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kirza4 [7]
3 years ago
11

Es

Physics
2 answers:
VashaNatasha [74]3 years ago
6 0

Answer:) The answer is D decreasing the radius of the swing.

Explanation:

Decrease the radius of the swing Each swing moves around the perimeter in the same amount of time, but the smaller the radius of the circle the slower the speed.

pishuonlain [190]3 years ago
5 0

Answer:

D. Decrease the radius of the swing in the circle

Explanation:

Decreasing the friction on the chain and increasing the radius of the swing in the circle will both increase the speed.

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3 years ago
How much thermal energy does it take to raise the temperature of 4.5 kg of
Romashka [77]

The amount of thermal energy needed is 626.6 J

Explanation:

When a certain amount of heat energy Q is supplied to a substance, the temperature of the substance increases according to the equation

Q=mC_s \Delta T

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\Delta T is the change in temperature

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m = 4.5 kg is the mass

C_s = 1.68 kJ/kg^{\circ} is the specific heat capacity of the substance

\Delta T = 97-12=85^{\circ}C is the change in temperature of the substance

Solving for Q,

Q=(4.5)(1.68)(85)=626.6 J

(Note that the substance cannot be water, since specific heat capacity of water is 4.18 kJ/kg^{\circ}C

Learn more about specific heat  capacity:

brainly.com/question/3032746

brainly.com/question/4759369

#LearnwithBrainly

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