3 years ago

28. A reaction in which the products contain more chemical energy than the reactants is (4.7)

Physics

1 answer:

Serjik [45]3 years ago

7 0

The answer is B !!!!!!!!! It’s B electrical

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What force does a trampoline have to apply to a 45.0-kg gymnast to accelerate her straight up at 7.50 m/s^2? (a) 104N (b) 338 N

Brilliant_brown [7]

Answer:

b) 338 N

Explanation: let m be the mass of the gymnast and a be the acceleration of the gymnast.

the force required to accelerate the gymnast is given by:

F = m×a

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Therefore, the force a trampoline has to apply is 138 N.

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The mass number 204 – 82 protons = 122 neutrons

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Two rocks of different masses are rolling down a hill at the same speed. Which rock (small one or big one) would have more kinet

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Kinetic energy of bigger rock will be more than that of smaller one.

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As velocity of both the rocks are same. Thus, kinetic energy is directly proportional to the mass of the rock

Kinetic energy ∝ mass

So, For greater mass kinetic energy will be greater and for smaller mass kinetic energy will be smaller.

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Convection? I'm pretty sure that's it

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