A pendulum with L = 7.0 m suspends a 5.0 kg ball. The ball is pulled aside to angle θ0=30° and released. How much work is done on the ball by the gravitational force from the ball's point of release to its lowest point.
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A pendulum with L = 7.0 m suspends a 5.0 kg ball. The ball is pulled aside to angle θ0=30° and released. How much work is done on the ball by the gravitational force from the ball's point of release to its lowest point.
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- A roller coaster of mass 80.0 kg is moving with a speed of 12.0 m/s at position A as shown in the figure. The vertical height above ground level at position A is 10.0 m. Neglect friction. 10 m 7 m - Potential Energy 0 What is the total mechanical energy of the roller coaster at point A? 5760 J 2080 J 37000 J 7840 J Page 18 of 30 13600 JIn the figure, a block of mass m = 4.00 kg slides head on into a spring of spring constant k = 230 N/m. When the block stops, it has compressed the spring by 8.40 cm. The coefficient of kinetic friction between block and floor is 0.480. While the block is in contact with the spring and being brought to rest, what are (a) the work done by the spring force and (b) the increase in thermal energy of the block-floor system? (c) What is the block's speed just as the block reaches the spring? (a) Number -0.81 (b) Number 1.6 (c) Number i -1.1 Units J Units J Units m/sIn the figure, a constant external force P = 300 N is applied to a 20.0 kg box, which is on a rough horizontal surface. While the force pushes the box a distance of 8.00 m, the speed changes from 0.500 m/s to 2.60 m/s. The work done by friction during this process is closest to P 30° 20 kg -8.0 m O A. +2209 J ОВ.-1948 J OC.-2013 J O D.+1948 J O E. +2013 J
- I need help on this question?A very smooth plank of Length L = 2.0 m is evelated to an angel of beta = 30.0 degree above the horizontal. A small ice cube of mass m = 12g is placed at the top of the plane and let go with zero initial velocity. How long does it take for the ice cube to reach the bottom of the plank? How much work was done by gravity on the ice cube?A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 61.2-kg water-skier has an initial speed of 5.1 m/s. Later, the speed increases to 12.1 m/s. Determine the work done by the net external force acting on the skier.
- A 3.5-kg object falls vertically downward in a viscous medium at a constant speed of 1.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 50 cm? Question 11 options: +2.0 J -8.5 J +17 J −17.0 J −32 JA coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.70 m, 4.78 m) while a constant force acts on it. The force has magnitude 2.08 N and is directed at a counterclockwise angle of 100° from the positive direction of the x axis. How much work is done by the force on the coin during the displacement?A particle of mass 18.8 kg moves along the x-axis with a potential energy U whose dependence on position x is shown in the figure. If the total mechanical energy E of the particle is 110 J, what is the speed in m/s of the particle at 7 m? 15 U (J) 10 V. 5 4 8 10 X (m) 00 6. 20
- In the figure, a block of mass m = 3.70 kg slides head on into a spring of spring constant k = 370 N/m. When the block stops, it has compressed the spring by 13.0 cm. The coefficient of kinetic friction between block and floor is 0.300. While the block is in contact with the spring and being brought to rest, what are (a) the work done by the spring force and (b) the increase in thermal energy of the block-floor system? (c) What is the block's speed just as the block reaches the spring?An object of mass m starts at x = A with a speed vi in the +x direction. , where a is a positive 2. For x > A the surface has a coefficient of friction µ(x) constant. Calculate the work done by friction from x = A to an arbitrary point x = B along the box's path of motion. What is the object's kinetic energy at x = B? m Law V1 x = A µ(x) ApplicationA bicyclist starting from rest applies a force of F = 239 N to ride his bicycle across flat ground for a distance of d = 210 m before encountering a hill making an angle of θ = 17 degrees with respect to the horizontal. The bicycle and rider have a mass of m = 120 kg combined. In this problem, you can ignore air resistance and other losses due to friction.How much work, W in joules, did the rider do before reaching the hill? What is the bicycle's speed, v in m/s, just before the hill? If the cyclist starts coasting at the bottom of the hill, what distance, di in meters, does the bike travel up the incline?