The quantity "pressure" expressed in terms of the fundamental quantities (mass, length, time) is equivalent to
a. MLT?1.
b. ML?1T?2.
c. M2L?1T?3.
d. a dimensionless quantity.
b
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An asteroid, of radius 2.1 km, is observed to have an escape speed equal to a typical person’s speed attained by jumping off, 3.0 m/s. What is its mass?
a. 
b. 
c. 
d. 
e. 
The directions of the velocity and acceleration of an object which is thrown straight upward and then falls back down (ignore the effects of air resistance) have the following characteristics:
A. the velocity and acceleration are always directed downward B. the velocity is always upward but the acceleration changes direction C. the velocity is always upward and the acceleration is always downward D. the velocity changes direction but theacceleration always stays the same
The chief hazard of radiation damage to living cells is
A) due to heating. B) due to ionization. C) due to the creation of chemical impurities. D) the creation of new isotopes within the body. E) the creation of radioactive material within the body.
A straight wire (length = 8.0 m) is bent to form a square. If the wire carries a current of 20 A, what is the magnitude of the magnetic field at the center of the square?
a. 17 ?T b. 14 ?T c. 11 ?T d. 20 ?T e. 36 ?T