1 pts
A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of
more than 20 km/h
20 km/h
Correct!
about 14 km/h
10 km/h
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