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An 18-year-old runner can complete a 10.0 km course with an average speed of 4.57 m/s. A 50-year-old runnercan cover the same distance with an average speed of 4.42 m/s. How much later (in seconds) should the younger runner start in order to finish the the course at the sametime as the older runner?
The loaded cab of an elevator has a mass of 3.0 x10^3 kg and moves 236 m up the shaft in 23s at constant speed. At what average speed does the force from the cable do work on the cab?
A light ray strikes this material (from air) at an angle of 34.7° with respect to the normal of the surface. Calculate the angle of the reflected ray
Construction cranes are able to balance heavy loads by using a counterweight. The crane operator can slide the entire torque arm horizontally in order to balance the load.
explain the shape of the distribution of sample means.
A certain laboratory experiment requires an aluminum wire of length of 22.0 m and a resistance of 2.40 ? at 20.0°C. What diameter wire must be used
A thin uniform rod (mass = 0.95 kg) swings about an axis that passes through one end of the rod and is perpendicular to the plane of the swing. What is the maximum kinetic energy of the rod as it swings
A railroad car of mass 2.00 x 10^4 kg moving at 3.00 m/s collides, What is the speed of the three coupled cars after the collision
Water flowing in a horizontal pipe is at a pressure of 1.55 105 Pa at a point where its cross-sectional area is 6.00 m2. Find the water's speed in the wider pipe
A series ac circuit consists of a voltage source of frequency f=60 Hz and source voltage amplitude 345 volts, a resistor of resistance R=335 ohms, what is the current amplitude in the circuit
A rifle with a barrel length of 58 fires an 11 bullet with a horizontal speed of 370. The bullet strikes a block of wood and penetrates to a depth of 15.
An automobile has a mass of 1690 kg and a velocity of 23.8 m/s. It makes a rear-end collision with a stationary car whose mass is 2100 kg. determine how far the cars skid before coming to rest
The mass of a roller-coaster car, including its passengers, is 495kg. Its speed at the bottom of the track in the figure below is 17.00 m/s. The radius of this section of track is r1 = 26 m. Find the force that a seat in the roller-coaster car exerts..
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