An old LP record that is originally rotating at 33.3 rad/s is given a uniform angular acceleration of 2.15 rad/s2. Through what angle has the record turned when its angular speed reaches 72.0 rad/s?
A) 83.2 rad
B) 316 rad
C) 697 rad
D) 66.8 rad
E) 948 rad
E
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A car passes a dip in the road, going first down, then up. At the very bottom of the dip, when the car’s instantaneous velocity is passing through horizontal, how does the magnitude of the normal force on the car compare to the magnitude of the car’s weight?
A. 
B. 
C. 
D. 
E. We do not have enough information to answer.
Because of the great masses and speeds involved, Newton's laws are useless in measuring the mass of a galaxy
Indicate whether the statement is true or false
Cubes of sugar, 1 cm on a side, are placed in water at 25ºC. Estimate the time before the lumps have dissolved; that is, when the sugar concentration at the lump is 10% by weight. Assume that the diffusivity of sugar into water is 6.9 x 10^-10m^2/s, the convective mass transfer coefficient is 6.4 x 10^-6m^2/s, and the self-diffusivity of sugar is 1 x 10^-5m^2/s. The density of sugar may be taken as 1500 kg/m^3.
What will be an ideal response?
If a star has a mass of 10 solar masses and a luminosity of 10,000 solar luminosities, how long is its lifetime? (The Sun's lifetime is 10 billion years.)
A) 100 billion years B) 10 million years C) 1 million years D) 100 trillion years