A spaceship ferrying workers to moon-base I takes a straight-line path from the earth to the moon, a distance of 384,000 km. Suppose the spaceship starts from rest and
accelerates at 20 m/s2
, for the first 15 min of the trip, and then travels at constant velocity
until the last 15 min when it slows down at a rate of 20 m/s2
, just coming to rest as it
reaches the moon.
a) What is the maximum velocity attained? (Ans: 1.8 x 104
m/s)
b) What fraction of the total distance is traveled at constant speed? ( Ans: 95.78 % )
c) What total time is required for the whole trip?

The mantle is made up of which structural zones?

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?