Answer:
<em>Gold</em>
<em>Silver</em>
<em>Mixture</em>
Explanation:
<u>Density</u>
The density of an object of mass m and volume V is given by:
We are given the following densities:
Gold: 19.3 gr/cm3
Silver: 10.5 gr/cm3
With the data provided in the table, we can confirm which of the three columns corresponds to gold, silver, or a mix of both.
Calculating the first density: m1=1,930 gr, V1=100 cm3
This crown is made of gold
Calculating the second density: m2=1,930 gr, V2=184 cm3
This crown is made of silver
Calculating the last density: m3=1,930 gr, V3=150 cm3
Since the value of the density is between gold and silver, this crown is a mixture.
Density=Mass/Volume
Mass= Density*volume
Mass=1*10.5
Mass=10.5 grams
Answer:
Definition of direct current. : an electric current flowing in one direction only and substantially constant in value
Explanation:
Direct current (DC) is the one directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current.
Answer:
Therefore the direction is in the <u>positive direction of the z axes</u>.
Explanation:
Let's recall that the magnetic force is given by:
The unit vector of V is 
and the unit vector of B is 
So, the direction of the force will be defined as the cross product of i and j, and using the right hand rule:
Therefore the direction of the magnetic force is in the <u>positive direction of the z axes</u>.
I hope it helps you!
