A sample of sand initially at 22.2 °C absorbs 1364 J of heat. The final temperature of the sand is 67 °C. What is the mass (in g) of sand in the sample? The heat capacity of sand is 0.84

The mass of sand in the sample is 36.24 grams.

Explanation:

The equation used to calculate heat released or absorbed follows:

where,

q = heat absorbed = 1364 J

m = mass of sand = ?

c = heat capacity of sand = 0.84 J/g°C

= initial temperature = 22.2°C

= final temperature = 67°C

Putting values in above equation, we get:

Hence, the mass of sand in the sample is 36.24 grams.

Lincoln's Second Inaugural Address

Explanation:

Only 41 days before his assassination, President Abraham Lincoln took his second oath on 4th march, 1865. He addressed his nation in the inaugural ceremony where he told his plans for reuniting a divided nation. He reflected on the scourge of war which is a sin committed by both North and South America. Lincoln wanted his nation to learn from their mistakes and never indulge in war that risks the prosperity of mankind for centuries.