Metric Estimation
The mass of a paper clip is approximately
A) 1 × l06 kg
B) 1× l03 kg
C) 1 ×10–3 kg
D) 1 ×10–6 kg
c.) 1 ×10–3 kg
A speedometer in a car does not measure the car’s velocity because velocity is a
1.) vector quantity and has a direction associated with it
2.) vector quantity and does not have a direction associated with it
3.) scalar quantity and has a direction associated with it
4.) scalar quantity and does not have a direction associated with it
1.) vector quantity and has a direction associated with it
A person walks 10 meters. Could this represent their distance or displacement? Choose one and explain.
10 m represents a distance because displacement needs to have a direction.
Is it possible for average velocity to be negative? Why or why not?
Yes. Velocity is a vector. The negative sign on velocity indicates the object is travelling in the negative direction.
If a car accelerates from a velocity of 3 m/s to 12 m/s in 3 seconds, what is the car's average acceleration?
3 m/s2
The height of an individual step on a staircase is closest to
1.) 2 x 10 -2 m
2.) 2 x 10 -1 m
3.) 2 x 10 0 m
What is 2.) 2 x 10 -1 m
An airplane traveling north at 220 meters per second encounters a 50.0-meters-per-second crosswind from west to east.
What is the resultant speed of the plane?
1.) 170 m/s
2.) 214 m/s
3.) 226 m/s
4.) 270 m/s
3. 226 m/s
A runner competes in the 400 meter dash and finishes with a time of 64 seconds. If the track is a perfect oval, with the starting line and finish line at the same point, and the runner's average speed was 6.25 meters/second, what was the total distance travelled by the runner?
400 m
If Cole drives his car 30 m/s and travels a total of 98 m, for how long was he driving?
t = 3.3 s
How long does it take for a car to change its velocity from 10 m/s to 25 m/s if the acceleration is 5 m/s2?
3 seconds
The approximate mass of a nickel is
A) 0.0005 kg
B) 0.005 kg
C) 0.5 kg
D) 5 kg
B). 0.005 kg
A boat is traveling due east at a speed of 300 m/s. The wind is blowing at a speed of 35 m/s due south. Find the resultant speed and the angle at which the boat is directed.
302 m/s at an angle of 6.7 degrees south of east. OR an angle of 29.3 degrees east of south.
A hiker walks 5 km due north and then 7 km due east. What is the magnitude of her resultant displacement? What total distance did she travel?
displacement = 8.6 m
distance = 12 m
You start walking from a point on a circular field of radius 0.5 km and 1 hour later you return to the starting point.
What is your average speed for the whole journey? (in m/s)
What is your average velocity for the whole journey? (in m/s)
a) speed = 0.87 m/s
b) velocity = 0 m/s
What is the final velocity of a car starting at 5 m/s that accelerated at a rate of 7 m/s2 and traveled for 2.5 seconds?
22.5 m/s