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3 years ago

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

Physics

2 answers:

Vlad1618 [11]3 years ago

8 0

Answer:

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

Gekata [30.6K]3 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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Given the position vector of the particle

Natali [406]

With position vector

$\vec r(t)=(t+1)\,\vec\imath+(t^2-1)\,\vec\jmath+2t\,vec k$

the particle then has velocity

$\vec v(t)=\dfrac{\mathrm d\vec r(t)}{\mathrm dt}=\vec\imath+2t\,\vec\jmath+2\,vec k$

and acceleration

$\vec a(t)=\dfrac{\mathrm d\vec v(t)}{\mathrm dt}=\dfrac{\mathrm d^2\vec r(t)}{\mathrm dt^2}=2\,\vec\jmath$

Then $t=1$ , then particle's velocity and acceleration are, respectively,

$\vec v=\vec\imath+2\vec\jmath+2\,\vec k$

and

$\vec a=2\,\vec\jmath$

6 0

3 years ago

An object is placed at a known distance in front of a mirror whose focal length is also known. You apply the mirror equation and

Licemer1 [7]

Answer:

the image is behind the mirror, so the image is virtual and upright.

Explanation:

6 0

4 years ago

How does the number of neutrinos passing through your body at night compare with the number passing through your body during the

lapo4ka [179]

Answer:

c)While the amount of neutrinos passing through the Earth does not change much, there is something that changes to you at night. You stop moving and sleep for several hours.

Think of Neutrinos like rain. During the day you can avoid rain, and run from one dry spot to another(like from a car to a house). At night, however, your asleep, so the rain will hit you for eight hours(if your sleeping outside with no tent for some reason).

5 0

3 years ago

If velocity is positive, which woul

shusha [124]

Answer:

C. An inital volocity that is faster than the final volocity

Explanation:

5 0

3 years ago

S A block of mass M is connected to a spring of mass m and oscillates in simple harmonic motion on a frictionless, horizontal tr

cestrela7 [59]

The kinetic energy of this block-spring when the block has a speed (v) is given by K.E = 1/2 × (M + m/3)v².

<h3>What is kinetic energy?</h3>

Kinetic energy can be defined as a form of energy that is possessed by a person due to its motion or change in speed (acceleration).

<h3>How to calculate kinetic energy?</h3>

Mathematically, kinetic energy can be calculated by using this formula:

K.E = 1/2 × mv²

Where:

K.E represents the kinetic energy.

m represents the mass.

v represents the speed or velocity.

Since the mass of a segment of this spring is dm = (m/l) dx, the kinetic energy for each of its segment would be given by:

dK = 1/2 × (dm)Vx²

This ultimately implies that, the kinetic energy of this block-spring when the block has a speed (v) is given by:

K.E = 1/2 × Mv² + 1/2 × ¹∫₀((x²v²/l²)m/ldx

K.E = 1/2 × (M + m/3)v².

Read more on kinetic energy here: brainly.com/question/15848455

#SPJ4

6 0

2 years ago