Nichrome wire, often used for heating elements, has resistivity ...

[oliviahorn72]

Nichrome wire, often used for heating elements, has resistivity of 1.0  10-6   m at room temperature.
 
  What length of No. 30 wire (of diameter 0.250 mm) is needed to wind a resistor that has 50 ohms at room temperature?
  A) 22.4 m B) 0.61 m C) 6.54 m D) 3.66 m E) 2.45 m

Question 2

A 5 kg ball collides head-on with a 10 kg ball, which is initially stationary. The collision is inelastic. Which statement is true?
 
  A) The magnitude of the change of velocity the 5 kg ball experiences is greater than that of the 10 kg ball.
  B) The magnitude of the change of velocity the 5 kg ball experiences is less than that of the 10 kg ball.
  C) The magnitude of the change of velocity the 5 kg ball experiences is equal to that of the 10 kg ball.
  D) The magnitude of the change of the momentum of the 5 kg ball is equal to the magnitude of the change of momentum of the 10 kg ball.
  E) Two of the above statements are true.

[rekilledagain]

Answer to Question 1

E

Answer to Question 2

A

[oliviahorn72]

Excellent

[bblaney]

Gracias!