A 2-kW resistance heater in a water heater runs for 3 hours to raise the water temperature to the desired level. Determine the amount of electric energy used in both kWh and kJ.

A hydrogen atom is about 0.1 nm in diameter. How many hydrong atoms lined up side by side would make a line 1 cm long?

Which of the following is an accurate conversion of liquid to solid volume? one liter equals one cubic meter 1000 milliliters equal one cubic meter 1000 liters equal one cubic meter one liter equals 1000 cubic meter

The U. S. has an alternating current frequency of 60 Hz. China has an alternating current frequency of 50 Hz. This means that the number of times voltage cycles in a minute in the U. S. is greater than the number of times voltage cycles in China.

A light ray travels inside a horizontal plate of glass, striking its upper surface at an angle of incidence of 50°. This ray is totally internally reflected at the glass-air boundary. A liquid is then poured on top of the glass.

Given: u = 340 m / s, Wave frequency - 300 Hz, Find: λ (wavelength) - ?, T (oscillation period) - ?,

An element's atomic number is 38. How many protons would an atom of this element have?

What's are some forms of chemical energy

True or false a liquid does not have a definite shape, but it does have a definite volume.

HOw are ferns and trees alike and different and what would survive longer without rain fern or tree

1. Using Pj = e^-BE/Z in the Gibb's form for the entropy, show that F = kb Tln (Z), where F = U - TS is the Helmholtz free energy. Here Z= e^-BE is the canonical partition function ...