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Anvisha [2.4K]
3 years ago
12

The product of 2 x 104 cm and 4 x 10–12 cm, expressed in scientific notation is ____.

Physics
1 answer:
sdas [7]3 years ago
6 0
Answer:    8 * 10⁻⁸  cm²  .
______________________________________________________
Explanation:
______________________________________________

(2 * 10⁴ cm) * (4 * 10⁻¹² cm)  =

2 *4 * 10⁴ * 10⁻¹² = 8 * 10⁽⁴⁺⁽⁻¹²⁾⁾ =  8 * 10⁻⁸  cm² .
_________________________________________

Note the follow property of exponents:
_____________________________________________________
 
xᵃ * xᵇ = x⁽ᵃ ⁺ ᵇ⁾  ;  as such:  " 10⁴ * 10⁻¹² = 10⁽⁴⁺⁽⁻¹²⁾⁾ = 10⁻⁸ " .
_____________________________________________________
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Complete Question:

A machinist turns the power on to a grinding wheel, which is at rest at time t = 0.00 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 25 rad/s. The wheel is run at that angular velocity for 37 s and then power is shut off. The wheel decelerates uniformly at 1.5 rads/s2 until the wheel stops. In this situation, the time interval of angular deceleration (slowing down) is closest to

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