Tycho Brahe's greatest contribution to astronomy was
a. his model of the universe.
b. his telescopic observations.
c. his discovery of three laws of motion.
d. his 20 years of careful observations of the planets.
e. his model of the universe and his telescope observations.
d
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A 2.0 kg mass is moving in a circular path with a radius of 5.00 cm. The mass starts from rest and with constant angular acceleration, obtains an angular velocity of 6.00 rad/sec in 3.00 sec. The mass then comes to a stop with constant angular deceleration in 4.00 sec. The centripetal component of acceleration of the mass at 5.00 sec after the start is
A. 2.50 
B. 2.03
C. 1.25
D. 0.980
E. 0.456
The ________ is the totality of all space, time, matter, and energy
Fill in the blank(s) with correct word
If a monochromatic light beam with quantum energy value of 1.6 eV incident upon a photocell where the work function of the target metal is 0.9 eV, what is the maximum kinetic energy of ejected electrons?
a. 2.5 eV b. 1.8 eV c. 0.7 eV d. 3.2 eV e. 1.3 eV
Correctly position these four planets within the accretion disk of our early Solar System based on the materials that were present where they formed.
What will be an ideal response?