Lightsail-2 is a spacecraft launched in june 2019 by the planetary society driven by radiation pressure on a solar sail of area 30 square meters. it is currently in low earth orbit. given the solar constant (solar power at the earth’s surface) 1,388 w/m2 , estimate the force on the sail if it is oriented so that the solar radiation strikes the sail perpendicularly. assume the sun emits pure yellow light of wavelength 570 nm, and that each photon is specularly reflected, with no absorption. (a) (5 pts) how many yellow photons hit the sail per second? (b) (5 pts) what is the force imparted to the sail?

If vx = 7.00 units and vy = -7.60 units, determine the magnitude of v⃗ . determine the direction of v⃗ .

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 ⇒

Hen a gfci receptacle device is installed on a 20-ampere branch circuit (12 awg copper), what is the minimum volume allowance (in cubic inches) required for conductor fill for each conductor in the outlet box?