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S18 Ph 121 Chaper 13 Practice 2

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Richard Datwyler

on 17 July 2018

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Transcript of S18 Ph 121 Chaper 13 Practice 2

Chapter 13 Practice 2
Orbits and Energy

A starship is circling a distant planet of radius R. The astronauts finds that the free-fall acceleration at their altitude is half the value at the planets surface. How far above the surface are they orbiting?
.41 R
A projectile is shot straight up from the earth's surface at a speed of 10,000 km/h. How high does it go?
394 km
418 km
(compare to flat earth)
What then is the escape velocity from earth?
11,191 m/s
the moon?
60,217 m/s
2,375 m/s
617,590 m/s
Nothing can escape the event horizon of a black hole, not even light. You can think of the event horizon as being the distance from a black hole at which the escape speed is the speed of light, 3.00 × 10 m/s, making all escape impossible. What is the radius of the event horizon for a black hole with a mass 6.5 times the mass of the sun? This distance is called the Schwarzschild radius.
19,173 m
The asteroid belt circles the sun between the orbits of Mars and Jupiter. One asteroid has a period of 5.0 earth years.
What is the asteroid's orbital radius?
What is the asteroid's orbital speed?
4.37 x 10^11 m
17,400 m/s
Three satellites orbit a planet of radius R, as shown in the figure. Satellites S1 and S3 have mass m. Satellite S2 has mass 2 m. Satellite S1 orbits in 280 minutes and the force on S1 is 10,000 N. What are all the periods and forces on the other satellites?
280 m 514 m
20,000 N 4,440 N
Two Jupiter-size planets are released from rest 1 x 10^11 m apart. What are their speeds as they crash together?
30,000 m/s
angular momentum
rotational energy
center of mass
angular kinematics
angular dynamics
moments of inertia

Gravitational force
Gravitational acceleration
Gravitational energy

Can we do Question one from mastering physics? I haven't been able to figure out what I'm doing wrong.
Planet Z is 6000 km in diameter. The free-fall acceleration on Planet Z is 10.0 m/s2 .
What is the free-fall acceleration 1.00×104 km above Planet Z's north pole?
.53 m/s^2
1.3 x 10^24 kg
How can something have negative energy?
What is the difference between orbital and escape velocity?
could you explain periods of orbit a bit more.
What is the ratio of the sun's gravitational force on you to the earth's gravitational force on you?
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