<em>1) 26m/s</em>
<em>2) 69 m</em>
<em>Hi there !</em>
<em>1)</em>
<em>a = (v₂ - v₁)/t => at = v₂ - v₁ => v₂ = at + v₁</em>
<em>v₁ = 72km/h = 72000m/3600s = 20m/s</em>
<em>v₂ = 2m/s²ₓ3s + 20m/s</em>
<em>= 6m/s + 20m/s</em>
<em>= 26 m/s</em>
<em>2)</em>
<em>d = v₁t + at²/2</em>
<em>= 20m/sₓ3s + 2m/s²ₓ9s²/2</em>
<em>= 60m + 9m</em>
<em>= 69 m</em>
<em>Good luck ! </em>
Answer:
Explanation:
Given that,
Hot reservoir temperature is
TH = 58°C
TH = 58 + 273 = 331 K
Cold reservoir temperature
TC = -17°C
TC = -17°C + 273 = 256K
In 24minutes 590 J of heat was removed from hot reservoir
t = 24mins
t = 24 × 60 = 1440 seconds
Then,
Power is given as
P = E / t
P = 590 / 1440
P = 0.41 W
Since this removed from the hot reservoir, then, QH = 0.41W
We want to find heat expelled to the cold reservoir QX
Efficiency is given as
η = 1 - TH/TC = 1 - QH/QC
1 - TH/TC = 1 - QH/QC
TH/TC = QH/QC
Make QC subject of formula
QC = QH × TC / TH
QC = 0.41 × 256 / 331
QC = 0.317 W
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:))
310.686 miles is the correct answer
if rebecca stands in front of david at a distance of do and david perceives the position of rebecca at di, di will be +84 cm
<h3>What is focal length ?</h3>
How strongly light converges or diverges depends on an optical system's focal length, which is the inverse of optical power. A system with a positive focus length is said to converge light, whereas one with a negative focal length is said to diverge light.
focal length = +60 cm
magnification m = -0.40
focal length being positive an magnification negative.
given lens is a convex lens.
for a lens
m = di/do and 1/f = (1/di) - (1/do)di
= -0.4do1/f = (1/-0.4do) - 1/do do
= -210 cmdi = -0.4 * -210
di = +84 cm
To learn more about focal length go to - brainly.com/question/25779311
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