Please help One way that a gas can be identified is by determining the speed of sound through it. In Earth's atmosphere at sea level and at room temperature, a sound wave of frequency 440 Hz has a wavelength of 0.782
meters. What is the speed of sound through this air? *
172 m/s
281 m/s
344 m/s
563 m/s

Alightning strike consists of charge moving from a cloud to the ground . in one particular case, the electrons in a lightning strike are confined to travel within a radius of 1.5 m and to move at a speed of 5.0 x 10 m/s. if the density of electrons in the strike is 10'15 electrons/m what current is carried by the lightning ?

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping. the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?