A sample of 2.50 kg of water is held at a temperature of 100°C. How much energy must be added to completely turn the liquid water to water vapor?
(The latent heat of vaporization for water is 2260 kJ/kg; the latent heat of
fusion for water is 333 kJ/kg.)
A. 833 kJ
B. 5650 kJ
C. 133 kJ
D. 904 kJ

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same