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levacccp [35]
2 years ago
13

Water being turned into ice cubes in a freezer is an example of _____.

Physics
2 answers:
Vlad1618 [11]2 years ago
8 0

Answer:

an exothermic process and the change in enthalpy, ΔH, will be a negative number

Gekata [30.6K]2 years ago
7 0

Answer:

a physical change

Explanation:

after the water turns to ice, it will melt and became water again making which means it's reversible this being. a physical change

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A 9 V battery produces a current of 18 amps. What is the resistance?
artcher [175]

<h2>\bf{ \underline{Given:- }}</h2>

\sf• \: Battery  \: Voltage \:  (V) = 9 \: v

\sf•  \: Current  \: (I) = 18  \: Amps.

\\

<h2>\bf{ \underline{To \:  Find :- }}</h2>

\sf• \: The  \: Resistance.

\\

\huge\bf{ \underline{Solution :- }}

\bf \red{ \bigstar{ \: Formula  \: of  \: Resistance \:  (R) =  \frac{V}{I}}}

\rightarrow  \sf R = \frac{9}{18}

\rightarrow  \sf R = \frac{1}{2}

\rightarrow  \sf R = 0.5

\\

<h3>\bf \purple{Therefore,  \:  the \:  \:  resistance   \: \: is \:   \: 0.5   \: Ω \: .}</h3>
8 0
3 years ago
A 30 kg child is in an elevator accelerating down at a rate of -5 m/s2.
Annette [7]

Answer:

The force is - 150 N

Explanation:

F = 30 • - 5 = - 150

6 0
3 years ago
Darryl throws a basketball at the gym floor. The ball bounces once on the floor and comes to rest in his coach’s hands. At which
mina [271]

Answer:

when the ball is at rest in his coach's hands.

Explanation:

The forces on the basketball are balanced when the basketball is not experiencing any acceleration. This happens when the ball is in his coach's hand: in fact, at that moment the ball is at rest, so it means that its acceleration is zero. According to Newton's second law, this also mean that the net force on the basketball is zero, so the forces on the ball are balanced:

F=ma

where F is the net force, m is the mass of the ball and a is the acceleration.

8 0
4 years ago
Circumference of a circle given the radius or diameter? explain why or why not
djyliett [7]

Circumference of a circle can be calculated if the radius or the diameter is given.

<u>Explanation</u>:

  • Circumference or the perimeter of a circle can be calculated if the radius or the diameter of the circle is given.
  • This is calculated by the formula -  2 * pi * r (if radius is given) and  pi * d (if diameter is given) where pi = 3.14, r = radius and d = diameter
  • This calculation is based on the fact that the circumference is three and a little more times that of the radius. Since the diameter is double that of the radius, when the diameter is given formula becomes pi*d.
3 0
3 years ago
What is the speed of a bird of mass 8kg which has kinetic energy of 8836J?
Kay [80]

Answer:

For the bird moving in a straight line, the kinetic energy is one-half the product of the mass and the square of the speed: Ek=12mu2.

4 0
3 years ago
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