What type of simple machine is an electric fan?

Physics

1 answer:

GrogVix [38]2 years ago

5 0

Answer:

An electric fan is considered to be a mixture of several simple machines. It includes the Wheel and Axle type, wedges, and the Inclined plane types. The blades of an electric fan are the inclined planes and the wedges.

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A merry-go-round starts from rest and reaches the angular speed of 4 rpm in the first two minutes. what would be the angular acc

Anarel [89]

initially marry go round is at rest

after t= 2 minutes its final angular speed is 4 rpm

$w_f = 2 \pi *\frac{4}{60}$

$w_f = 0.42 rad/s$

now by using kinematics we will have

$w_f = w_0 + \alpha * t$

$0.42 = 0 + \alpha * (2*60)$

$\alpha = 3.5 * 10^{-3} rad/s^2$

$\alpha = 3.5 * 10^{-3} * \frac{60*60}{2\pi}$

$\alpha = 2 rev/min^2$

7 0

3 years ago

The uncertainty in the position of an electron along an x axis is given as 68 pm. What is the least uncertainty in any simultane

umka21 [38]

Answer:

$\Delta p_x=7.75\times 10^{-25}\ kg-m/s$

Explanation:

Given that,

The uncertainty in the position of an electron along the x-axis is, $\Delta x=68\ pm=68\times 10^{-12}\ m$

We need to find the east uncertainty in any simultaneous measurement of the momentum component of this electron.

We know that the Heisenberg's uncertainty principle gives the relation between the uncertainty in position and the momentum of electron as :

$\Delta p_x{\cdot}\Delta x\ge \dfrac{h}{4\pi }$

Putting all the values, we get :

$\Delta p_x{\cdot}\ge \dfrac{h}{4\pi \Delta x}\\\\\Delta p_x \ge \dfrac{6.63\times 10^{-34}}{4\pi \times 68\times 10^{-12}}\\\\\Delta p_x\ge 7.75\times 10^{-25}\ kg-m/s$