Phys133 MidTerm#1
Extra short problem samples
1.
A binary system has a parallax p=0.1 arcsec.
a. What is it's distance in pc.
b. If the stars have an observed angular separation of a=1 arcsec,
what is their physical separation of the stars in AU?
2. How
long does it take a car traveling at a speed of v= 60 km/hr to travel a
distance d=120 km?
3. If ball is dropped from rest, then from earth's gravity, how fast is it moving after t=5
sec.
4. If a
car going a speed of
10 m/sec takes a time t=10 sec to stop, what is its mean
acceleration a, in m/sec^2?
5.. Consider a full size truck of mass m1=3000 kg traveling at a speed v1=20 m/sec,
and a compact car with mass m2=1000 kg traveling at a speed of v2= 40 m/sec?
a.
What is the ratio of their momentum, p2/p1?
b.
What is the ratio of the kinetic energy, E2/E1?
6. A planet obits a star at distance of d=2 AU over a period P= 4 years.
a. What is the circumference C of the orbit in AU?
b. What is the orbital speed V, in AU/yr.
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 Fall '08
 Staff
 Mass, Lsun, gravitational force change

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