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Two railroad freight cars with masses 110 Mg and 140 Mg approach with equal speeds of 0.350 m/s. They collide, the lighter car rebounding opposite its original direction at 0.330 m/s. A) Find the velocity of the heavier car after the collision. Assume the original direction of the lighter car is positive. (Express your answer to two significant figures and include the appropriate units.) B) What fraction of the original kinetic energy was lost in this inelastic collision? (Express your answer using two significant figures.)
A student eats a candy bar that may give 1.8 * 10^6 joules of energy. if the student has a mass of 60 kg, how high will he have a climb a ladder to offset completely the energy contained in the candy bar.
A scaffold of mass 60 kg and length 6.5 m is supported in a horizontal position by a vertical cable at each end. What is the tension in the cable closer to the painter
Suppose you are planning a trip in which a spacecraft is to travel at a constant velocity for exactly nine months, as measured by a clock on board the spacecraft, and then return home at the same speed. Upon return, the people on earth will have a..
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.10×106N , one at an angle 10.0? west of north, What is the total work done by the two tugboats on the supertanker
An ice skater is traveling in a straight, horizontal line on the ice with a velocity of v=5.5m/s in the positive x direction. Write an expression for the normal force, F_n, that the ice pushes against both skates together
A block with a mass of 0.148 kg is traveling at 8.4 m/s on a horizontal, frictionless surface when it hits a spring with a spring constant of 722 N/m. What is the maximum amount the spring is compressed
A gun fires a bullet with muzzle velocity 0.6c. If an alien is on a spaceship which moves at 0.8c and fires the gun in the forward direction, what is the bullet's velocity according to you
A person decides to use an old pair of eyeglasses to make someoptical instruments. What is the maximum angular magnificationhe can produce in a telescope
Two thermally insulated reservoirs each contain 2 kg of water at temperatures of 80 °C and 20 °C respectively, Determine the find equilibrium temperature and find the change in entropy of the local universe in the mixing process
A negative charge of -0.550 exerts an upward 0.225 force on an unknown charge 0.285 directly below it. what is unknown charge
When a 2.00-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.89 cm. If the 2.00-kg object is removed, how far will the spring stretch if a 1.00-kg block is hung on it
As you eat your way through a bag of chocolate chip cookies, you observe that each cookie is a circular disk with a diameter of 8.50 ± 0.02 \rm cm, Find the ratio of the diameter to the thickness
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