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3 years ago

What SI unit replaces the pound. what does this measure

1 answer:

7 0

The SI system of measurements was created to provide a standard
system that could be used and understood by scientists and ordinary
people everywhere. No such system had existed before. The SI ('metric')
system stands on its own. It doesn't explicitly 'replace' anything, unless the
users of other systems decide to throw off their ancient, complicated, and
difficult systems and climb aboard the metric bandwagon. To date, every
country in the world has done that, except the three backward shadowy
societies who prefer to resist change and wallow in their old habits.
The three holdouts are Burma, Liberia, and the USA.

In the complex and confusing "customary" system, the "pound" is used
both as a unit of mass and as a unit of force.

When "pound" means "poundmass", it can be replaced by the kilogram.
And when it means "poundforce", it can be replaced by the Newton.

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5) Quiz - NO links

Olegator [25]

False does not last that long

5 0

3 years ago

A 2 kg object being pulled across the floor with a speed of 10 m/sec is suddenly

zvonat [6]

Answer:

The frictional force producing this deceleration would have a magnitude of $4\; \rm N$ .

Explanation:

The velocity of this object changed by $\Delta v = (-10\; \rm m\cdot s^{-1})$ in $\Delta t = 5\; \rm s$ . The acceleration of this object would be:

$\begin{aligned}a &= \frac{\Delta v}{\Delta t} \\ &= \frac{-10\; \rm m\cdot s^{-1}}{5\; \rm s} = -2\; \rm m\cdot s^{-2}\end{aligned}$ .

Let $m$ denote the mass of this object. By Newton's Second Law of Motion, the net force on this object would be:

$\begin{aligned}F &= m \, a \\ &= 2\; \rm kg \times (-2\; \rm m\cdot s^{-2}) \\ &= -4\; \rm N\end{aligned}$ .

( $1\; {\rm kg \cdot m \cdot s^{-2} = 1\; {\rm N}$ .)

If the floor is level, friction would be the only unbalanced force on this object. Thus, the magnitude of the frictional force on this object would also be $4\; {\rm N}$ , same as the magnitude of the net force on this object.

5 0

3 years ago

5. A man in a car is listening to the radio. The radio station is broadcasting at a frequency of 85 MHz from two radio transmitt

nasty-shy [4]

Answer:

Speed = 0.00392 m/s

Explanation:

Solution:

Frequency of the radio = 85 MHz

If we have the frequency, we can calculate the wavelength of the radio wave.

As we know,

Frequency = speed of light/wavelength

wavelength = c/f

c = speed of light = 3 x $10^{8}$ m/s

So,

Wavelength = 3 x $10^{8}$ m/s / 85 x $10^{6}$ Hz

Wavelength = 3.5294 m

Man gets disturbed reception at t = 15 min

t = 15 x 60 = 900 s

t = 900 s

Speed = distance/time

Here, distance is wavelength. So,

Speed = 3.5294 m / 900 s

Speed = 0.00392 m/s

Hence, the man's car is going with speed of 0.00392 m/s

3 0

3 years ago

A 14 kg block lifted 5 m has a gravitational potential energy of

harina [27]

Answer:

700 joules

Explanation:

potential energy = m × h × g

( m = mass, h = height, g = acceleration due to gravity )

P.E = 14 × 5 × 10
P.E = 700 J

hence, gravitational potential energy of the object is 700J

i hope it helped.....

8 0

3 years ago

The combination of all forces that act on an object are (2 points)

qaws [65]

Answer:

A) The net force

Explanation:

If two forces of equal strength act on an object in opposite directions, the forces will cancel, resulting in a net force of zero and no movement.

5 0

4 years ago