3 years ago

Question 7 of 10

Physics

2 answers:

astra-53 [7]3 years ago

8 0

Answer D is an example of melting

gayaneshka [121]3 years ago

3 0

D since the ice cube, which is a solid, melts and forms a puddle on the counter, now a liquid. This process is called melting.

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During combustion reactions, explain why the energy of the reactants must exceed the total energy of the products

maxonik [38]

Answer:

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Explanation:

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3 years ago

A student pulls a block over a rough surface with a constant force FP that is at an angle θ above the horizontal, as shown above

gizmo_the_mogwai [7]

Answer:

B.The force of friction between the block and surface will decrease.

Explanation:

The force of friction is given by

$F_s = \mu N$

where $\mu$ is the coefficient of friction and $N$ is the normal force.

When the student pulls on the block with force $F_p$ at an angle $\theta$ , the normal force on the block becomes

$N = Mg- F_psin(\theta)$

and hence the frictional force becomes

$F_s = \mu (Mg- F_psin(\theta))$ .

Now, as we increase $\theta$ , $sin(\theta)$ increases which as a result decreases the normal force $Mg- F_psin(\theta)$ , which also means the frictional force decreases; Hence choice B stands true.