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iren2701 [21]
3 years ago
13

Consider a grill with the lid closed to be a closed system. The propane provides chemical energy. The propane is ignited to prod

uce heat. The heat provides the thermal energy to cook the food in the grill. Which is true about the energy in this system? A. While some energy is destroyed and some is created, the total amount of energy is conserved. B. While the energy changes form from chemical to thermal, total energy is conserved. C. Chemical energy is destroyed in order to create thermal energy. D. While the energy changes form from chemical to thermal, the amount
Physics
1 answer:
katrin [286]3 years ago
6 0

'A' and 'C' talk about energy being created and destroyed.  That can't happen.

'D' trailed off in the middle, and we don't know WHAT it was talking about.

'B' is the only correct statement.


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1) A force of 157 N is applied to a box 25o above the horizontal. If it is applied over a distance of 14.5 m how much work is do
vfiekz [6]

#1

Work done is given by

W = F.d cos\theta

here we know that

F = 157 N

d = 14.5

\theta = 25^0

now from the above formula

W = (157)(14.5)cos25 = 2063.2 J

#2

By energy conservation

Initial total potential energy of egg = final total kinetic energy of egg

mgh = \frac{1}{2}mv^2

v = \sqrt{2gh}

v = \sqrt{2(9.8)(8.2)}

v = 12.7 m/s

#3

By momentum conservation we know that

m_1v_1 = (m_1 + m_2)v

215(9.5) = (215 + 19.7) v

v = \frac{215 (9.5)}{215 + 19.7}

v = 8.7 m/s

#4

by momentum conservation we know that

m_1v_1 + m_2v_2 = (m_1 + m_2) v

let direction of velocity of Jay Z car motion is positive direction

now we will say

1100(-20) + 1475v = (1100 + 1475)(7)

1475 v = 2575(7) + 1100(20)

v = 27.14 m/s

Yes Jay Z is overspeeding as his speed is more than speed limit

#5

Tension force in the string will be centripetal force

so here we can say

T = \frac{mv^2}{R}

here we know that

m = 0.63 kg

v = 7.8 m/s

R = 0.23 m

T = \frac{0.63 (7.8)^2}{0.23}

T = 166.6 N

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3 years ago
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kenny6666 [7]

Answer:

COOLING DOWN (AFTER WARM UP )

8 0
2 years ago
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