1.A beaker of mass 1.5 kg containing 2.4 kg of water rests on a scale. A 2.4 kg block of a
metallic alloy of density 4800 kg/m3
is suspended from a spring scale and is submerged
in the water of density 1000 kg/m3. What does the hanging scale read? The
acceleration of gravity is 9.8 m/s^2.
Answer in units of N.

2.What does the lower scale read?
Answer in units of N.

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.

On your wedding day your lover gives you a gold ring of mass 3.67 g. 48 years later its mass is 3.44 g. on the average how many atoms were abrated from the ring during each second of your marriage? the atomic mass of gold is 197 u. don't enter units

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false