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A highway curve with radius 900 is to be banked so that a car traveling 56.0 will not skid sideways even in the absence of friction. At what angle should the curve be banked?
A 20.0cm -diameter cylinder of helium gas is 50.0cm long and at 30.0 ?C. The pressure gauge reads 130psi, How many helium atoms are in the cylinder
An object placed on an equal-arm balance scale requires 12 kg to balance it. When object is placed on a spring scale, the spring scale reads 12 kg.
A 150 ohm resistor is connected in series with a 0.250 H inductor. The voltage across the resistor is VR = 3.80 cos (720t) Volts. Derive an expression for the voltage VL across the inductor
A magnetic fi eld is oriented at an angle = 60 degrees to the normal of a rectangular area. If the magnetic fi eld has a strength of B = 4*10^-3T, what is the area of a rectangle
The coefficient of static and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box
An Atwood machine consists of two masses, = 7.1 and = 8.7 , linked by a cord that passes over a pulley free to rotate about a fixed axis. The pulley is a solid cylinder of radius = 0.40 and mass 0.70 .Determine the magnitude of the acceleration of..
two semicircular filament have a common diameter. one lies in the x-y plane and one in the x-z plane. the curved portion of each carries a uniform line charge density (rho). find the electric filed at the common cetner of the semicircles
A 0.144 kg baseball is moving towards home plate with a speed of 43.0 m/s when it is bunted. The bat exerts an average force of 6.50 Ã? 103 N on the ball for 1.30 ms, What is the final speed of the ball
A mortar* crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action. How fast will the shell be traveling when it hits the ground
A certain red giant star has a luminosity of 100,000 times that of the Sun and is located 600 light-years from Earth. calculate the rate of interstellar extinction in the direction of the star
An electron is in the ground state of an infinite square well. The energy of the ground state is E1 = 1.11 eV. What is the width of the square well
An arrow is shot from a height of 1.9 m toward a cliff of height H, what is the height of the cliff in meters and what is the max height of the arrow along its trajectory in meters
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