Two rockets approach each other. Each is traveling at 0.61c in the earth's reference frame. Part A What is the speed, as a fraction of c, of one rocket relative to the other? ΜΕ ΑΣΦ ? 3 20 F3 % 85 54 $ E R Submit Request Answer Provide Feedback FR t 96 FB & 7 8 9 Y U D F G H J K M 0

▾ Part A A starship voyages to a distant planet 10 ly away. The explorers stay 4.0 yr, return at the same speed, and arrive back on earth 26 yr after they left. Assume that the time needed to accelerate and decelerate is negligible. What is the speed of the starship? Express your answer using two significant figures. ΜΕ ΑΣΦ 20 Submit Request Answer Part B ? How much time has elapsed on the astronauts' chronometers? Express your answer using two significant figures. ΕΠΙ ΑΣΦ VAΣ ? t = Submit Request Answer years

the free-falling experiment is done on the moon stone dropped from height h=1m. after 1.1sec it hits the ground what is the gravity acceleration of the moon O a. 1.82m/s2 O b. 1.65m/s2 O c. 0.91 m/s2 O d. 3.3m/s2 O e. 2m/s2

R3M.8 The new earth-Pluto shuttle shuttle line boasts that it can take you between the two planets (which are about 5.0 hours of distance apart) in 2.5 hours (according to a rider’s watch). Assume that acceleration and deceleration periods are very brief so that you spend essentially all the trip traveling at a constant velocity. a) What time interval must synchronized clocks in the solar system’s reference frame register between the shuttle’s departure from earth and its arrival at Pluto if the advertisement is true? b) What is the shuttle’s cruising speed?

An astronaut journeys to a nearby star for 2.5 years according to his clock. When he returns, he finds that 7.5 years have elapsed. What was his speed?    Choices: A. 0.2 c B. 0.45 c C. 0.94 c D. 1.54 c

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a. What is vav,x for the interval from t = 0 to t = 3.60 s? answer in m/s b. What is vav,x for the interval from t = 0 to t = 3.50 s? anser in m/s

Subatomic particles called pions are created when protons, accelerated to speeds very near c in a particle accelerator, smash into the nucleus of a target atom. Charged pions are unstable particles that decay into muons with a half-life of 1.8 x 10-8 s. Pions have been investigated for use in cancer treatment because they pass through tissue doing minimal damage until they decay, releasing significant energy at that point. The speed of the pions can be adjusted so that the most likely place for the decay is in a tumor.Suppose pions are created in an accelerator, then directed into a medical bay 30 m away. The pions travel at the very high speed of 0.99995c. Without time dilation, half of the pions would have decayed after traveling only 5.4 m, not far enough to make it to the medical bay. Time dilation allows them to survive long enough to reach the medical bay, enter tissue, slow down, and then decay where they are needed, in a tumor. What is the half-life of a pion in the reference…

Subatomic particles called pions are created when protons, accelerated to speeds very near c in a particle accelerator, smash into the nucleus of a target atom. Charged pions are unstable particles that decay into muons with a half-life of 1.8 x 10-8 s. Pions have been investigated for use in cancer treatment because they pass through tissue doing minimal damage until they decay, releasing significant energy at that point. The speed of the pions can be adjusted so that the most likely place for the decay is in a tumor.Suppose pions are created in an accelerator, then directed into a medical bay 30 m away. The pions travel at the very high speed of 0.99995c. Without time dilation, half of the pions would have decayed after traveling only 5.4 m, not far enough to make it to the medical bay. Time dilation allows them to survive long enough to reach the medical bay, enter tissue, slow down, and then decay where they are needed, in a tumor. If the pion slows down to 0.99990c, about what…