a.) Two balls make up a closed system. Ball A has 421 J of energy and ball B has

Question

a.) Two balls make up a closed system. Ball A has 421 J of energy and ball B has 304 J. After they collide, ball A has 514 J. How much energy does ball B have after they collide?
J

b.) An asteroid and a comet collide head on. Prior to the collision, the asteroid has a momentum of 200,000 kg·m/s down and the comet has a momentum of 300,000 kg·m/s up. After the collision the asteroid has a momentum of 550,000 kg·m/s down. After the collision, what is the comet's momentum?
kg·m/s
North
South
East
West
Up
Down
Left
Right
No direction because the comet has stopped

c.) How much does a 96 kg object weigh on Venus? Please feel free to reference the Solar System Data table located at the beginning of Unit II.
N

d.) A 800 N net force acts on a 30 kg object. Determine the object's acceleration.
m/s2

e.) Calculate the gravitational force between a 653 kg object (resting on Earth) and the Moon. The mass of the Moon is 7.347×1022 kg and the distance between the object & the Moon is 3.844×108 m.
N

Explanation / Answer

a) by energy conservation total energy before collision = total energy after collision 421+304=514+x x=211 = energy of B b) momentum conservation 550,000-200,000=300,000+x (using vector addition) x=50,000 up c) g on venus = 8.83 m/s^2 weight = mg = 847.68 N d) F=ma 800 = 30 m m= 26.67 kg e)f= (G m1 m2)/r^2 f= 0.022N after putting the values

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