Calculate the energy needed to heat 4 kg of water from 25°c to 45°c.

heat =

80 kcal
100 kcal
180 kcal
280 kcal

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

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.

Which is the most accurate name for the ionic compound cas?