Answer:
Part 1. 4. 56 mi/h; Part 2. 7. 16 mi/h south; Part 3. 6. 56 mi/h north
Explanation:
Part 1. Average speed
Speed = distance/time
Distance = Austin-Waco + Waco-Austin + Austin-San Antonio
= 100 mi + 100 mi + 80 mi = 280 mi
Time = 5 h
Speed = 280 mi/5 h = 56 mi/h
Part 2. Average velocity
Velocity is a vector. It includes both speed and direction.
Assume south is positive and north is negative.
Distance = -100 mi + 100 mi + 80 mi = +80 mi
Velocity = +80 mi/5h = +16 mi/h = 16 mi/h south
Part 3. Average velocity Austin-Waco
Distance = north
If the student kept to an average speed of 56 mi/h, the average velocity was 56 mi/h north.
In a transverse wave the particles of the medium vibrate at right angles to the direction of wave travel.
In a longitudinal wave the particles of the medium vibrate parallel to the direction of wave travel.
A piano string exhibits transverse motion.
Sound in a fluid (air) travels as a longitudinal wave.
PE=1/2 mV^2
replace the values in the above formula, and you'll get your answer
Answer:
C. Ca₃N₅
Explanation:
A bond between a metal and a non-metal is called an ionic bond. The bond that occurs between two non-metals is called a covalent bond.
Let us check each option and determine the nature of the bond.
A. C₂H₆
This contains 2 carbon atoms and 6 hydrogen atoms. Both carbon and hydrogen are non-metals. So, a covalent bond exists between them
.
B. PCl₅
This contains 1 phosphorus and 5 chlorine atoms. Both phosphorus and chlorine are non-metals and hence, a covalent bond exists between them
.
C. Ca₃N₅
It has 2 calcium atoms and 5 nitrogen atoms. Here, calcium is metal and nitrogen is a non-metal. Hence, an ionic bond occurs between them.
D. SF₂
It has 1 sulfur and 2 fluorine atoms, both of them being non-metallic. So, covalent bonds are there between them.
From all the options, only option C has an ionic bond. So, option C is correct.
-- Water cannot be boled.
-- There is no such thing as a coffe aker.
-- There is no such thing as an immension-type heating element.
Be that as it may, and it very likely still is, as it were . . .
-- The latent heat of vaporization of water at 100°C is about 2250 kilo-joules per kg.
-- To evaporate half of the kg of water in the coffee maker requires 1125 kJ of heat energy.
-- To supply that amount of heat energy over a period of 10 minutes (600 seconds), it must be supplied at a rate of
(1,125,000 Joules / 600 seconds) = 1,875 joules/second.
-- That's 1,875 watts, or <em>1.875 kilowatts</em>.
-- <em>Choice-a</em> is the choice when the solution is rounded.