Astronaut Rob leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. Rob's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year)
Relative to a frame of reference that is fixed with respect to Earth, how long does it take Rob to complete the trip? A) 14.4 years
B) 15.0 years
C) 10.8 years
D) 4.20 years
E) 22.7 years
B
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A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?
A) g downward B) 2 g upward C) 0.5 g downward D) g upward E) 2 g downward
A uniform rod (mass = 2.0 kg, length = 0.60 m) is free to rotate about a frictionless pivot at one end. The rod is released from rest in the horizontal position. What is the magnitude of the angular acceleration of the rod at the instant it is 60° below the horizontal?
a. 15 rad/s2 b. 12 rad/s2 c. 18 rad/s2 d. 29 rad/s2 e. 23 rad/s2
Answer the following statement(s) true (T) or false (F)
If a complex number is equal to its own complex conjugate, then the complex number is real
The Pioneer probes carry what kind of physical time capsule?
A) a small engraved plaque B) a gold-plated record containing pictures, multilingual greetings and music C) a DVD containing pictures D) these probes do not carry a physical time capsule