The temperature coefficient of resistivity of iron is 5 × 10-3 /°C; that of carbon is -0.5 × 10-3 /°C. When an iron wire and a carbon rod, each having the same 10 Ω resistance at 20 °C, are cooled from that temperature to -80 °C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is:

What is the mass of the same rock on the earth

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Aprojectile is launched from ground level with an initial velocity of v 0 feet per second. neglecting air resistance, its height in feet t seconds after launch is given by s equals negative 16 t squared plus v 0 t. find the time(s) that the projectile will (a) reach a height of 192 ft and (b) return to the ground when v 0equals112 feet per second. (a) find the time(s) that the projectile will reach a height of 192 ft when v 0equals112 feet per second. select the correct choice below and, if necessary, fill in the answer box to complete your choice.