Air is made of 80% nitrogen and 20% oxygen by volume. the densities of air and oxygen is 1.29kgm^-3 and 1.43kgm^-3 respectively. what is the density of nitrogen? specify your soultion, you!

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping