Q 1 If two particles have equal kinetic energies, are their momentanecessarily e
ID: 1724952 • Letter: Q
Question
Q 1
If two particles have equal kinetic energies, are their momentanecessarily equal?Explain.
Q 2
Where is the center of mass of Earth's atmosphere?
Q 3
An airplane propeller is rotating at 1900 rev/min.Compute thepropeller's angular velocity inrad/s.
Q 4
Two ice dancers are at rest on the ice, facing each other withtheir hands together. They push off on each other in order to seteach other in motion. The subsequent momentum change (magnitudeonly) of the two skaters will be ____. Also write it’s (theanswer you choose) detail reason.
A. greatest for the skater who is pushed upon with the greatestforce
B. greatest for the skater who pushes with the greatestforce
C. the same for each skater
D. greatest for the skater with the most mass
E. greatest for the skater with the leastmass
Q 5
How much work is done by an applied force to lift a 20-Newtonblock 2.0 meters vertically at a constantspeed?
Q 6
Explanation / Answer
The student weighs 490 N (Fgrav= 50 kg * 9.8m/s/s).
To lift a 490-Newton person at constant speed, 490 N offorce must be applied to it (Newton's laws). The force is up, thedisplacement is up, and so the angle theta in the work equation is0 degrees. Thus,
W = (490 N) * (8 m) * cos (0 degrees) =3920 Joules
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