Lorentz transformation (cf. probs. 1.6.19+21 in textbook) an observer standing on earth observes spaceship travel (a) two spaceships are heading in the same direction toward earth, one at vi-0.95c and the other one at v2-0.85c relative to earth. what is the speed of spaceship- 1 as seen from the captain in spaceship-2? (b) two other spaceships are heading toward earth from opposite directions, at speeds of vz-0.8c and va-0.9c relative to earth. what is the speed of spaceship- 4 as seen from the captain in spaceship-3? (c) if spaceship-1 is 0.3ly (1 ly-1 lightyear, the distance light travels in one year) away from earth, how much older (in seconds) will be: (i) the observer, and (ii) the captain, once the spaceship has landed on earth?

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

1134567 a jet with mass m = 1.1 ă— 105 kg jet accelerates down the runway for takeoff at 2 m/s2. 1) what is the net horizontal force on the airplane as it accelerates for takeoff? 2.2*10^5 n your submissions: 2.2*10^5 computed value: 220000submitted: saturday, january 26 at 2: 41 pm feedback: correct! 2) what is the net vertical force on the airplane as it accelerates for takeoff? 0 n your submissions: 0 computed value: 0submitted: saturday, january 26 at 2: 41 pm feedback: correct! 3) once off the ground, the plane climbs upward for 20 seconds. during this time, the vertical speed increases from zero to 21 m/s, while the horizontal speed increases from 80 m/s to 95 m/s. what is the net horizontal force on the airplane as it climbs upward? n 4) what is the net vertical force on the airplane as it climbs upward? n 5) after reaching cruising altitude, the plane levels off, keeping the horizontal speed constant, but smoothly reducing the vertical speed to zero, in 13 seconds. what is the net horizontal force on the airplane as it levels off? n 6) what is the net vertical force on the airplane as it levels off?

1) what is the power in horsepower of a 100 watt light bulb? what is the power in kilowatts of a 200 horsepower engine? 2) if a cars engine is providing 3000 n of force to keep the car moving at 5 m/s, what is the engine’s effective power? 3) how many gallons of water will be pumped from a well 30 feet deep by a 1/2 hp engine in 1 minute? (1 gallon weighs 8.34 pounds)