Plz answer this ASAP I need help
2 answers:
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Answer:
20 games.
Step-by-step explanation:
Given:
Meredith is playing games at an arcade to earn tickets that she can exchange for a prize.
She has 255 tickets from a previous visit.
She earns 6 tickets for each game she plays.
Meredith needs 375 tickets to exchange for the prize she wants.
Question asked:
How many games does Meredith need to play?
Solution:
Total tickets needed to exchange for the prize = 375
Meredith already have = 255 tickets
More tickets needed = 375 - 255 = 120 tickets
<u>By unitary method:</u>
She earns 6 tickets by playing = 1 game
She earns 1 ticket by playing = game
She earns 120 tickets by playing =
Therefore, she needs to play 20 games to earn 120 more tickets.
Answer:
The resulting power density is enough to melt the metal.
Step-by-step explanation:
Given data:
Power = P = 3000 J/sec
diameter = d = 3.5 mm
Solution:
As we Know that Area = A = π r² ---- (1)
where r is radius.
Also Radius =
Putting the values of radius, π = 3.14 in equation 1, we get
A = 3.14 x ()²
A = 3.14 x (3.5/2)²
A = 9.62 mm²
As 75% of heat is concentrated in circular area then Power P becomes
P = 3000 J/sec x 75 %
As J/sec = Watt = W and 75 % = 3/4
so P = 3000 W x 3/4
P = 2250 W
As power density is represented by the formula:
Power density = PD = P/A
where P is Power and A is area.
So,
PD = P/A
Putting the values of Power and Area in above equation, we get
PD = 2250 W / 9.62 mm²
PD = 234 W/mm²
So, this power density is sufficient to melt the metal.