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The rotating blades exert a force on originally stationary air causing it to move downwards towards the ground gaining momentum in the process. No external force acts and as a result there is an upward force?
The velocity vs. time curve of an object is an increasing straight line. You observe when the time is 1 second that the velocity is equal to 3 m/s, What is the acceleration of the object
What supplies the force to keep an object in circular motion for a car on a turn, a ball on a string twirled in a circle, a satellite? Each situation has a different force responsible for the motion, list each separately.
At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. What is the radius of a chamber
An object with mass m1 = 4.90 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley, Find the magnitude of the acceleration of each object
If a projectile is launched horizontally (launching angle = 0.0) at a height of y above the table top, and it falls on the table top, How long does it take the projectile to fall onto the table top
A 2294 kilogram sample of water at 0oC is cooled at -36oC, and freezes in the process. Determine how much heat is liberated
The pulmonary artery, which connects the heart to the lungs, is about 8.0 cm long and has an inside diameter of 5.0 mm. what is the required pressure difference over its length
How much energy is required to accelerate a spaceship with a rest mass of 112 metric tons to a speed of 0.445 c? Every day our Earth receives 1.55×1022 J energy from the Sun. If we were able to use 1.05 percent of this energy to accelerate spaceships..
Let's assume you sent an idealized pulse of 337 nm light (from the N2 laser) with zero temporal width into the fiber. Calculate the minimum and maximum flight times using ray approximations and thereby report the broadening due to the fiber geomet..
7_feet_Dirk is shooting a basketball with 37angle at a distance X=8.4m from his hands to the rim. The basketball rim is with a height Y=10.0ft, what is his launching speed if his hands have the same position with his height?
A boy throws directly downward in ideally elastic ball from theheight 4.80m. If the initial speed of the ball is 4.4m/s, what is the speed when it hits the floor
two guns a and b located at xa 0 and xb 1.5 km fire at an approaching rocket. gun a fires at t 0 gun b fires at t
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