Acar is travelling at a constant speed of 30m s -1 on
the road when a kangaroo crosses in front of the car at a distance of 65 m away. the driver takes 0.6 seconds to hit the brakes and then she decelerates with a constant deceleration 10.0 m s -2
calculate how fast the car is travelling in m s.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.

What are the dimensions of the cross section that passes through the points a, f, g, and d?