True or False: Because the speed of a particle cannot exceed the speed of light, there is an upper limit to its momentum and kinetic energy
1.True
2.False
2
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Consider a hoop of radius R and mass M rolling without slipping. Which form of kinetic energy is larger, translational or rotational?
A) Translational kinetic energy is larger. B) Rotational kinetic energy is larger. C) Both are equal. D) You need to know the speed of the hoop to tell. E) You need to know the acceleration of the hoop to tell.
The dimensionless ratio U?/?Lg , called Froude number, is a measure of similarity between an ocean-going ship and a scale model of the ship to be tested in a laboratory water channel. A 150 m long cargo ship is designed to run at 36 km/h, and a 1.5 m geometrically similar model is towed in a water channel to study wave resistance. What should be the towing speed in m s–1?
A ship model and its prototype
Froude number = U? /?Lg is a measure of similarity
Ship length (Ls) = 150 m
Ship speed (U?s) = 20 knots
Model length (Lm) = 1.5 m
FIND
Model towing speed (U?m)
SKETCH
When it is 12 noon, May 6, in Perth, Australia (33°S, 116°E), what are the standard time and date in Ottawa, Canada (44°N, 76°W)?
From the mass-luminosity relation, a 2 solar mass star on the main sequence would have a luminosity of approximately ____ solar luminosities
a. 2 b. 4 c. 11 d. 0.5 e. 0.25