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4 years ago

The metallic elements which all react in water are found in the:

Physics

2 answers:

azamat4 years ago

7 0

Just so you know, you have the coolest question link in Brainly!--^

MAXImum [283]4 years ago

6 0

The metallic elements which all react to water are found in the same group, the groups name is the Alkali metals, or also known as group one.

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Suppose you first walk 12.5 m in a direction 20° west of north and then 24 m in a direction 40° south of west as shown in the fi

Firlakuza [10]

La ce materie vr ca sunt pe tableta

3 0

3 years ago

An electromagnet requires 3 things. Select the 3 components below.

notsponge [240]

Answer:

A. Battery

B. Iron Core

C. Solenoid

6 0

4 years ago

A man pushed a cabinet with a force of 200N. What is the mass of the cabinet that accelerates 4 m/s/s?

ELEN [110]

Answer:

$\boxed {\boxed {\sf 50 \ kg}}$

Explanation:

We are asked to find the mass of a cabinet, given the force and acceleration. According to Newton's Second Law of Motion, force is the product of mass and acceleration. The formula for this is:

$F= m \times a$

The force is 200 Newtons, but we should convert the units to make unit cancellation easier. 1 Newton is equal to 1 kilogram meter per second squared, so the force of 200 Newtons is 200 kilogram meters per second squared.

The mass is unknown and the acceleration is 4 meters per second per second or 4 meters per second squared.

F= 200 kg*m/s²
a= 4 m/s²

Substitute the values into the formula.

$200 \ kg *m/s^2 = m \times 4 \ m/s^2$

We are solving for the mass, m, so we must isolate the variable. It is being multiplied by 4 meters per second squared. The inverse operation of multiplication is division. Divide both sides by 4 m/s²

$\frac {200 \ kg *m/s^2}{4 \ m/s^2}= \frac{m \times 4\ m/s^2}{4 \ m/s^2}$

$\frac {200 \ kg *m/s^2}{4 \ m/s^2} =m$

The units of meters per second squared cancel.

$\frac {200 \ kg }{4 }=m$

$50 \ kg =m$

The mass of the cabinet is <u>50 kilograms.</u>

5 0

3 years ago

In a nuclear power plant, nuclear energy is first changed to ____ energy. (1 point)

Finger [1]

I believe the correct answer from the choices listed above is the second option. In a nuclear power plant, nuclear energy is first changed to thermal energy. Heat energy is first given off in this process. Hope this answers the question. Have a nice day.

4 0

3 years ago

Suppose that the dipole moment associated with an iron atom of an iron bar is 2.9 × 10-23 J/T. Assume that all the atoms in the

allsm [11]

Answer:

16.042336 Am²

27.2719712 Nm

Explanation:

Dipole moment association with iron atom

$\frac{\mu}{N}=2.9\times 10^{-23}\ J/T$

L = Length of bar = 6.5 cm

A = Area of bar = 1 cm²

$N_A$ = Avogadro constant = $6.022\times 10^{23}$

$\rho$ = Density of iron = 7.9 g/cm³

M = Molar mass = 55.9 g/mol

B = Magnetic field = 1.7 T

Number of atoms is given by

$N=\frac{\rho LA}{M}\times N_A\\\Rightarrow N=\frac{7.9\times 6.5\times 1}{55.9}\times 6.022\times 10^{23}\\\Rightarrow N=5.53184\times 10^{23}\ atoms$

Dipole moment is given by

$\frac{\mu}{N}\times n\\ =2.9\times 10^{-23}\times 5.53184\times 10^{23}\\ =16.042336\ Am^2$

The dipole moment of the bar is 16.042336 Am²

Torque is given by

$\tau=\mu Bsin\theta\\\Rightarrow \tau=16.042336\times 1.7sin 90\\\Rightarrow \tau=27.2719712\ Nm$

The torque exerted to hold this magnet perpendicular to an external field is 27.2719712 Nm

8 0

3 years ago