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4 years ago

Battery life is what distinguishes one type of mobile computer from another.

1 answer:

8 0

I think the statement is false. It is not only the battery life that would distinguish one type of mobile computer from another. There are other aspects that would characterize every mobile computer. It could be the brand, the size, the operating system, the hardware specifications like the RAM, processor and the video card. Every mobile computer would vary depending on the brand, model and intended use.

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Explain why it is important to identify a reference point for any description of motion.

Leya [2.2K]

A reference is critical because it determines how much motion has occurred. You can't determine how much an objected has moved if you don't know where it came from.

3 0

3 years ago

Read 2 more answers

A 20Kg box is pushed across the floor at a constant velocity with a force of 200N. What is the

Shkiper50 [21]

Answer:

The kinetic coefficient of friction between the box and the floor is 1.020.

Explanation:

Let suppose that box is on horizontal ground. According to the Newton's Laws, an object has a net acceleration of zero when either is at rest or moves at constant velocity. Friction is a reaction to the external force that moves the box. Hence, the equation of equilibrium for the 20-Kg box is:

$\Sigma F = F-f = 0$ (Eq. 1)

Where:

$F$ - External force, measured in newtons.

$f$ - Friction force, measured in newtons.

If we know that $F = 200\,N$ , then the magnitude of the kinetic friction force is:

$f = F$

$f = 200\,N$

In addition, friction force is represented by the following formula:

$f = \mu_{k}\cdot m\cdot g$ (Eq. 2)

Where:

$\mu_{k}$ - Kinetic coefficient of friction, dimensionless.

$m$ - Mass, measured in kilograms.

$g$ - Gravitational acceleration, measured in meters per square second.

Now we clear the kinetic coefficient of friction:

$\mu_{k} = \frac{f}{m\cdot g}$

If we know that $f = 200\,N$ , $m = 20\,kg$ and $g = 9.807\,\frac{m}{s^{2}}$ , then the kinetic coefficient of friction is:

$\mu_{k} = \frac{200\,N}{(20\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)}$

$\mu_{k} = 1.020$

The kinetic coefficient of friction between the box and the floor is 1.020.

4 0

3 years ago

Atom A consists of 10 protons, 12 neutrons, and 10 electrons.

koban [17]

Answer: They are not isotopes of each other.

Explanation: An isotope is when they have the same number of protons but different number of neutrons. Atom A and Atom B have different amount of protons.

6 0

3 years ago

What is the reaction force of a hammer hitting a nail?

VLD [36.1K]

Newton's 3rd law says that for every force there is an equal and opposite reaction force.
So for the force of the hammer hitting the nail, there is a force equal in magnitude exerted back on the hammer by the nail (and is "opposite" because it's in the other direction and on the hammer.)

6 0

3 years ago

An electron with energy 13.2 eV collides with an element, and the electron emerges with energy 4.5 eV. What wavelength of light

Alecsey [184]

Answer: $140\ nm$

Explanation:

Given

Initial kinetic energy is $K_i=13.2\ eV$

Final kinetic energy is $K_f=4.5\ eV$

Change in kinetic energy is $\Delta K=K_i-K_f$

$\Rightarrow \Delta K=13.2-4.5\\\Rightarrow \Delta K=8.7\ eV$

Energy is given by

$E=\dfrac{hc}{\lambda}$

Equate it to change in kinetic energy

$\Rightarrow 8.7=\dfrac{hc}{\lambda}\\\\\Rightarrow \lambda =\dfrac{6.63\times 10^{-34}\times 3\times 10^8}{8.7\times 1.6\times 10^{-19}}\\\\\Rightarrow \lambda =1.4\times 10^{-7}\ m\\\Rightarrow \lambda=140\ nm$

Therefore, the wavelength associated with it is $140\ nm$ .

3 0

3 years ago