Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands is 1.31 cm in diameter and carries a current of 39 A. If the bird’s feet are 8.12 cm apart, what is the potential difference across its body? Copper’s resistivity is 1.68 × 10−8 Ω m . Answer in units of µV.

Your 249 ml cup of coffee is too hot to drink when served at 82 degree celsius. what is the mass of an ice cube taken from a -21 degree celsius freezer, that will cool your coffee to a pleasant 54 degree celsius. specific heat of the water is 4190 j/kg c, specific heat of ice is 2090 j/kg c, heat of fusion of ice is 3.33 x 10^5 j/kg

Which of the following statement is false

When solid surfaces slide over each other the kind of friction that occurs is called friction