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Question: Train A has length L. Train B moves past A (on a parallel track, facing the same direction) with relative speed 4c/5. The length of B is such that A says that the fronts of the trains coincide at exactly the same time as the backs coincide. What is the time difference between the fronts coinciding and the backs coinciding, as measured by B?
Two infinitely large sheets of charge are vertical, parallel to each other, and 24.0 cm apart. One of the sheets has a charge density of +4.60 x 10 -7 C/m2. Calculate the unknown sheet's surface charge density
A large trucks runs into a fly while driving at 60 mph. What is true about the forces between the truck and the fly, and the fly and the truck, determine which force is larger
A rifle of 8lb fires a bullet weighing 0.8oz which leaves the rifle with a muzzle velocity of 2000 ft/s. What is the recoil velocity of the rifle?
You are assigned the design of a cylindrical, pressurized water tank for a future colony on Mars, Find the net downward force on the tank's flat bottom, of area 2.45m2 , exerted by the water and air inside the tank and the air outside the tank
A certain string just breaks while it is under 25 N of tension. A boy uses this string to whirl a 0.75-kg stone in a horizontal circle of radius 2.00 m. The boy continuously increases the speed of the stone. At about what speed will the string bre..
A person on earth notices a rocket approaching from the rightat a speed of 0.75c and another rocket approaching from the left at0.65c. What is the relative speed between the two rockets
an ice skater is moving forward at a steady speed of 10 ms in a straight line. show and explain your calculation in
Determine the differences in potential VBA=VB-VA, VCB =VC-VB, and VCA=VC-VA
Bats use echolocation to determine their distance from objects they cannot easily see in the dark. how close was she to the wall when she received the echo
A dentist uses a small mirror of radius 44mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 13 mm from the tooth, what is magnification of the image.
A person pulls on the tether of a suitcase with a force of 15N at an angle of 60 degrees with the horizontal. what is the work done by friction in the same distance
Suppose that a projectile which is subject to a linear resistive force is thrown vertically down with a speed Vyo which is greater than the terminal speed Vterm. Describe and explain how the velocity varies with time and make a plot of Vy against t f..
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