A car moving at 10.0 m/s encounters a depression in the road that has a circular cross-section with a radius of 30.0 m. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression?
A) 200 N
B) 389 N
C) 789 N
D) 489 N
E) 589 N
C
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Why would the tidal forces around a black hole be of concern to a space explorer interested in investigating the area near a black hole?
What will be an ideal response?
Why is Titan considered a good candidate for life?
A) It has lakes and rivers of liquid methane and ethane that could support life as water does on Earth. B) Cassini measurements suggest it has an ocean of liquid water beneath its surface. C) There is evidence for several volcanic cones that likely erupt liquid water that is below Titan's frozen crust. D) All of the above
A satellite of mass m1 circles a planet of mass m2 and radius r in an orbit at a height 2r above the surface of the planet. What minimum energy is required to change the orbit to one for which the height of the satellite is 3r above the surface of the planet?
A.
B.
C.
D.
E.
A series of 3 uncharged concentric shells surround a small central charge q. The charge distributed on the outside of the third shell is
a. ?3q. b. ?(ln 3)q. c. +q. d. +(ln 3)q. e. +3q.