Amodel rocket is fired vertically from rest. it has a constant acceleration of 16.4 m/s2 for the first 1.50 s. then its fuel is exhausted, and it is in free fall. the rocket has a mass of 78.2 g; the mass of the fuel is much less than 78.2 g. ignore air resistance. what was the downward net force on the rocket after its fuel was spent?

Which statement correctly describes the relationship between frequency and wavelength?

The frequency of vibrations of a vibrating violin string is given by f = 1 2l t ρ where l is the length of the string, t is its tension, and ρ is its linear density.† (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and ρ are constant) (ii) the tension (when l and ρ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ⇒ f is ⇒ (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ⇒ f is ⇒ (iii) when the linear density is increased by switching to another string df dρ 0 and ρ is ⇒ f is ⇒

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2