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A freight train is rolling down the track at 65.0km/hr. Out ofthe fog, 1km behind, a fast express going 120km/hr, appears on thesame track. The Express engineer slams on the brakes. With thebrakes set, he needs 3.00km to stop. Will the express rear-end thefreight train or will the express train be able to AVOID acrash?
Two radio antennas operating at 6.00 Mhz are separated by 120.0m along a North-South line. Find the directions on the compass in which no radiation is sent out
A 81.0kN spaceship comes in for a vertical landing. From an initial speed of 1.00 km/s, What braking force must its rockets provide
A conductor carrying a current I = 14.7 A is directed along the positive x axis and perpendicular to a uniform magnetic field. A magnetic force per unit length of 0.131 N/m acts on the conductor in the negative y direction. (a) Determine the magnitud..
Raw sewage is raised vertically by 5.49m in the amountof 1.89*106 liters each day. What is the power output of the shift station pump
A 1870 kg truck traveling north at 37 km/h turns east and accelerates to 52 km/h. (a) What is the change in the truck's kinetic energy? (b) What is the magnitude of the change in its momentum?
A proton is passing the origin. The magnetic field at the (x,y,z) position ( 2mm , 0 mm, 0 mm) is1.4×10?13?^T. What is the speed of the proton
Two charged spheres are 15 cm apart. They are moved, and the force on each of them is found to have been quadrupled. How far apart are they now.
Sound is generated from standing waves in two tubes which are bothopen at both ends and are identical, apart from one tube havinglength L and the other tube being only seven eighths as long
Once a traffic light turns green, a car speeds up from rest to 50 mi/h with constant acceleration 9 mi/h • s. In the adjoining bike lane, a cyclist speeds up from rest to 20mi/h with constant acceleration 13mi/h.
A 20 kg uniform beam is placed on two supporting stands on either end. A 75 kg painter stands at 1.2 m from one of the ends. find the forces at the two supports
A jeweler working awith a heated 47 g gold ring must lower the ring's temperature to make it safe to handle. If the ring is initially at 99 C, what mass of water at 25 C is needed to lower the rings temperature to 38 c.
What is the electric force between a glass ball that has +2.9 µC of charge and a rubber ball that has -4.7 µC of charge when they are separated by a distance of 3.8 cm?
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