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Drupady [299]
4 years ago
13

Which of these elements has four total electrons in its outer p orbital

Physics
1 answer:
Natasha2012 [34]4 years ago
5 0
Your answer would silicon
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An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing 6.0 V for 0.65 ms. The resistance of t
Firlakuza [10]

Answer:

a) Current = 11 mA

b) Energy = 66 mJ

c) Power = 101.54 W

Explanation:

a) Voltage, V = IR

   Voltage, V = 6 V, Resistance, R = 550 Ω

   Current, I =\frac{6}{550}=0.011A=11mA

b) Energy = Current x Voltage = 6 x 0.011 = 0.066 J = 66 mJ

c) \texttt{Power=}\frac{Energy}{Time}=\frac{0.066}{0.65\times 10^{-3}}=101.54W    

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Which of the following can enter and exit an open system?
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2 years ago
The 2-kg collar is attached to a spring that has an un-stretched length of 3.0 m. If the collar is drawn to point B and releases
Bezzdna [24]

Complete Question

The image for this question is shown on the first uploaded image

Answer:

v =  3.4 \ m/s

Explanation:

From the question we are told that

   The mass of the collar is  m =  2 \ kg

    The original length is  L =  3.0 \ m

     The spring constant is  k =  3.0 \ N/m

     

Generally the extension of the spring  is  mathematically evaluated as

        e =  4 -3 =  1 \ m

Now with Pythagoras theorem we can obtain the length from A to B as

        AB  =  \sqrt{5 ^2  + 4^2}

       AB  = 6.4 \ m

The  extension of the spring at B is  

     e_b  =  6.4 -  3 =  3.4 \ m

According to the law of energy conservation

   The energy stored in the spring at point A +  the kinetic energy of the  spring =  The  energy stored on the spring at B

So

     \frac{1}{2}  *  k * e  +  \frac{1}{2}  * m* v^2  =  \frac{1}{2}  *  k * e_b

substituting values

    \frac{1}{2}  *  3 * 1^2  +  \frac{1}{2}  * 2* v^2  =  \frac{1}{2}  *  3 *  3.4^2

=>   v =  3.4 \ m/s

8 0
4 years ago
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