5. Mars has a mass of 6.4 x 102 kg and a radius of 3.4 x 10° m. (a) What is the escape velocity of a projectile launched from the surface of Mars? (b) If a projectile is somehow launched from the surface of Mars with a spced of 5200 m/s, what will its speed be when it is very far (r x) from Mars?

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Chapter8: Rotational Equilibrium And Dynamics
Section: Chapter Questions
Problem 73P: A cylinder with moment of inertia I1 rotates with angular velocity 0 about a frictionless vertical...
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can you help with number 5 sub parts a and b 

Constants:
G= 6.7 x 10 1 N-m2/kg?
9 = 9.8 m/s?
Moment of Inertia:
1=Emr I = MR Luak = Igitnder = MR Irat =
Iyphere =MR
Inerepp = MR Idisk = Ieyltnder
ML
4. Question 4) asked you which rolls down an inclined plane faster, a hoop or a solid cylinder if
both have the same mass and radius.
b) Explain your reasoning here,
5. Mars has a mass of 6.4 x 10 kg and a radius of 3.4 x 10° m.
(a) What is the escape velocity of a projectile launched from the surface of Mars?
(b) If a projectile is somehow launched from the surface of Mars with a speed of 5200 m/s,
what will its speed be when it is very far (r 0) from Mars?
6. A tennis ball (mass = 0.060 kg) is thrown horizontally from the top of a cliff, 10.0 m above
the base of the cliff, with an initial speed of 10.0 m/s. The tennis ball reachos the ground a
horizontal distance of 19.0 m from where it was thrown. Its speed when it hits the ground is
16.1 m/s.
(a) How much work is done by the gravitational force as it goes from the point of release,
r = (0, 10, 0) m, to the point where it hits the ground rf = (19.0, 0, 0) m?
(b) What is AK, the change in kinetie energy of the tennis ball from whon it was thrown
to when when it hits the ground?
(c) How much work is done by air resistance (i.e. friction) as the tennis ball moves from its
point of re- leasc to the point where it hits the ground?
7. Two cars collide at an intersection. Just before the collision, car A (mass
traveling north at 18 m/s and car B (mass
cars collide, they stick together.
1000 kg) is
= 1200 kg) is traveling east at 20 m/s. When the
(a) What is the common speed (magnitude of the velocity) of the two stuck-together cars
after the collision?
Transcribed Image Text:Constants: G= 6.7 x 10 1 N-m2/kg? 9 = 9.8 m/s? Moment of Inertia: 1=Emr I = MR Luak = Igitnder = MR Irat = Iyphere =MR Inerepp = MR Idisk = Ieyltnder ML 4. Question 4) asked you which rolls down an inclined plane faster, a hoop or a solid cylinder if both have the same mass and radius. b) Explain your reasoning here, 5. Mars has a mass of 6.4 x 10 kg and a radius of 3.4 x 10° m. (a) What is the escape velocity of a projectile launched from the surface of Mars? (b) If a projectile is somehow launched from the surface of Mars with a speed of 5200 m/s, what will its speed be when it is very far (r 0) from Mars? 6. A tennis ball (mass = 0.060 kg) is thrown horizontally from the top of a cliff, 10.0 m above the base of the cliff, with an initial speed of 10.0 m/s. The tennis ball reachos the ground a horizontal distance of 19.0 m from where it was thrown. Its speed when it hits the ground is 16.1 m/s. (a) How much work is done by the gravitational force as it goes from the point of release, r = (0, 10, 0) m, to the point where it hits the ground rf = (19.0, 0, 0) m? (b) What is AK, the change in kinetie energy of the tennis ball from whon it was thrown to when when it hits the ground? (c) How much work is done by air resistance (i.e. friction) as the tennis ball moves from its point of re- leasc to the point where it hits the ground? 7. Two cars collide at an intersection. Just before the collision, car A (mass traveling north at 18 m/s and car B (mass cars collide, they stick together. 1000 kg) is = 1200 kg) is traveling east at 20 m/s. When the (a) What is the common speed (magnitude of the velocity) of the two stuck-together cars after the collision?
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