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Your friend has a near point of 129 cm, and she wears contact lenses that have a focal length of 36.3 cm. How close can she hold a magazine and still read it clearly?
cm
A 9 V battery is rated at 80 Ah. It can deliver a current of 80 A for one hour, or a current of 40 A for 2 hours, etc. What is the total energy stored in the battery
A 3m-long rigid beam with a mass 140 kg is supported at each end. An 75 student stands 2m from support 1.
An 85 kg man lowers himself to the ground from a height of 5.6 m by holding onto a rope that runs over a frictionless pulley to a 75 kg sandbag
A wrecking ball (weight = 5680 N) is supported by a boom, which may be assumed to be uniform and has a weight of 2520 N. compute the tension in the support cable
You walk 1140 m east and then 860 m south in a total time of 16 min. Compute your average velocity for east and south
An object weighing 338 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 302 N. Immersed in oil; object weighs 313 N. Calculate the density of the object.
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, Find the velocity (magnitude and direction) of the ball just before the collision
If the phase angle for a block-spring system in SHM is pi/6 rad and the block's position is given by x = xm cos(wt + pi). what is the ratio of the kinetic energy to the potential enery at time t = 0
A speed ramp at an airport is basically a large conveyor belt on which you can stand and be moved along. What is the speed at which the belt of the ramp is moving
A 120 kg mail bag hangs by a vertical rope 4.00 m long. A postal worker then displaces the bag to a position 2.10 m sideways from its original position, always keeping the rope taut.
A series RLC circuit is shown in the figure. The circuit is powered by an AC source. The peak emf of the AC source is 110 volt, What is the resonant frequency of this RLC circuit (in the unit of Hertz
The pulmonary artery, which connects the heart to the lungs, is 8.5 cm long and has a pressure difference over this length of 450 Pa. If the radius of the artery is reduced by 14% , by what factor is the blood flow rate reduced
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