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A 2.9-kg cart is rolling along a frictionless, horizontal track towards a 1.6-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts collide, the first cart's velocity is +3.9 m/s, and the second cart's velocity is -1.1 m/s. (a) What is the total momentum of the system of the two carts at this instant? (b) What was the velocity of the first cart when the second cart was still at rest?
A hollow cone (like a party hat) has vertex angle 2?, slant height L, and surface charge density ?. It spins around its symmetry axis with angular frequency ?. What is the magnetic field at the ti
A 220, 45.0-cm-diameter turntable rotates on frictionless bearings at 55. A 21.0 block sits at the center of the turntable. A compressed spring shoots block radically outward along a frictionless groove in the surface of the turntable.
Therefore of his observations, Ole Roemer concluded that eclipses of Io by Jupiter were delayed by 22 min throughout a six-month period as the Earth moved from the point in its orbit where it is closest to Jupiter to the diametrically opposite point ..
What is the net upward force on an airplane wing of area 20.7 m2 if the speed of air flow is 232 m/s across the top of the wing and 215 m/s across the bottom? (The density of air where the airplane flies is ρair = 1.21 kg/m3.)
An open organ pipe has its fundamental frequency at 320 Hz. The first overtone of a closed organ pipe has the same frequency as the first overtone of the open pipe, How long (in meters) is the closed pipe
Waterslides are nearly frictionless, hence can provide bored students with high-speed thrills. If Kevin is clocked at 25 m/s at the bottom of the slide, find the work done on him by friction
The turntable of a record player rotates initially at 33rev/min and takes 20 s to come to rest. what is the angular acceleration of the turn table
exploring creation with physics 2nd edition module 14 practice problem 7 a 3.8mc charged particle m5.0kg is shot with
use the inverse square law to display that in space shuttle territory, 200 kilometers above earth's surface, the force of gravity on a shuttle is about 94 percent of that at earth's surface.
A copper bar of thermal conductivity 401 W/(m · K) has one end at 104° C and the other end at 33° C. What is the temperature gradient in the bar
the record distance in the sport of throwing cowpats is 81.1 m. assuming the initial launch angle was 45deg and
An Australian emu is running due east in a straight line at a speed of 17.5 m/s and slows down to a speed of 12.2 m/s in 4.1 s. (a) What is the direction of the bird's acceleration? (b) Assuming that the acceleration remains the same, what is the ..
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