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3 years ago

What is the purpose of machines related to work, force, and energy?

1 answer:

4 0

A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force.

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Helicopter blades withstand tremendous stresses. In addition to supporting the weight of a helicopter, they are spun at rapid ra

BabaBlast [244]

Explanation:

It is given that,

Length of the helicopter, l = 3.1 m

The helicopter rotates, the length of helicopter will become the radius of circular path, r = 3.1 m

Angular speed of the helicopter, $\omega=280\ rev/min=29.32\ rad/s$

(a) The centripetal acceleration in terms of angular velocity is given by :

$a_c=r\times \omega^2$

$a_c=3.1\times (29.32)^2$

$a_c=2664.95\ m/s^2$

(b) Let v is the linear speed of the tip. The relation between the linear and angular speed is given by :

$v=r\times \omega$

$v=3.1\times 29.32$

v = 90.89 m/s

$\dfrac{v_{tip}}{v_{sound}}=\dfrac{90.89}{340}=0.267$

Hence, this is the required solution.

4 0

3 years ago

A circular loop of radius r is rotated through a magnetic field B, which of the following would increase the magnetic flux throu

s344n2d4d5 [400]

Answer: B

Explanation: I think

3 0

2 years ago

A 75 kV x-ray machine gives an exposure of 200 mR for a 0.2-sec chest x-ray exam.

pashok25 [27]

Explanation:

Given that,

Potential = 75 kV

Exposure = 200 mR

Time = 0.2 sec

We need to calculate the x-ray fluence during this chest x-ray exam

Using formula of fluence

$x-ray\ fluence=exposure\times time$

Put the value into the formula

$x-ray\ fluence=200\times0.2$

$x-ray\ fluence=40\ mRs$

We need to calculate the energy fluence

Using formula of energy fluence

$E_{f}=40\times10^{-3}\times75\times10^{3}$

$E_{f} = 3000\ J$

We need to calculate dose -equivalent delivered to the bone, muscle, and fat

Using formula of dose

$D=\dfrac{E}{t}$

Where, D = dose

E = energy

t = time

Put the value into the formula

$D=\dfrac{3000}{0.2}$

$D=15.0\ kJ$

Hence, This is the required solution.

7 0

3 years ago

How would you decide what numeric scale to use for each axis?

faltersainse [42]

Look at at highest number for each x and y value given

7 0

3 years ago

A microwave oven with a power rating of 1,790 watts is used for 49 minutes. How much electrical energy is used by the microwave

nasty-shy [4]

1790 = electrical energy / 2940 seconds
Electrical energy = 5262.6kJ

or

1.79kW X 49/60
= 1.46kWh

8 0

2 years ago