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3 years ago

Select the correct answer.

Physics

2 answers:

elixir [45]3 years ago

5 0

A) Energy is absorbed in the reaction.

Such reactions are called endothermic reactions.

svetoff [14.1K]3 years ago

3 0

Answer:

<h2>A. Energy is absorbed in the reaction.</h2>

Explanation:

In chemistry, there are two types of reactions: Exothermic and Endothermic Reactions.

An exothermic reaction occurs when the reactants have higher energy than the products, the effect is energy released.

On the contrary, an endothermic reaction is when the products have higher energy than reactants, and the energy is absorbed.

So, based on these concepts, the correct answer is A, in a given chemical reaction, if the energy of the products is greater than the energy of the reactants, energy is absorbed.

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Calculate the heat energy needed to change the temperature of 2 kg of copper from 10°C to 110°C.

serious [3.7K]

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3 years ago

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The field is strongest at which point?

Licemer1 [7]

Answer:The poles

Explanation:

The field is strongest at the poles

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3 years ago

A motorcycle accelerates uniformly from rest at 7.9\,\dfrac{\text{m}}{\text{s}^2}7.9 s 2 m 7, point, 9, space, start fraction,

8090 [49]

Answer:

t = 3.516 s

Explanation:

The most useful kinematic formula would be the velocity of the motorcylce as a function of time, which is:

$v(t) = v_0 +at$

Where v_0 is the initial velocity and a is the acceleration. However the problem states that the motorcyle start at rest therefore v_0 = 0

If we want to know the time it takes to achieve that speed, we first need to convert units from km/h to m/s.

This can be done knowing that

1 km = 1000 m

1 h = 3600 s

Therefore

1 km/h = (1000/3600) m/s = 0.2777... m/s

100 km/h = 27.777... m/s

Now we are looking for the time t, for which v(t) = 27.77 m/s. That is:

27.777 m/s = 7.9 m/s^2 t

Solving for t

t = (27.7777 / 7.9) s = 3.516 s

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3 years ago

Which is classified as an inner transition element

slamgirl [31]

An inner transition metal (ITM) is one of a group of chemical elements on the periodic table. They are normally shown in two rows below all the other elements. They include elements 57-71 (lanthanides) and 89-103 (actinides).

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3 years ago

A toy cannon uses a spring to project a 5.24-g soft rubber ball. The spring is originally compressed by 5.01 cm and has a force

salantis [7]

Answer:

Speed will be equal to 1.40 m/sec

Explanation:

Mass of the rubber ball m = 5.24 kg = 0.00524 kg

Spring is compressed by 5.01 cm

So x = 5.01 cm = 0.0501 m

Spring constant k = 8.08 N/m

Frictional force f = 0.031 N