A satellite moves east, taken as the positive x axis direction, at a speed of 0.5 c and a spaceship moves toward it (to the west) at a speed of 0.8 c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7 c
b. 0.21 c
c. ?0.21 c
d. 0.93 c
e. ?0.93 c
d
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You are standing on a sidewalk. There is a car in the distance. The horn on the car sounds. You hear it at a pitch that corresponds to a sound frequency lower than the frequency emitted by the horn. What can you conclude?
A) The wind has a component of its velocity in a direction toward you. B) The car is moving on a line directly away from your present location. C) The wind has a component of its velocity in a direction away from you. D) The car has a component of its velocity in a direction away from you. E) Either A or C must be true.
The splitting of a large nucleus into two smaller nuclei upon absorbing a neutron is nuclear fusion
a. True b. False Indicate whether the statement is true or false
What is the difference in meaning between the terms weather and climate?
A) Weather refers to local conditions, and climate refers to global conditions. B) Weather refers to short-term variations in conditions, and climate refers to long-term variations in conditions. C) Weather refers to small storms, and climate refers to large storms. D) Weather refers to wind and rain, and climate refers to processes like convection. E) There is no difference between weather and climate.
Angular Quantities: The sun subtends an angle of 0.00928 rad when viewed from the surface of the earth, and its distance from Earth is 1.5 × 1011 m. What is the diameter of the sun?
Fill in the blank(s) with the appropriate word(s).