A copper block rests 43.4 cm from the center of a steel turntable. The coefficient of static friction between block and surface is 0.318. The turntable starts from rest and rotates with a constant angular acceleration of 0.259 rad/s 2 . The acceleration of gravity is 9.8 m/s 2 . After what interval will the block start to slip on the turntable?[ Hint: Ignore the tangential component of the acceleration.] Answer in units of s.

10.3 s

Explanation:

We are given that

r=43.4 cm=

1 m=100 cm

Coefficient of static friction=

Angular acceleration=

Initial angular velocity =

Acceleration of gravity=

Angular acceleration=

Using the formula

Force acting on block after time t=

Friction force=

Substitute the values

Hence, the block will start to slip on the turntable after 10.3 s.

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =

the journeys of marquette, joliet and la salle a) new france expand.

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