Simple Harmonic Motion: The position of an object that is oscillating on an ideal spring is given by x = (17.4 cm) cos[(5.46 s-1)t]. Write an expression for the acceleration of the particle as a function of time using the cosine function.
What will be an ideal response?
a = - (519 cm/s2) cos[(5.46 s-1)t]
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The wavelengths associated with thermal radiation at everyday temperatures are in the ________ spectral region.
A. infrared B. ultraviolet C. shorter visual D. longer visual E. x-ray
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the highest point, where 
is the normal force, 
is weight, and
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B.
C.
D.
E.
A proton moving along the x axis has an initial velocity of 4.0 × 10^6 m/s and a constant acceleration of 6.0 × 10^12 m/s2 . What is the velocity of the proton after it has traveled a distance of 80 cm?
a. 5.1 × 10^6 m/s b. 6.3 × 10^6 m/s c. 4.8 × 10^6 m/s d. 3.9 × 10^6 m/s e. 2.9 × 10^6 m/s
A surprising demonstration involves dropping an egg from a third-floor window to land on a foam-rubber pad 2 in (5 cm) thick without breaking. If a 56-gram egg falls 12 m, and the foam pad stops the egg in 6.25 ms, by how much is the pad compressed?