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Solve the all parts of given problem:
Problem: A 25kg child swings on a playground swing. If the swing hands down 2m from the top bar, and the child swings out 10 degrees,
Part A: What is the height above ground of the child at this angle?
Part B: What is the change in potential energy of the child?
I need help to solve the above problem and the swing is initially 0.75m off the ground.
A certain car battery with a 12.0 V emf has an initial charge of 115 A·h. Assuming that the potential across the terminals stays constant until the battery is completely discharged, for how various hours can it deliver energy at the rate of 110 W.
Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.7 kg · m2 and an angular velocity of +7.0 rad/s. Disk B is rotating with an angular velocity of -9.6 rad/s. The two disks are then linked together without the aid of a..
Two 0.65-m-long conducting rods are rotating at the same speed in opposite directions, and both are perpendicular to a 4.8-T magnetic field. what is the angular speed (in rad/s) of the rods when a spark jumps across the gap
A stunt pilot is attempting to drop a water balloon from a moving airplane onto a target on the ground. what angle does its velocity make with the horizontal
Using the idea of a dozen as an example again, if you have 2 dozen blocks and their total mass is 48 kg, What is the mass of a single molecule
A horizontal pipe of diameter 120 mm has a constriction of diameter40 mm. The velocity of water in the pipe is 60 m/s and the pressureis 150 kPa. What is the pressure in the constriction
A convex mirror has a radius of curvature of 42 centimeter. Estimate how far is the object from the mirror
The tub of a washer goes into its spin cycle, starting from rest and gaining angular speed steadily for 9.00 s, how many revolutions does the tub turn while it is in motion
A 1.0-cm-thick layer of water stands on a horizontal slab of glass. What is the ray's direction of travel in the glass
A gun tilted upward at 41 degrees above the horizontal fires a bullet by a speed of 216 m/s. The bullet travels as a projectile and lands at the same height as the gun. Ignoring air resistance, answer the following. What is the magnitude of the veloc..
A body is dropped from rest and falls freely. Determine the position and speed of the body after 1.0, 2.0, 3.0 and 4.0 s have elapsed
A 13.0-g wad of sticky clay is hurled horizontally at a 90-g wooden block initially at rest on a horizontal surface. The clay sticks to the block. what was the speed of the clay immediately before impact
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