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A body travelling with uniform acceleration crosses two points A &B with velocities 30m/s & 50m/s the speed of the body at mid point of A&B is approximately?
A plane accelerates down a runway. Markers beside the runway are 9.5 m apart. The plane moves between two adjacent markers in 0.182 s. Estimate the instantaneous speed of the plane
a helicopter lifts a 61 kg astronaut 13 m vertically from the ocean by means of a cable. the acceleration of the
Two loudspeakers 5.0 m apart are playing the same frequency. If you stand 11.0 m in front of the plane of the speakers,centered between them, you hear a sound of maximum intensity
A 0.700 kg ball is on the end of a rope that is 1.30m in length.The ball and rope are attached to a pole and the entire apparatus,including the pole, rotates about the pole’s symmetry axis.The rope makes an angle of 70.0 degrees with respect to theve..
A single conservative force F(x) acts on a 2.9 kg particle that moves along an x axis. The potential energy U(x) associated with F(x) is given by U(x) = -3.8xe^-x/5, What is the mechanical energy of the system
Starting from rest, a basketball rolls from the top to the bottom of a hill, reaching a translational speed of 7.9 m/s. Ignore frictional losses. What is the height of the hill?
A river has a steady speed of 0.490 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point, If the student can swim at a speed of 1.10 m/s in still water, how long does the trip take
A neon sign utilizes a step-up transformer to run at 6000 V on the 120 V from the wall outlet. how many turns does the secondary coil have
a piece of thin spherical shell that has a radius of curvature of 94 cm is silvered on both sides. the concave side of
A machinist turns the power on to a grinding wheel, at rest, at time t = 0 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 66 rad/s. The wheel is run at that angular velocity for 37 s and then power is shu..
A person is doing strength training of knee extensor muscles. He sits on a bench, with a weight attached to his ankle. In what position of the leg will the gravitational torque about the knee joint be maximum?
A father racing his son has 1/4 the kinetic energy of the son, who has 1/3 the mass of the father.What are the original speeds of the father and son
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