How long does it take for the Moon to go from new phase to first-quarter phase?
About 7 3/8 days
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Mass on a Spring: A 1.5-kg cart attached to an ideal spring with a force constant (spring constant) of 20 N/m oscillates on a horizontal, frictionless track. At time t = 0.00 s, the cart is released from rest at position x = 10 cm from the equilibrium position.(a) What is the frequency of the oscillations of the cart?(b) Determine the maximum speed of the cart. Where does the maximum speed occur?(c) Find the maximum acceleration of the mass. Where does the maximum acceleration occur?(d) How much total energy does this oscillating system contain?(e) Express the displacement as a function of time using a cosine function.
What will be an ideal response?
What is the momentum of an electron moving at a speed of 0.90 c?
A. 
B. 
C. 
D. 
E. 
If the relative mass of a hydrogen atom is 1/4 that of a helium atom, how many hydrogen atoms would you need to equal the mass of four helium atoms?
A) 16 B) 4 C) 1/4 D) 25 E) 6.022 × 1023
Calculate
(a) Calculate the shortest wavelength EMR that has high tansmission through CdS. The energy gap in CdS is 2.25 eV. (b) Is a photon with energy 2.26 eV transmitted or absorbed? (c) Is a photon of energy 2.24 eV transmitted or absorbed?