A machine does 1200 J of work in 1 min. What is the power developed by the machine? (Power = Work/time) in Watts OR Joules/second

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

Decreased sensitivity to an unchanging stimulus is known as

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?