Which was one early problem with pendulum clocks?
a. Making sure the amplitude of the pendulum swing was accurate.
b. The tendency of the pendulum string to stretch.
c. Being able to know when it was the same time somewhere else in the world.
d. Devising a workable mechanism to supply the energy to keep the pendulum swinging.
e. Measuring how fast the sand or water moved through the clock.
d
You might also like to view...
These objects are no longer considered a good explanation for the dark matter in the halo
A) WIMPs B) MACHOs C) black holes D) clouds of cool, neutral hydrogen E) brown dwarfs
Doug hits a hockey puck, giving it an initial velocity of 7.0 m/s. If the coefficient of kinetic friction between ice and puck is 0.050, how far will the puck slide before stopping?
a. 19 m c. 37 m b. 25 m d. 50 m
At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/A)
A) 1.0 cm B) 2.0 cm C) 3.0 cm D) 4.0 cm E) 5.0 cm
Three bulbs have power ratings for use on a 120 volt line: 60 watt, 100 watt and 150 watt. The one with the largest value of resistance has power rating
A. 60 W. B. 150 W. C. 100 W. D. All of these choices have the same resistance