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Q. The rotational inertia of a collapsing spinning star changes to 1/3 its initial value. What is the ratio of the new rotational kinetic energy to the initial rotational kinetic energy (KEnew / KEi)?
Q. A collimated beam of microwaves impinges on a metal screen that contains a long horizontal slit that is 20 cm wide. A detector moving parallel to the screen in the far-field region locates the first minimum of irradiance at an angle of 36.87° above the central axis. Determine the wavelength of the radiation.
At its Ames Research Center, NASA uses its large "20-G" centrifuge to test the effects of very large accelerations ("hyper gravity") on test pilots and astronauts. In this device, an arm 8.84 {rm m} long rotates about one end in a horizontal plane..
A second baseman tosses the ball to first baseman, which catches it at the same level from which it was thrown. The throw is made with an initial speed of 15 m/s at an angle of 38.0^circ above the horizontal. What is the horizontal component of ba..
A lightweight string of length 60cm is attached to the ceiling at points separated by distance. Three objects of equal mass are hung from the string, separating the string into 4 equal segments of length L. If θ = 40, find the measure of angle φ a..
Two plane mirrors facing each other are 10 m apart. A woman stands 3 m from one of the mirrors and looks at the mirror and sees two distinct images. How far are these images from the woman.
Net horizontal force due to rolling friction
Find the change in momentum of a 1080 {rm kg} car that increases its speed from 5.0 {rm m/s} to 14.5 {rm m/s} in a time of 11 {rm s} while travelling in the same direction.
You're driving down the highway late one night at 20 m/s while a deer steps onto the road 44m in front of you. Your reaction time before stepping on the brakes is 0.50 s, and the maximum deceleration of your car is 11m/s^2 .How much distance is be..
The critical angle for a special type of glass in air is 41.8. The index of refraction for water is 1.33. What is the critical angle if glass is immersed in water.
The coefficient of static friction between the 3000 lb car's tires and the road is 0.5. Determine the steepest grade the car can drive up at constant speed if car has (a) rear=wheel drive; (b) front-wheel drive; (c) four wheel drive.
A 6 ornament is hanging by a 1.30 wire when it is suddenly hit by a 3.00 missile travelling horizontally at 10.0. The missile embeds itself in the ornament throughout the collision.
An electron with initial velocity v0 = 1.20 × 10^5 m/s enters a region 1cm long where it is electrically accelerated. It emerges with velocity v = 5.87 × 10^5 m/s. What is its acceleration, assumed constant? (Such a process occurs in conventional ..
calculate the total mechanical energy of the glider at any point in its motion. Calculate the maximum speed of glider.
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