The total momentum of a flock of identical birds could be zero only if the birds are
A) taking off from the ground.
B) flying in the same direction.
C) flying in different directions.
D) very tired and coming down to rest.
Answer: C
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How is an X-ray burst (in an X-ray binary system) similar to a nova?
A) Both involve explosions on the surface of stellar corpse. B) Both typically recur every few hours to every few days. C) Both are thought to involve fusion of hydrogen into helium. D) Both result in the complete destruction of their host stars.
A puck with a mass m1 = 28.0 g moving at 1.00 m/s approaches a stationary puck with a mass m2 = 102 g on an air table and they undergo a two-dimensional elastic collision
As a result of their interaction, the incident puck moves away with a speed v1 = 0.785 m/s and the other puck moves away with a speed v2 in a different direction. What is the angle between the velocities v1 and v2? A) 45.0° B) 90.0° C) 85.0° D) 123° E) 165°
Three forces, 14.0 N, 25.0 N, and 20.0 N, are acting on a 9.6-kg object. Which of the following forces could also be acting on the object if it is moving with constant velocity?
a. 1.0 N b. 17 N c. 30 N d. 5.0 N e. any of the above
What is the difference between a concentration gradient and a density gradient?
What will be an ideal response?