What do you mean by the SI units?Mention it's advantages

1 answer:

6 0

The greatest advantage of SI is that it has only one unit for each quantity (type of measurement). This means that it is never necessary to convert from one unit to another (within the system) and there are no conversion factors for students to memorize. For example, the one and only SI unit of length is the metre (m).

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Give reasons: A freely suspended magnet shows N-S poles at rest.

aniked [119]

Answer:

A freely suspended magnet comes to rest along the N-S direction.

Explanation:

-Irrespective of direction of suspension, the bar eventually comes to rest at earth's N-S direction.

-Bar end that points to Earth's north is called the North Pole. Bar end that point's to earth's south is called the South pole.

-The reason for this default positioning is called the Directive Property. This is because earth acts as an external magnetic field.

7 0

4 years ago

10-kg box is sliding across an ice rink at 10 m/s . A skater exerts a constant force of 10 N against it. How long will it take f

Taya2010 [7]

Answer:

Time, t = 10 seconds

Explanation:

Given the following data;

Mass = 10kg

Force = 10N

Final velocity = 10m/s

Initial velocity = 0m/s

To find the time;

First of all, we would find the acceleration of the box.

Force = mass * acceleration

10 = 10 * acceleration

Acceleration = 10/10 = 1m/s²

Now, we can find the time by using the first equation of motion;

V = U + at

10 = 0 + 1t

10 = t

Time, t = 10 seconds

Therefore, it will take 10 seconds for the box to come to a complete stop.

7 0

3 years ago

A car is driving northwest at v mph across a sloping plain whose height, in feet above sea level, at a point n miles north and e

coldgirl [10]

Refer to the diagram shown.

Given:
$h(n,e) = 1500 + 75n + 50e$

Define
$\hat{r} = unit \, vector \, along \, \vec{v} \\ \hat{i} = unit \, vector \, east \\ \hat{j} = unit \, vector \, north \\ \nabla \equiv \hat{i} \frac{\partial}{\partial e} + \hat{j} \frac{\partial}{\partial n}$

$\hat{r} = \frac{1}{ \sqrt{2} } (-\hat{i}+\hat{j} )$

Then the rate of change of h with respect to the vector v is
$\nabla h . \hat{r} = \frac{1}{\sqrt{2}}(50\hat{i} + 75\hat{j}).(-\hat{i}+\hat{j}) = \frac{1}{\sqrt{2}} (-50+75) =17.68$

Answer: 17.7 ft per mile