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3 years ago

Guys I need help with my homework please !!!!

Physics

1 answer:

Sergio [31]3 years ago

6 0

Answer:

(a) To draw water from a well we have to pull at the rope.

(b) A charged body attracts an uncharged body towards it.

(d) The north pole of a magnet repels the north pole of another magnet.

Explanation:

Just trust me

You might be interested in

Why is the nucleus of an atom dense

Inessa [10]

Explanation:

The nucleus of an atom is dense because it contains more of particles in a very little space.

The nucleus is the center of an atom made up of the protons and neutrons.

Atomic nucleus is very small compared to the size of the atom.

Density is function of mass and volume.

Mass is the amount of matter in a substance.

Volume is the space occupied by a substance.

The more the mass the more the density.

Since protons and neutron are massive bodies occupying a small space, they make the nucleus very dense.

learn more:

Density brainly.com/question/5055270

#learnwithBrainly

7 0

2 years ago

Some element can be either solid or liquid. At the melting point, the liquid has 8 × 10-22 J more enthalpy per atom than the sol

OlgaM077 [116]

Answer:

481.76 J/mol

133.33 K

Explanation:

$N_A$ = Avogadro's number = $6.022\times 10^{23}$

Change in enthalpy is given by

$\Delta H=8\times 10^{-22}\times 6.022\times 10^{23}\\\Rightarrow \Delta H=481.76\ J/mol$

Entropy is given by

$\Delta S=6\times 10^{-24}\times 6.022\times 10^{23}\\\Rightarrow \Delta S=3.6132\ J/mol K$

Latent heat of fusion is given by

$L_f=\Delta H\\\Rightarrow L_f=481.76\ J/mol$

The latent heat of fusion is 481.76 J/mol

Melting point is given by

$T_m=\dfrac{L_f}{\Delta S}\\\Rightarrow T_m=\dfrac{8\times 10^{-22}\times 6.022\times 10^{23}}{6\times 10^{-24}\times 6.022\times 10^{23}}\\\Rightarrow T_f=133.33\ K$

Melting occurs at 133.33 K

3 0

2 years ago

A horticulturist us planning a garden that is 4 m x 20 m. Which dimensions could she use to create a scale model to plan it

Radda [10]

Answer: 40 cm x 200 cm

Explanation:

5 0

3 years ago

The amount of kinetic energy and object has depends on its ?

Lady_Fox [76]

It depends on Mass and velocity

4 0

2 years ago

A liquid of density 1288 kg/m3 flows with speed 2.88m/s into a pipe of diameter 0.24 m. The diameter of the pipe decreases to 0.

Tju [1.3M]

Answer:

66.35m/s

Explanation:

Para resolver el ejercicio es necesario la aplicación de las ecuaciones de continuidad, que expresan que

$A_1V_1 =A_2 V_2$

From our given data we can lower than:

$R_i = \frac{0.24}{2} = 0.12m$

$R_f = \frac{0.05}{2} = 0.025m$

So using the continuity equation we have

$A_1V_1 =A_2 V_2$

$V_2 = \frac{A_1V_1}{A_2}$

$V_2 = \frac{(\pi(0.12^2))(2.88)}{(\pi (0.25)^2)}$

$V_2 = 66.35m/s$

Therefore the velocity at the exit end is 66.35m/s

8 0

3 years ago