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3 years ago

13

When salt dissolves in water, what type of change occurs?

1 answer:

Soloha48 [4]3 years ago

6 0

Question:

When salt dissolves in water, what type of change occurs?

Answer:

A physical change results in a change of the material's appearance, but no new chemical products result. So the answer would be A.

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A constant force of 2.5 N to the right acts on a 4.5 kg mass for 0.90 s.

Alborosie

Answer:

(a) $v_f=0.5\frac{m}{s}$

(b) $v_f=-11\frac{m}{s}$

Explanation:

(a) Since a constant external force is applied to the body, it is under an uniformly accelerated motion. Using the following kinematic equation, we calculate the final velocity of the mass if it is initially at rest( $v_0=0$ ):

$v_f=v_0+at\\v_f=at(1)$

According to Newton's second law:

$F=ma\\a=\frac{F}{m}(2)$

Replacing (2) in (1):

$v_f=\frac{F}{m}t\\v_f=\frac{2.5N}{4.5kg}(0.9s)\\v_f=0.5\frac{m}{s}$

(b) In this case we have $v_0=-11.5\frac{m}{s}$ . So, we use the final velocity equation:

$v_f=v_0+at\\v_f=v_0+\frac{F}{m}t\\v_f=-11.5\frac{m}{s}+\frac{2.5N}{4.5kg}(0.9s)\\v_f=-11\frac{m}{s}$

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3 years ago

Find the vector parallel to the resultant of the vector A=i +4j-2k and B=3i-5j+k

Zinaida [17]

Answer:

2008

Explanation:

2000+3+5======2008

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343 meters per second Is the answer

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The Achilles tendon, which connects the calf muscles to the heel, is the thickest and strongest tendon in the body. In extreme a

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2) extension = 0.0215 m

Explanation:

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