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A railroad car of mass 3.5*10^4 kg moving at 2.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s.(a) What is the speed of the three coupled cars after the collision?(b) How much kinetic energy is lost in the collision? (joules)
A box of mass 38.5 kg is sitting on a horizontal table top with a coefficient of kinetic friction between the box and the surface of 0.49. Find the magnitude of the acceleration of the box on the table
As part of a safety investigation, two 1900 {rm kg} cars travelling at 19 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.8 {rm s} to stop, and (b) car that hits a..
A certain kind of glass has an index of refraction of 1.660 for blue light of wavelength 430 nm, what is the angle between the two beams inside the glass
If an piece of Iron (c = 450 J/kg C) at 65.00 C is dropped into .250 kg of ethyl alcohol at 25.00 C and the final temperature of the two comes to 35.00 C what was the mass of the piece of iron
A screen is placed 51.0 cm from a single slit that is illuminated with light of wavelength 677 nm. If the distance between the first and third minima in the diffraction pattern is 2.80 mm, what is the width of slit.
A tennis player standing 12.6 m from the net hits the ball at 2.79° above the horizontal. how fast was the ball moving when it left the racket
A diverging lens (f = -11.0 cm) is located 19.0 cm to the left of a converging lens (f = 30.0 cm). What is the height of the final image (including the proper algebraic sign)
The largest apple pie ever made was rectangular in shape and had an area of 7m× 12m. Consider a parallel-plate capacitor with this area. Imagine that the capacitor is filled with air and the distance between the plates is 1mm. a.
Fifty grams (50g) of hot water at 90 degrees C are mixed with 70g of cold water at 20 degrees C. What is the final temperature of the mixture when it reaches equilibrium
A 3.9 kg stone is tied to a 5.8 m long string and swung around a circle at a constant angular velocity 1.7 1/s. Find the magnitude of the torque about the origin
For the third circuit, consisting of a single battery and two light bulbs in parallel, how does the brightness of the bulbs compare to the first circuit, What is the current through each bulb
A snow maker at a resort pumps 260 kg of lake water per minute and sprays it into the air above a ski run. how much heat does the snow-making process release each minute
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