The vertical and horizonatal displacement of a projectile with initial velocity 100m|s are respectively (1000-4000)m and 1000m find the angle of the projectile

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.