A spaceship from another galaxy passes over the solar system directly above a radial line from the Sun to the Earth. (We measure that distance to be 1.5 × 10^11 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80c, for which ? = 5/3 . As measured on Earth it takes the spaceship 625 seconds to travel from the Sun to Earth. When a scientist in the spaceship measures the
Earth-Sun distance and the time it takes her to travel that distance, she finds the results are, respectively
a. 9.0 × 10^10 m; 375 s.
b. 9.0 × 10^10 m; 625 s.
c. 1.5 × 10^11 m; 625 s.
d. 2.5 × 10^11 m; 625 s.
e. 2.5 × 10^11 m; 1042 s.
a
You might also like to view...
A 100 eV electron and a 100 eV proton have equal de Broglie wavelengths
a. True b. False Indicate whether the statement is true or false
A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?
a. 83% b. 65% c. 43% d. 90% e. 56%
Carbon-14 Dating: An old bone sample contains 321 g of carbon and has an activity of 947 decays/min due to the carbon-14 in it. The half-life of carbon-14 is 5730 y. Assume that the activity of the atmospheric carbon is, and has remained, 0.255 Bq per gram of carbon.(a) How old is the sample?(b) What will be the activity of the sample 2000 y from now, in decays per minute?
What will be an ideal response?
An incompressible fluid is flowing through a horizontal pipe with a constriction. The velocity of the fluid in the wide section of the pipe is 5.00 m/s. The diameter of the wide section is 10.0 cm and the diameter of the narrow section is 8.00 cm. The pressure of the fluid in the wide section is 200 kPa. What is the pressure in the narrow section of the pipe? (density of the fluid is 680 
A. 188 kPa B. 175 kPa C. 160 kPa D. 152 kPa E. 148 kPa