Coins were developed as a medium of exchange because other items like cows, grain, and land were more difficult to move from place to place.

A tea kettle is warmed on an electric stove. After a while, water vapor builds inside the kettle and causes a whistle in the lid to make a sound. How does this demonstrates the first law of thermodynamics?

Brass is an alloy of copper and zinc the two metals are melted mixed and then solidified how would you best classify brass

A steel block has a volume of 0.08 m 3 and a density of 7,840 kg/m 3. What is the force of gravity acting on the block (weight) in water? A) 6,700.56 N B) 6,150.64 N C) 7,600.18 N D) 5,362.56 N

What type of system allows matter and energy to enter and exit? A. Closed B. Open C. Isolated D. Connected

34.6 cL = (blank) hL convert

If a 75 W lightbulb operates at a voltage of 120 V, what is the current in the bulb?* A. 1.6A B. 9000 A C. 195 A D. 0.63 A

A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. Long after contact is made with the battery (a) the voltage across the capacitor is A) equal to the battery's terminal voltage.

A beam of electrons with a speed of is incident on a slit of width 200. nm. The distance to the detector plane is chosen such that the distance between the central maximum of the diffraction pattern and the first diffraction minimum is 0.300 cm.

Which element has the greatest number of valence electrons? O A. Phosphorus (P) OB. Oxygen (0) O C. Sodium (Na) O D. Magnesium (Mg)

Let r =.07 be the reserve rate. Which of the following is the money multiplier?