7 kg 3 kg 49° 53° There is no friction in the system above except between the rope and the pulley so that the rope does not slip on the pulley. The pulley is a uniform spherical shell with a mass of 1.43 kg and radius of 12 cm, and the rope does not slip on the pulley. The system is released from rest. Use work-energy principles to determine 2.3 meters how much kinetic energy does the smaller mass have after moving d parallel to the ramp? K
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- a) A person is riding on a Ferris wheel of radius R. He starts at the lowest point of the wheel. When the wheel makes one complete revolution, is the net work done by the gravitational force positive, zero or negative? Do you need to know how the speed of the person changed before you can answer the question? b) Suppose the person started at the highest point of the wheel. What is the net work done by the gravitational force when he reaches the lowest point?A 280-N child is in a swing that is attached to a pair of ropes 1.90 m long. Find the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal (+) when the ropes make a 31.0° angle with the vertical (c) when the child is at the bottom of the circular arcA 440-N child is in a swing that is attached to a pair of ropes 1.90 m long. Find the gravitational potential energy of the child–Earth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal(b) when the ropes make a 35.0° angle with the vertical(c) when the child is at the bottom of the circular arc
- 29 Question 5 0 In which of the following situations would the capacity to do work be greatest? A Note: Omega is angular velocity, ^ is the symbol for power, eg ^2 means the variable is squared $ 10 O1-10 kgm^2 omega = 2.5 rad/s 1 m 14 3:11 www..c O1-15 kgm^2 omega = 1 rad/s Om- 15 kg v = 2 m/s 16 20 kg h = 0.10 m 49 6 E & 4- 7 18 * 4+ 8 hp fo 9 ho 20 pts ? 74°FComputation. The figure shows two blocks, released from rest, connected by a light string passing without slipping over a pulley with moment of inertia 0.032 kg-m² and radius 0.1 m. The coefficient of kinetic friction between the block and the table is 0.38. Using energy methods, find the blocks' speed after they have moved 0.22 m if M = 5.2 kg and m = 7.3 kg. V= M 11 m/s m Record your numerical answer below, assuming three significant figures. Remember to include a as necessary. 31 6:37 PA 360-N child is in a swing that is attached to a pair of ropes 2.10 m long. Find the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal (b) when the ropes make a 31.0° angle with the vertical (c) when the child is at the bottom of the circular arc
- A basketball is rolling down a hill. When you start watching it, it has a total energy of -11 Joules. When it reaches the bottom of the hill, it has a vertical position of -6 meters. If the basketball weighs 0.6 kg, what is the kinetic energy in units of Joules of the basketball when it reaches the bottom of the hill? Assume the system is closed and the effects of friction are negligible. Recall that g = 10mQuestion Four forces (measured in Newtons) act on a crate. The forces are given by the vectors: F₁ = 2121-136ĵ+ 241k N, F₂ = 108î+ 144) + 189k N. F3 = -400 + 180) + 240k N, and F₂ = -270k N Given: The magnitude of the resultant force = 449.2 N. The work done by the force F is 770.3J. The moment of the force F₂ = (-108î - 180k) N/m a) What is the angle (in degrees to 2 decimal places) between the force vectors F₂ and F3? b) What is the force vector, F, that acts in the opposite direction to the force F₂ and has magnitude of 203 Newtons?Please help me with this question. Thank you
- 1. Work in 2-D. A particle is given a displacement Δr = (2.0m)i – (5.0m)j along a straight line. During the displacement, a constant force F = (3.0N)i + (4.0N)j acts on the particle. (a)Find the work done by the force, and (b) the component of the force in the direction of the displacement. 2. Work-Kinetic Energy Theorem. A truck of mass 3000 kg is to be loaded onto a ship by a crane that exerts an upward force of 31.0 kN (kilo Newtons) on the truck. This force, which is just strong enough to get the truck started upward, is applied over 2.00 m. Find (a) the work done by the crane, (b) the work done by gravity, and (c) the upward speed of the truck after 2.00 m. 3. Law of Conservation of Energy. Two snow-covered peaks are at elevations of 862 m and 741 m above the valley between them. If a skier starts from rest on the higher peak and just coasted down without exerting any effort, at what speed would he arrive at the lower peak? 4. Power and Kinetic Energy (PΔt = ΔK). A new…The kinetic energy of a system must always be positive or zero. Explain whether this is true for the potential energy of a system.The motor of a ski boat generates an average power of 5.26 x 104 W when the boat is moving at a constant speed of 11.6 m/s. When the boat is pulling a skier at the same speed, the engine must generate an average power of 9.82 x 104 W. What is the tension in the tow rope that is pulling the skier? Number eTextbook and Media Save for Later Units Attempts: 0 of 5 used Submit Answer