A plane has a speed of 275 km/hr. The wind is in the opposite direction as the plane with a speed of 75 km/hr. What is the combined speed? A. 350 km/hr
B. 309 km/hr
C. 200 km/hr
D. 264 km/hr

Asap 1. which surface feature of the moon is characterized by mountainous areas? question options: maria terrae regolith craters 2.which statement describes surface features called maria on the moon? question options: layers of dust and rock deep areas of cooled lava deep, rocky and barren valleys highlands and mountainous areas

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.

Why do atoms emit energy of only specific wavelengths