7. How many main parts does the space

You want the output current from the secondary coil of a transformer to be 10 times the input current to the primary coil. The r

WARRIOR [948]

Answer:

D. 0.1

Explanation:

Using transformer equation,

N2/N1 = I1/I2................... Equation 1

Where N2 = secondary coil, N1 = primary coil, I1 = input current, I2 = output current.

make I2 the subject of the equation

I2 = I1/(N2/N1)............ Equation 2

From equation 2 above, For the output current of the secondary coil to be 10 times the input current, N2/N1 = 0.1

Hence the right option is D. 0.1

7 0

4 years ago

A block of mass 12.2 kg is sliding at an initial velocity of 6.65 m/s in the positive x-direction. The surface has a coefficient

valentina_108 [34]

Explanation:

Given that,

Mass of the block, m = 12.2 kg

Initial velocity of the block, u = 6.65 m/s

The coefficient of kinetic friction, $\mu_k=0.253$

(a)The force of kinetic friction is given by :

$f=\mu_k mg$

mg is the normal force

So,

$f=0.253\times 12.2\times 9.8\\\\f=30.24\ N$

(b) Net force acting on the block in the horizontal direction,

f = ma

a is the acceleration of the block

$a=\dfrac{f}{m}\\\\a=\dfrac{30.24}{12.2}\\\\a=2.47\ m/s^2$

(c) Let d is the distance covered by the block before coming to the rest. Using third equation of motion as follows :

$v^2-u^2=2ad\\\\d=\dfrac{v^2-u^2}{2a}\\\\d=\dfrac{-(6.65)^2}{2\times 2.47}\\\\d=-8.95\ m$

Hence, this is the required solution.

3 0

3 years ago

A uniform, thin rod of length h and mass M is held vertically with its lower end resting on a frictionless horizontal surface. T

saveliy_v [14]

Answer:

$v = \sqrt{gh}$

Explanation:

Since there's no external force beside gravity acting on the rod, we can use the law of energy conservation to calculate for the speed of rod center of gravity before hitting the surface.

Also as the rod is uniform and this, its center of gravity is at distance h/2 from the surface.

$E_k = E_p$

$mv^2/2 = mgh/2$

$v^2 = gh$

$v = \sqrt{gh}$

5 0

3 years ago

A girl pushes a cart to the left with 100-N force a boy pushes it to the right with a 50-N force. The net force extended on the

Allisa [31]

50 N to the left
youre welcome :)

5 0

3 years ago

Enzymes speed up a biological reaction by

lord [1]

B) lowering the activation energy !
__________
hope it helps!

6 0

3 years ago