In Part A, you found that Planet Z should not have polar ice caps or liquid water. What single change to Planet Z's characteristics would allow it to have these things?
a. a larger size
b. a larger axis tilt
c. a greater distance from its star
d. a smaller size
Answer : c. a greater distance from its star
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Uniform Circular Motion: In a carnival ride, passengers stand with their backs against the wall of a cylinder. The cylinder is set into rotation and the floor is lowered away from the passengers, but they remain stuck against the wall of the cylinder. For a cylinder with a 2.0-m radius, what is the minimum speed that the passengers can have so they do not fall if the coefficient of static friction between the passengers and the wall is 0.25?
A. 8.9 m/s B. 2.3 m/s C. 3.0 m/s D. 4.9 m/s E. It depends on the mass of the passengers.
The Saturnian moons of most interest to exobiologists are
A) Rhea and Iapetus. B) Phoebe and Dione. C) Mimas and Tethys. D) Hyperion and Miranda. E) Titan and Enceladus.
Uniform Circular Motion: A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m. The ball makes 2.0 revolutions every 1.0 s.(a) What are the magnitude and direction of the acceleration of the ball?(b) Find the tension in the string.
What will be an ideal response?
A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the Moon, 384,000 km away. What is the radius of the big red spot on the Moon?
A. 500 m B. 250 m C. 120 m D. 1.0 km E. 2.7 km