______________ is the largest known asteroid
a. Pluto
b. Mars
c. Ceres
d. Vesta
e. Mercury
c
Physics & Space Science
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The half-life of 30P is 2.50 minutes. If a sample of 30P has 
nuclei present, what is its activity?
a. 
b. 
c. 
d. 
e. 
Physics & Space Science
Predict the mass diffusivity of benzene, C6 H6, in air at 20ºC and 1 atm pressure using Equation 8-24. Compare this value to that from experimental values.
Physics & Space Science
A charge of 25 nC is uniformly distributed along a circular arc (radius = 2.0 m) that is subtended by a 90-degree angle. What is the magnitude of the electric field at the center of the circle along which the arc lies?
a. 81 N/C b. 61 N/C c. 71 N/C d. 51 N/C e. 25 N/C
Physics & Space Science
The seasons are caused by the precession of the Earth's axis
Indicate whether the statement is true or false
Physics & Space Science