758
Physics Misc Topic Level: Misc Level
Solids
A stinless steel orthodontic wire is applied to a tooth that is out of line by 21 degree . The wire has an unstretched length of 4.5 cm and a diameter of 0.21 mm . If the wire is stretched 0.1 mm . find the magnitude of the force on the tooth . (Disregard to the width of the tooth). Young’s modulus for stainless steel is 1.8 x 10^11 Pa . Answer in units of N .
601
Physics Misc Topic Level: Misc Level
A bullet of mass (m) and initial speed (v) strikes , and is embedded in , the end of a uniform rod of mass (2m) and length (L) originally at rest. The rod pivots about a fixed axis at its center .(a) What is the angular momentum of the bullet/rod system with respect to the axis through the rod’s pivot ?
(b) What is the angular speed of the rod after the collision ?
(c) How much kinetic energy is lost in the collision ?
515
Physics Misc Topic Level: Misc Level
When a 24.0 ohm resistor is connected across a 12.0 V battery , a currenof 482 mA flows . What is the resulting terminal voltage of the battery ?a. 0.4 V
b. 5.8 V
c. 11.6 V
d. 12.0 V
448
Physics Misc Topic Level: Misc Level
What are the total positive and total negative charge in a nickel that is electrically neutral ? The mass of a nickel atom is 9.74 x 10^-25 kg .
