A student is carried out an experiment to find the specific heat capacity of an aluminum block. Heat is supplied by an electric heater and a thermometer is used to measure the temperatures.
Thw student record the following data.
Mass of the block = 2.0 kg
Power of heating element = 420 W
Time of heating = 95 s
Initial temperature = 19.5 degree celcius
Final temperature = 19.5 degree celcius
Using the data, calculate the specific heat capacity of the Aluminum block. (You must write the
formula/formulae used in your calculation)

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

An object in mechanical equilibrium is an object

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?