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A car starts from rest and accelerates at a rate of 9 m/s2
for 4 seconds and then accelerates (brakes) at a rate of -3 m/s2for 2 seconds. How far did the car travel in 6 s?
Styrofoam has a density of 150 kg/m3. What is the maximum mass that can hang without sinking from a 50-cm diameter Styrofoam sphere in water
A child pulls on a wagon handle at an angle 37° above the horizontal with a force of 45 N. what is the mass of the wagon
A radioactive nuclide produces 2880 decays per minute at one time, and 1.52 hr later produces 738 decays per minute. What is the half-life of the nuclide
A car travelling at 23 m/s runs out of gas while travelling up a 20 degree slope. How far up the hill will it coast before starting to roll back down.
Suppose a speck of dust in an electrostatic precipitator has 2.0×1012 protons in it and has a net charge of -53 nC (an extremely large charge for a small speck). How many electrons does it have
The drawing shows a device that can be used to measure the speed ofa bullet. The device consists of two rotating disks, separated by adistance of d = 0.750 m, and rotating with an angular speed of 70.0rad/s.
A block of mass M = 0.8 kg hangs at the end of a massless spring. What is the new equilibrium extension of the spring
A potential difference V is applied to a wire ofcross-section area of 1 unit, length 1 unit, and conductivityσ. You want to change the applied potential differenceand draw out the wire so the power dissipated is increased bya factor of 30 and the ..
A positive charge of0.00013 Cexperiences a force of 0.274 N when located at acertain point. What is the electric field intensity at that point
A wheel is spinning freely on its axis with an angular velocity, w, of 1 rad/s. It has a kinetic energy of 10 Joule. Find what will its kinetic energy be if the angular velocity is 5 rad/s
A gamma-ray telescope intercepts a pulse of gamma radiation from a magnetar, a type of star with a spectacularly large magnetic field. Obtain the magnitude of the rms magnetic field of the gamma-ray pulse at the surface of the magnetar
A long horizontal wire carries 13.0 A of current due north. Calculate the angle relative to the horizontal with up as the positive direction
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