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alex41 [277]
2 years ago
5

for a certain chemical reaction, the reactants contain 52 kj of potential energy and the products contain 32 kj how much energy

is absorbed or released by the reaction. A.84 kj is released B.20 kj is released C. 20 kj is absorbed D.84 kj is absorbed
Physics
2 answers:
Luden [163]2 years ago
7 0
B, is the answer. (20 kj is released)
mojhsa [17]2 years ago
4 0

Answer:

B. 20 kj is released

Explanation:

A.P.E.X. CST

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Q3. A man walks with a speed of 8 m/sec in 40 sec. How much distance was covered?
chubhunter [2.5K]

Answer:

it is320 m.

Explanation:

by formula

d= m/s×t

d= 8× 40

d=320 m

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2 years ago
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If you were to drop a rock from a tall building, assuming that it had not yet hit the ground, and neglecting air resistance, how
taurus [48]
T=2s
g=10m/s2
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3 0
3 years ago
A 0.290 kg potato is tied to a string with length 2.50 m, and the other end of the string is tied to a rigid support. The potato
Sergeu [11.5K]

Answer:

A) The speed of the potato at the lowest point of its motion is 7.004 m/s

B) The tension on the string at this point is 8.5347 N

Explanation:

Here we have that the height from which the potato is allowed to swing  is 2.5 m

Therefore we have ω₂² = ω₁² + 2α(θ₂ - θ₁)

Where:

ω₂ = Final angular velocity

ω₁ = Initial angular velocity = 0 rad/s

α = Angular acceleration

θ₂ = Final angle position

θ₁ = Initial angle position

However, we have potential energy of the potato

= Mass m×Gravity g× Height h

= 0.29×9.81×2.5 = 7.1125 J

At he bottom of the swing, the potential energy will convert to kinetic energy as follows

K.E. = P.E. = 7.1125 J

1/2·m·v² = 7.1125 J

Therefore,

v² = 7.1125 J/(1/2×m) = 7.1125 J/(1/2×0.290) = 49.05

∴ v = √49.05 = 7.004 m/s

B) Here we have the tension given by

Tension T in the string = weight of potato + Radial force of motion

Weight of potato = mass of potato × gravity

Radial force of motion of potato = mass of potato × α,

where α = Angular acceleration = v²/r and r = length of the string

∴ Tension T in the string = m×g + m×v²/r = 0.290×(9.81 + 7.004²/2.5)

T = 8.5347 N

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3 years ago
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Can a body having larger mass be hotter than another of smaller mass.expalain​
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Answer:

it would make sense because a larger body could produce more body heat.

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A system consists of two particles. Which of the following scenarios would the force on each particle increase the most? If mult
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Answer:

c

Explanation:

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