7. Rosita started riding her bike 3 km to her friend Gena's place at exactly the same time Gena started skating to Rosita's house. Gena, of course, wasn't home, so Rosita rode
back home. The two girls arrived at Rosita's house at the same time. It took Rosita
30 minutes to ride to Gena's and back. How fast did Gena skate?

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?

Discuss the difference between thermal energy and heat. (terrance) terrance, egolf, r., congdon, donald. physical science student text, 5th edition. bju press, 2014. vitalbook file.