Auniform rectangular segment of copper wire with length and cross-sectional area has resistance: r. then this resistor is melted down, and 1/5 the material is used to make a new uniform rectangular resistor with resistance r. what is the length of thisnew resistor?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates