1. A train increases its speed steadily from 10m/s to 20m/s in 1 minute. a) What is its average speed during this time, in m/s?
b) How far does it travel while increasing its speed?

Who was the first scientist to measure speed as distance over time?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.