If the air inside a balloon exerts a force of 1.5 n on an area of 0.5m^2 what is the pressure inside the ballon
0.5n/m2

1.5n/m2

3n/m2

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.