A person riding a merry-go-round passes very close to a person standing on the ground once (event A) and then again (event B). Assume the ground is an inertial frame and that the rider moves at a constant speed. Which person’s watch measures a proper time ?? between events A and B?
A. The rider in the merry-go-round
B. The person standing on the ground
C. Both
D. Neither
C. Both
You might also like to view...
While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is
A) moving away from us. B) moving towards us. C) expanding explosively. D) blue shifted. E) not forming new stars.
The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
m and 
m/s.
?
The plane is most likely
A. just touching down. B. in level flight in the air. C. ascending. D. descending. E. taking off.
A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is
A) the same as the force on the 1-kg book. B) 5 times as much as the force on the 1-kg book. C) 10 times as much as the force on the 1-kg book. D) zero.
A sled weighs 160 N. It is held in place on a frictionless 25.0° slope by a rope attached to a stake at the top; the rope is parallel to the slope. What is the normal force of the slope acting on the sled?
a. 145 N b. 67.6 N c. 177 N d. 379 N e. 74.6 N