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Zigmanuir [339]
3 years ago
15

A resistance is added in parallel to a 470 Ω resistance to give an effective resistance of 330 Ω. What is the approximate value

of the added resistance? A) 140 Ω B) 680 Ω C) 1.1 kΩ D) 1.8 kΩ
Physics
1 answer:
saw5 [17]3 years ago
4 0
I think its c on the test I had
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Read 2 more answers
A weight lifter is trying to do a bicep curl with a weight of 300 N. At the "sticking point", the moment arm of this weight is 3
lesantik [10]

Answer:

The weight lifter would not get past this sticking point.

Explanation:

Generally torque applied on the weight is mathematically represented as

             T =  F z

To obtain Elbow torque we substitute 4000 N for F (the force ) and 2cm = \frac{2}{100} = 0.02m for z the perpendicular distance

So Elbow Torque is   T_e= 4000 * 0.02

                                   = 80Nm

 To obtain the torque required we substitute 300 N for F and 30cm =\frac{30}{100} = 0.3 m

  So the Required Torque is T_R = 300 *0.3

                                                     =90Nm

Now since   T_e < T_R it mean that the weight lifter would not get past this sticking point

                                   

7 0
3 years ago
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