mass m moves in a plane under the influence of a central force
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Q: In February 1955, a paratrooper fell 370 m from an airplane without being able to open his chute but…
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Q: A warehouse worker is pushing a 90.0 kg crate with a horizontal force of 291 N at a speed of v =…
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Q: A warehouse worker is pushing a 90.0 kg crate with a horizontal force of 283 N at a speed of v =…
A: See below
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- Find the minimum initial speed of a projectile in order for it to reach a height of 2145 km above the surface of the earthA warehouse worker is pushing a 90.0 kg crate with a horizontal force of 276N at a speed of v = 0.875m/s across the warehouse floor. He encounters a rough horizontal section of the floor that is 0.75 m long and where the coefficient of kinetic friction between the crate and floor is 0.353. (a) Determine the magnitude and direction of the net force acting on the crate while it is pushed over the rough section of the floor. magnitude Ndirection ---Select--- up down in the same direction as the motion of the crate in the opposite direction as the motion of the crate (b) Determine the net work done on the crate while it is pushed over the rough section of the floor. J (c) Find the speed of the crate when it reaches the end of the rough surface. m/sA rifle bullet with a mass of 5 g traveling toward the right at 206 m/s strikes a large bag of sand and penetrates it to a depth of 0.3 m. Determine the magnitude and direction of friction force (assume constant) that acts on the bullet.
- In February 1955, a paratrooper fell 360 m from an airplane without being able to open his chute but happened to land in snow, suffering only minor injuries. Assume that his speed at impact was 52 m/s (terminal speed), that his mass (including gear) was 80 kg, and that the force on him from the snow was at the survivable limit of 1.2 x 105 N. (a) What is the minimum depth of snow that would have stopped him safely? m (b) What is the magnitude of the impulse on him from the snow? kg-m/sThree point particles are fixed in position in an xy plane. Two of them, particle A of mass 5 g and particle B of mass 11 g, are shown in the figure with a separation of dAB = 0.579 m at angle = 30°. Particle C, with mass 8 g, is not shown. The net gravitational force acting on particle A due to particles B and C is 2.02 x 10-¹4 N at an angle of -163.8��. from the positive x axis. What are (a) the x coordinate and (b) the y coordinate of particle C? B dAB 0 AExplorers in the jungle find an ancient monument in the shape of a large isosceles triangle as shown. The monument is made from tens of thou- sands of small stone blocks of density = 800 kg/m3 . The monument is 15.7 m high and 64.8 m wide at its base and is everywhere 3.60 m thick from front to back. Before the monument was built many years ago, all the stone blocks lay on the ground. (a) Choosing a coordinate system with x = 0 at the center of the pyramid, y = 0 at the base of the pyramid, and z = 0 at the face of the pyramid shown in the diagram, determine the coordinates of the center of mass of the pyramid in the x, y, and z directions. (b) How much work did laborers do on the blocks to put them in position while building the entire monument? Note: The gravitational potential energy of an object–Earth system is given by Ug = MgyCM, where M is the total mass of the object and yCM is the elevation of its center of mass above the chosen reference level.