On a P-V diagram, if a process involves a closed curve, the area inside the curve represents:
a. internal energy.
c. work.
b. heat.
d. zero.
C
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How do we know where comets come from?
How do we know where comets come from?
- The comets from the Oort cloud don’t produce a tail, but those from the Kuiper belt do
- Those that come from the Kuiper belt are composed of slightly different materials than those from the Oort cloud
- Astronomers only guess where these comets come from, they don’t know for sure
- The comets from the Oort cloud travel at much greater velocities than those from the Kuiper belt
- The comets from either location have a trajectory or pathway that can be traced back to their starting point once we see them
If distance is speed × time and light takes 8 minutes to travel from the Sun to Earth and over 4 hours to travel from the Sun to the planet Neptune, what is the distance from the Sun to Neptune?
a. 5 AU b. 30 AU c. 30 ly d. 5 ly e. 0.6 ly
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 
acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the tangential velocity of a point 4.0 cm from the center at the time 25.0 seconds from the start?
a. 
b. 
c. 
d. 
e. 
A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?
a. 39 N b. 20 N c. 44 N d. 0 N e. 30 N