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A 27.0-kg child on a 1.00-m-long swing is released from rest when the ropes of the swing make an angle of 25.0° with the vertical. (a) Neglecting friction, find the child's speed at the lowest position. m/s (b) If the actual speed of the child at the lowest position is 1.20 m/s, what is the mechanical energy lost due to friction? J
You push a crate across a rough floor against a constat force of friction. You first push with a force of 35N, the acceleration of the box is 0.80m/s^2; Find the mass of the box
Two waves are described by the following wave functions y1(x,t) = 3.50 sin (2.00x ? 10.0t) y2(x,t) = 12.00 cos (2.00x ? 10.0t) , find the amplitude and phase of this sinusoidal wave
A 30 kg launching machine fires a 250 gram projectile horizontally at 100 m/s. What was the momentum of the machine
The heat of vaporization of ethyl alcohol is about 200 cal/g. If 2.3 kg of it were allowed to vaporize in a refrigerator, how many grams of ice will be formed from 0°C water.
A toy is made with three equal masses of 100 grams in the vertices of an equilateral triangle of side 7 cm. Determine the position of the center of mass of this object
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern. How many electrons pass through the wires connected to the patient
The pressure inside a gas bottle at 24.7 °C is 3830 kPa. What will be the pressure inside the bottle
A uniform metal rod, with a mass of2.9kg and a length of0.9m, is attached to a wall by a hinge at its base. Find the horizontal component of the force exerted on the rod by the hinge
Two manned satellites approaching one another at a relative speed of 0.100 m/s intend to dock. The first has a mass of 2.50 ? 103 kg, What is the loss of kinetic energy in this inelastic collision
At some location, earths magnetic field is B earth= 0.52 gauses and points north, at 55.0 degrees below horizontal line. find the magnitude of the magnetic force on a 25 m long segment of power line
When resting, a person has a metabolic rate of about 6.16 x 105 joules per hour. The person is submerged neck-deep into a tub containing 2.51 x 103 kg of water at 24.3 °C. If the heat from the person goes only into the water, find the water temper..
To transmit only portions of an input wave lying on one side of an amplitude boundary, you would use a.
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