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A man of mass 78.0 kg walks down the awe of an airplane at a speed...
The model airplane has a mass of 0.90 kg and moves at constant speed on a circle that is parallel to the ground. The path of the airplane and the guideline lie in the same horizontal plane because the weight of the plane is balanced by the lift generated by its wings. Find the tension in the 17 m guideline for a speed of 19 m/s.
An airplane starts from rest on the runway. The engines exert a constant force of 78.0 kN on the body of the plane (mass 9.20 × 104 kg) during takeoff. How far down the runway does the plane reach its takeoff speed of 74.7 m/s?
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.845 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant horizontal force of 292 N on the crate. A man pushes a crate labeled m, which moves with a velocity vector v to the right, on...
A man pushing a crate of mass m= 92.0 kg at a speed of v=0.880m/s encounters a rough horizontal surface of length l= 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.356 and he exerts a constant horizontal force of 293N on the crate, find the following.(a) Find the magnitude and direction of the net force on the crate while it is on the rough surface.magnitudeNdirection---Select---updownin the same direction as...
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.880 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.350 and he exerts a constant horizontal force of 287 N on the crate. (a) Find the magnitude and direction of the net force on the crate while it is on the rough...
A barge of mass M = 300 kg is floating on a lake (assume there are no forces between the barge and the water in the plane of the lake and that the water is not moving). The barge is moving at a velocity vo = 0.4 m/s along the +x direction. As the barge floats by, a man of mass m = 90 kg standing at the edge of the lake takes a running start and jumps in the...
A merry-go-round rotates at the rate of 0.15 rev/s with an 85-kg man standing at a point 2.0 m from the axis of rotation. (a) What is the new angular speed when the man walks to a point 0.9 m from the center? Assume that the merry-go-round is a solid 25-kg cylinder of radius 2.0 m. (b) Calculate the change in kinetic energy due to this movement. J How do you account for this change in kinetic energy? -Work is...
25. A block of mass 25 kg is sliding down an inclined plane at a speed of 5.0 m/s when it passes point A Point A is 5.0 m above the ground. The incline plane makes an angle of 46e above the horizontal. Point B is 1.5 m above the ground The coefficient of kinetic friction is 0.30. Find the speed of the block, in m/s, at point E.
5. Two figures depict a man holding a dumbbell of mass 5.0 kg in each hand while spinning on a rotating stool. In figure (a), the man's arms are fully extended a distance 1.00 m from the axis of rotation. He is rotating with angular speed w; = 0.250 rad/sec. In figure (b), the man's arms are pulled in so the dumbbells are 0.10 m from the axis of rotation. Find the final angular speed w;if the moment of inertia...
A particle of mass 1.67Ý10-27 kg moves with a speed of 2.6Ý108 m/s relative to an observer. What is the kinetic energy of the particle in the rest frame of the observer?