Seismic waves that travel through our planet are called ______________ waves
a. Earth
b. planet
c. body
d. ground
c
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Captain Jirk reports to headquarters that he left the planet Senesca 1.88 × 104 seconds earlier. Headquarters sends back the message: "Was that spaceship proper time?" It will be spaceship proper time if it was
A. measured by one clock fixed at one spot on Senesca. B. measured by one clock fixed at one spot on the spaceship. C. measured by a clock on Senesca at departure and by a clock on the spaceship when reporting. D. measured by a clock on the spaceship when departing and by a clock on Senesca when reporting. E. calculated by dividing the distance from Senesca according to Senesca by the speed of the spaceship.
Under what conditions is an object weightless? (Ignore effects of air resistance.)
A) when it is in free-fall B) when it is on the Moon C) when it is detached from Earth's surface (such as in an airplane) D) when it is moving in at constant velocity
A diffraction grating has 450 lines per mm. What is the highest order m that contains the entire visible spectrum from 400 nm to 700 nm?
A) m = 2 B) m = 3 C) m = 4 D) m = 5 E) m = 6
What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
a. 980 N b. 200 N c. 98 N d. 49 N e. Some value other than those given above.