What happens to the volume of a marshmallow when squeeze it?
a. Increases
b. Decreases
c. Remains constant
b. Decreases
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A box contains three cards, labeled 1, 2, and 3. Two cards are chosen at random, with the first card being replaced before the second card is drawn. Let X represent the number on the first card, and let Y represent the number on the second card.
a. Find the joint probability mass function of X and Y.
b. Find the marginal probability mass functions 
(x) and 
(y).
c. Find 
and 
.
d. Find 
.
e. Find Cov(X, Y).
Which of the following statements is correct?
A) Supply expansion policies lead to increases in output and decrease in the general price level. B) Demand expansion policies lead to increases in output and decrease in the general price level. C) Demand and supply policies move output and the general price level in the same direction. D) None of the above.
What is the purpose of the wetted media in an evaporative cooling system?
A) Water is moved across the wetted media to pretreat the air. B) Ammonia is moved across the wetted media. C) Water is absorbed by the wetted media to increase air temperature. D) Water evaporates from the wetted media, reducing the air temperature.
A separately excited DC motor has the following parameters:
Ra = 0.1 ? R f = 100 ? La = 0.2 H L f = 0.02 H Ka = 0.8 K f = 0.9 An inertial load has J = 0.5 kg-m2 and b = 2 N-m-s/rad. No external load torque is applied. a. Sketch a diagram of the system and derive the (three) differential equations. b. Sketch a simulation block diagram of the system (you should have three integrators). c. Code the diagram, using Simulink. d. Run the following simulations: Armature control. Assume a constant field with Vf = 100 V; now simulate the response of the system when the armature voltage changes in step fashion from 50 to 75 V. Save and plot the current and angular speed responses. Field control. Assume a constant armature voltage with Va = 100 V; now simulate the response of the system when the field voltage changes in step fashion from 75 to 50 V. This procedure is called field weakening. Save and plot the current and angular speed responses.