The Bohr model correctly predicts the energy for the ground state of the hydrogen atom
Indicate whether the statement is true or false
TRUE
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An astronaut in orbit around Earth drops her pen, and it floats gently next to her hand. Why does it not fall to the floor?
A. There is no gravity in space. B. The net force on the pen is zero. C. The gravitational pull is very weak at typical altitudes for orbiting spacecraft. D. Objects in orbit have no mass. E. All objects in the spacecraft are falling toward Earth at the same rate.
The half-life of 131I is 8.04 days. Three days after it was prepared, its activity was 0.50 mCi. How many curies (in mCi) were initially prepared?
a. .60 b. .70 c. .65 d. .55 e. .39
Contrast the orbital eccentricity and axial tilt of Jupiter and Saturn
What will be an ideal response?
A uniform rod of length (L = 2.0 m) and mass (M = 1.5 kg) is pivoted about a horizontal frictionless pin through one end. The rod is released from rest at an angle of 30° below the horizontal. What is the angular speed of the rod when it passes through the vertical position? (The rotational inertia of the rod about the pin is 2.0 kg/m2.)
a. 3.5 rad/s b. 2.7 rad/s c. 3.1 rad/s d. 2.3 rad/s e. 1.6 rad/s