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A long slender bar is made from an unknown material. The length of the bar is 0.752 m, its cross-sectional area is 1.48 × 10-4 m2, and its mass is 2.49 kg. A sound wave travels from one end of the bar to the other end in 2.30 × 10-4 s. Find the Young's modulus of the unknown material.
A man pushes a wooden crate on wooden floor. The direction of the force is 30o from the horizontal. How much force does he use in order to maintain a constant speed
What is the relationship between a vector and a coordinate system? Between a vector and the number line? What properties or values of a vector depend on the coordinate system used to express it?
A step-down transformer (turns ratio = 1:8) is used with an electric train to reduce the voltage from the wall receptacle to a value needed to operate the train. What is the current in the primary coil
Compute the magnitude and direction of the total gravitational force exerted on one sphere by the other three.
A solid conducting sphere with radius that carries positive charge is concentric with a very thin insulating shell of radius 2 that also carries charge . The charge is distributed uniformly over the insulating shell. Q: Find the magnitude of the elec..
A generator rotates at 95Hz in a magnetic field of 0.025T . It has 650 turns and produces an rms voltage of 180V, What is the area of each turn of the coil
The current in an RL circuit builds up to one-third of its steady state value in 3.80 s. Find the inductive time constant
A small solid sphere, with radius 0.25 cm and mass 0.70 g rolls without slipping on the inside of a large fixed hemisphere with radius 23 cm and a vertical axis of symmetry. What is its kinetic energy at the bottom
What must the charge (sign and magnitude) of a 1.43 g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 630.
A cargo plane is flying horizontally at an altitude of 11.5 km with the speed of 820 km/h when a large crate falls out of the rear loading ramp. (Ignore any effects due to air resistance.)
A bulldozer pushes a large rock, and the two move forward together. The bulldozer does 1500 J of work on the rock. How much work does the rock do on the bulldozer
A 47.60 g golf ball is driven from the tee with an initial speed of 56.0 m/s and rises to a height of 28.4 m. (a) avoid air resistance and determines the kinetic energy of ball at its highest point. (b) What is its speed while it is 8.02m below it..
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