A moving particle is subject to conservative forces only. When its kinetic energy decreases by 10 J, what happens to its mechanical energy?
a. It increases by 10 J.
b. It decreases by 10 J.
c. It increases, but not necessarily by 10 J.
d. It decreases, but not necessarily by 10 J.
e. It remains the same.
e
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Each rolling wheel of a railroad train is tapered. Compared with the wide part, the narrow part of the wheel has a tangential speed that is
A) less. B) greater. C) the same for both.
A rod attached to the shaft of a motor at the center of the rod so that the rod is perpendicular to the shaft, as in figure a. The motor is turned on and performs work W on the rod, accelerating it to an angular speed ?. The system is brought to rest and the attachment to the rod is then moved along the shaft such that the rod is spun from its end instead, as in figure b. If the controls of the
motor are adjusted such that the rod is accelerated from rest to the same angular speed of ? in this new configuration, how much work does the motor do on the rod in this case?
An Earth observer sees a spaceship at an altitude of 920 m moving downward toward the Earth at a speed of 0.690c. What is the spaceship's altitude as measured by an observer in the spaceship?
a. 1270 m b. 512 m c. 1650 m d. 666 m e. 635 m
A level pipe contains a nonviscous, incompressible fluid with a density 1200 kg/m3 that is flowing irrotationally. At one position within the pipe, the pressure is 300 kPa and the speed of the flow is 20.0 m/s
At another position, the pressure is 200 kPa. What is the speed of the flow at this second position? A) 567 m/s B) 16.2 m/s C) 32.9 m/s D) 23.8 m/s E) 186 m/s