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Gekata [30.6K]
3 years ago
14

How much heat is absorbed by a 35g iron skillet when its temperature rises from 14oC to 79oC? Joules

Physics
1 answer:
Pavlova-9 [17]3 years ago
7 0
Data:
Q (Amount of heat) = ?(in Joule)
m (mass) = 35 g
c (Specific heat of iron) = 0.45 J/(g × ° C)
T (final) = 79 ºC
To (initial) = 14 ºC
ΔT = T - To → ΔT = 79 - 14 → ΔT = 65 ºC

Formula:
Q = m*c*ΔT

Solving:
Q = m*c*ΔT
Q = 35*0.45*65
\boxed{\boxed{Q = 1023.75\:Joules}}\end{array}}\qquad\quad\checkmark

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diamong [38]
We can use the law of conservation of energy to solve the problem.

The total mechanical energy of the system at any moment of the motion is:
E=U+K = mgh + \frac{1}{2}mv^2
where U is the potential energy and K the kinetic energy.

At the beginning of the motion, the ball starts from the ground so its altitude is h=0 and therefore its potential energy U is zero. So, the mechanical energy is just kinetic energy:
E_i = K_i =  \frac{1}{2}mv^2 =  \frac{1}{2}(0.3 kg)(8.2 m/s)^2=10.09 J

When the ball reaches the maximum altitude of its flight, it starts to go down again, so its speed at that moment is zero: v=0. So, its kinetic energy at the top is zero. So the total mechanical energy is just potential energy:
E_f = U_f
But the mechanical energy must be conserved, Ef=Ei, so we have
U_f = K_i
and so, the potential energy at the top of the flight is
U_f = K_i = 10.09 J
7 0
3 years ago
Read 2 more answers
Thanks + BRAINLIST <br><br> Please need correct answer asappp
nirvana33 [79]

Answer:

  1. Standing waves can be thought of as a sin wave and a cos wave overlapping each other. They go in different direction hence C is correct
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6 0
2 years ago
The ray diagram shows a vase that is placed beyond the center of curvature of a concave mirror.
SIZIF [17.4K]
The image will form in the vicinity of F. Its nature will be small and inverted 
8 0
3 years ago
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Two cars collide and come to a complete stop. where did all of their energy go?
MA_775_DIABLO [31]
Most of the energy will be absorbed by the materials that make up the cars, causing them to deform. The energy will also be converted into sound energy, causing a loud bang upon collision. Also, some energy will be converted to thermal energy, which will cause the cars to heat up slightly.
3 0
3 years ago
Mathphys :( im sorry i annoy you
Vitek1552 [10]

Answer:

4. 7.59276

Explanation:

Add up the x components:

Aₓ + Bₓ + Cₓ = 5 − 1.6 + 2.4 = 5.8

Add up the y components:

Aᵧ + Bᵧ + Cᵧ = -2.4 + 3.3 + 4 = 4.9

Use Pythagorean theorem to find the magnitude:

√(x² + y²)

√(5.8² + 4.9²)

√57.65

7.59276

3 0
2 years ago
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