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Angelina_Jolie [31]
3 years ago
13

A solar panel is used to collect energy from the sun and change it into other forms of energy. The picture below shows some sola

r panels on the roof of a building. Which form of energy to collected by the solar panels?
A. Wind

B. sound

C. Magnetic

D. Light
Physics
1 answer:
irakobra [83]3 years ago
4 0
C I’m pretty sure!!!!!
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A pendulum is constructed from a 6 kg mass attached to a strong cord of length 1.7 m also attached to a ceiling. Originally hang
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Answer:

work done is -2.8  × 10⁻⁶ J

Explanation:

Given the data in the question;

mass of the pendulum m = 6 kg

Length of core = 1.7 m

Now, case1, mass is pulled aside a small distance of 7.6 cm and released from rest. so let θ₁ be the angle made by mass with vertical axis.

so, θ₁ = ( 7.6 × 10⁻² m / 1.7 m ) = 0.045 rad

In case2, mass is pulled aside a small distance of 8 cm and released from rest. so let θ₁ be the angle made by mass with vertical axis.

so, θ₂ = ( 8 × 10⁻² m / 1.7 m ) = 0.047 rad.

Now, the required work done will be;

W = \int\limits^{\theta_2} _{\theta_1} {r} \, d\theta

W = \int\limits^{\theta_2} _{\theta_1} {-mgl sin\theta } \, d\theta

W = -mgl  \int\limits^{0.047 } _{0.045 } {sin\theta } \, d\theta

W = -mgl[ -cosθ ]^{0.047}_{0.045 }

W = 6 × 9.8 × 1.7 × [ cos( 0.047 ) - cos( 0.045 ) ]

W = 6 × 9.8 × 1.7 × [ -2.8 × 10⁻⁸ ]

W = -2.8  × 10⁻⁶ J

Therefore, work done is -2.8  × 10⁻⁶ J

6 0
3 years ago
If the change in enthalpy is -5074.1 kj , how much work is done during the combustion?
baherus [9]
Hence, 
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<span>=> </span>
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<span>= -5074 kJ - (-5084.) kJ </span>
<span>= 10 kJ</span>
8 0
3 years ago
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