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 lowest point, where
is the normal force, 
) is weight, and
is tension?
a.
b.
c.
d.
e.
b
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Consider the following processes: The temperature of two identical gases are increased from the same initial temperature to the same final temperature. Reversible processes are used. For gas A the process is carried out at constant volume while for gas B it is carried out at constant pressure. The change in entropy:
A. is the same for A and B B. is greater for A C. is greater for B D. is greater for A only if the initial temperature is low E. is greater for A only if the initial temperature is high
To determine boundary-layer characteristics on a body, we must first know the potential-flow solution. The information used from the potential-flow solution is:
(A) The lift and drag acting on the body (B) The pressure and velocity at the boundary of the body (C) The shearing stress acting on the boundary of the body (D) The normal and shearing stress acting on the boundary of the body
For constant-volume processes the heat capacity of gas A is greater than the heat capacity of gas B. We conclude that when they both absorb the same energy as heat at constant volume:
A. the temperature of A increases more than the temperature of B B. the temperature of B increases more than the temperature of A C. the internal energy of A increases more than the internal energy of B D. the internal energy of B increases more than the internal energy of A E. A does more positive work than B
What types of events ended the Paleozoic era?
What will be an ideal response?