A planet's size can be determined by observing its transit across a star
Indicate whether the statement is true or false
TRUE
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Your company has developed a new polymer, and you are asked to determine
(a) its elastic modulus and (b) its viscosity. To measure these properties, you choose to conduct a stress-relaxation test at 300 K. At 300 K a specimen of the new polymer is strained at t=0 by an amount of 3×10-3, and this requires an initial stress of 6×106 Pa. This strain is constant for 100 hours, and the stress on the polymer has dropped to 3×106 Pa. Assume that this polymer can be modeled as a Maxwell solid, with the viscous component behaving as a Newtonian fluid.
If a hydrogen atom in the ground state absorbs a 20.0 eV photon, what kinetic energy of the electron results?
A. this cannot happen B. 20.0 eV C. 13.6 eV D. 6.40 eV E. 33.6 eV
A uniform rod (mass = 1.5 kg) is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a horizontal position. What is the angular speed of the rod when the rod makes an angle of 30° with the horizontal? (The rotational inertia of the rod about the pin is 2.0 kg?m2).
A. 2.2 rad/s B. 3.6 rad/s C. 2.7 rad/s D. 3.1 rad/s E. 1.8 rad/s
Suppose you start with 1 kilogram of a radioactive substance that has a half-life of 10 years. Which of the following statements will be true after 20 years pass?
A) All the material will have completely decayed. B) You'll have 0.75 kilogram of the radioactive substance remaining. C) You'll have 0.25 kilogram of the radioactive substance remaining. D) You'll have 0.5 kilogram of the radioactive substance remaining.