How long can a 1-solar-mass star live?
a. 0.5 solar lifetimes b. 1 solar lifetime
c. 2 solar lifetimes d. 10 solar lifetimes
b
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Alumina (Al2O3) is a(n) ______________material.
Fill in the blank(s) with the appropriate word(s).
Springs: A very light ideal spring with a spring constant (force constant) of 2.5 N/cm pulls horizontally on an 18-kg box that is resting on a horizontal floor. The coefficient of static friction between the box and the floor is 0.65, and the coefficient of kinetic friction is 0.45.(a) How long is the spring just as the box is ready to move?(b) If the spring pulls the box along with a constant forward velocity of 1.75 m/s, how long is the spring?(c) How long is the spring if it pulls the box forward at a constant 2.75 m/s?
What will be an ideal response?
If the inner accretion disk around a black hole has a temperature of 106 K, at what wavelength will it radiate the most energy? Hint: wavelength in nm =3,000,000/T in K
a. 106 nm b. 3 nm c. 3 x 106 nm d. 1 nm e. 3 x 1011 nm
Time Dilation: A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at 99.7% the speed of light. It is unstable, and is observed to decay in an average 37.0 ?s. If this particle were at rest in the laboratory, what would be its average lifetime?
A. 2.9 µs B. 18 µs C. 5.3 µs D. 12 µs E. 4.3 µs