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Kitty [74]
3 years ago
13

What volume In liters is a cube 20cm on a side? If the cube is filled with water what is the mass of the water?

Physics
1 answer:
frez [133]3 years ago
7 0
1 liter = 1000 cm^3
20cm * 20cm * 20cm = 8000 cm^3
8000/1000 = 8 liters

Since 1ml of water = 1 cm^3 = 1 grams
8 liters = 8000 grams = 8 kilograms
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True or false?
Ksju [112]

1. False

Explanation: it's exactly the opposite. In fact, Lenz's law states that the induced current and the induced emf in a conductor are generated in such a direction that opposes to the change in magnetic flux through the coil. This is summarized by the negative sign in the Faraday's Newmann Lenz law:

\epsilon= -\frac{d\Phi }{dt}

where \epsilon is the emf induced and \frac{d\Phi}{dt} is the rate of change of magnetic flux through the coil.

Lenz's law is a consequence of the law of conservation of energy. In fact, we have:

- If the magnetic flux through a coil is increasing, then the induced current has a direction such that the magnetic field generated by the coil is opposite to the direction of the external magnetic field, in order to decrease the total flux

- If the magnetic flux through a coil is decreasing, then the induced current has a direction such that the magnetic field generated by the coil is in the same direction as the external field, in order to increase the total flux

2. False

Explanation: the magnetic flux through a surface is given by

\Phi = BA cos \theta

where

B is the magnitude of the magnetic field

A is the surface area

\theta is the angle between the direction of B and the normal vector to the surface

As we see, the magnetic flux depends not only on B and A, but also on the orientation of the coil with respect to the magnetic field.

3. False

Explanation:

- Sound waves are mechanical waves: mechanical waves are waves consisting of oscillations of the particles in a medium. Due to their nature, therefore, mechanical waves can propagate only in the presence of a medium

- Electromagnetic waves are NOT mechanical waves: they consist of oscillations of electric and magnetic fields, in a direction perpendicular to the direction of propagation of the wave. Since em waves are not mechanical waves, they do NOT need a medium to propagate, since they can also travel through a vacuum; therefore the original statement is false.

5 0
2 years ago
A 6 kg bowling ball is accelerated at a rate of 2.3 m/s² down the lane. How much force was necessary to produce this acceleratio
ira [324]
According to Newton's 2nd law of motion:
F = m * a where F is the force applied in Newtons, m is the mass of the object in kg, and a is the acceleration of the object in m/s^{2}.
Therefore the force applied in this situation is simply:
F = 6 kg * 2.3 m/s^{2} = 13.8 N
Hope this helps!
6 0
3 years ago
Which of the following processes can produce either rain or snow
umka21 [38]

Bergeron–Findeisen Process.

3 0
3 years ago
Read 2 more answers
We reduce friction in machines? why<br>​
kvv77 [185]

Answer:

friction reduces the efficiency of machines, thus we must reduce the friction force that is acting upon it.

5 0
3 years ago
Read 2 more answers
A 62 kg boy and a 37 kg girl use an elastic rope while engaged in a tug-of-war on a friction-less icy surface. If the accelerati
Paraphin [41]

Answer:

The magnitude of the acceleration of the boy toward the girl is 1.31\ m/s^2

Explanation:

It is given that,

Mass of the boy, m_1=62\ kg

Mass of the girl, m_2=37\ kg

The acceleration of the girl toward the boy is, a_2=2.2\ m/s^2

To find,

The acceleration of the boy toward the girl.

Solution,

Let a_1 is the magnitude of the acceleration of the boy toward the girl. We know that force acting on one object to other are equal in magnitude but opposite in direction. So,

F_1=-F_2

m_1a_1=-m_2a_2

a_1=-\dfrac{m_2a_2}{m_1}

a_1=-\dfrac{37\times 2.2}{62}

a_1=-1.31\ m/s^2

|a_1|=1.31\ m/s^2

So, the magnitude of the acceleration of the boy toward the girl is 1.31\ m/s^2

7 0
3 years ago
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