00 g/cm air
solid
object
What is the mass of the object?
A 60.0 g
B 3840 g
C 4160 g
D 8000 g
The total weight of a gas-filled balloon is 1 500 N. The balloon rises at a constant speed
of 3m/s. What is the resultant force acting on the balloon during this ascent?
AON
B 500N
C 1500N
-D 450
​

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)