Predict/Calculate The starships Picard and La Forge are traveling in the same direction toward the Andromeda galaxy. The Picard moves with a speed of 0.90 c relative to the La Forge A person on the La Forge measures the length of the two ships and finds the same value. (a) If a person on the Picard also measures the lengths of the two ships, which of the following is observed; (i) the Picard is longer; (ii) the La Forge is longer; or (iii) both ships have the same length? Explain. (b) Calculate the ratio of the proper length of the Picard to the proper length of the La Forge .
Predict/Calculate The starships Picard and La Forge are traveling in the same direction toward the Andromeda galaxy. The Picard moves with a speed of 0.90 c relative to the La Forge A person on the La Forge measures the length of the two ships and finds the same value. (a) If a person on the Picard also measures the lengths of the two ships, which of the following is observed; (i) the Picard is longer; (ii) the La Forge is longer; or (iii) both ships have the same length? Explain. (b) Calculate the ratio of the proper length of the Picard to the proper length of the La Forge .
Predict/Calculate The starships Picard and La Forge are traveling in the same direction toward the Andromeda galaxy. The Picard moves with a speed of 0.90c relative to the La Forge A person on the La Forge measures the length of the two ships and finds the same value. (a) If a person on the Picard also measures the lengths of the two ships, which of the following is observed; (i) the Picard is longer; (ii) the La Forge is longer; or (iii) both ships have the same length? Explain. (b) Calculate the ratio of the proper length of the Picard to the proper length of the La Forge.
Steel train rails are laid in 13.0-m-long segments
placed end to end. The rails are laid on a winter
day when their temperature is -6.0° C.
Part A
How much space must be left between adjacent rails if they are just to touch on a summer day when their
temperature is 32.0°C?
Express your answer with the appropriate units.
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D =
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Part B
If the rails are originally laid in contact, what is the stress in them on a summer day when their temperature is
32.0°C?
Express your answer in pascals. Enter positive value if the stress is tensile and negative value if the
stress is compressive.
F
A
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help me with this and the step I am so confused. It should look something like the figure i shown
Part A
In an effort to stay awake for an all-night study
session, a student makes a cup of coffee by first
placing a 200 W electric immersion heater in
0.250 kg of water.
How much heat must be added to the water to raise its temperature from 20.5° C to 95.0°C?
Express your answer in joules.
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Part B
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How much time is required? Assume that all of the heater's power goes into heating the water.
Express your answer in seconds.
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