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A 23 kg child goes down a straight slide inclined 38 above horizontal. The child is acted on by his weight, the normal force from the slide, kinetic friction, and a horizontal rope exerting a 30 degree force. How large is the normal force of the slide on the child? Express your answer using two significant figures.
A person is performing a knee extension exercise with a 100 N weight acting at the ankle. What is the torque at the knee necessary to maintain a knee joint angle of -60q relative to the right horizontal passing through the knee joint
A toy car with a mass of 120 g moves to the right with a speed of 0.62 m/s. A small child drops a 21.0-g piece of clay onto the car, What is the change in speed of the car
It is desired to cool iron parts from 500°F to 100°F by dropping them into water that is initially at 55°F. how many kilograms of water are needed per kilogram of iron
Two 2.50-cm-diameter disks spaced 1.70mm apart form a parallel-plate capacitor. The electric field between the disks is 5.00×105V/m. What is the voltage across the capacitor
A resonant circuit in a radio receiver is tuned to a certain station when the inductor has a value of 1.00 µH and the capacitor has a value of 1.90 pF. Find the frequency of the radio station
The angle of elevation theta is increased slowly from the horizontal. Illustrate at what value of theta does the block begin to slide (in degrees)?
Yusef pushes a chair of mass = 51.0 across a carpeted floor with a force (the subscript 'p' here is lowercase and throughout the question) of magnitude = 170 directed at = 35.0 below the horizontal. The magnitude of the frictional force between the c..
Suppose you wish to survey 16000 square degrees of the sky to some limiting brightness as fast as possible, but necessarily within some budgetary constraints. Further suppose that the cost of telescopes ~ (diameter of the primary mirror)2.5 and th..
When responding to sound, the human eardrum vibrates about its equilibrium position. What is the maximum acceleration of the eardrum
An asteroid, whose mass is 1.70×10-4 times the mass of Earth, Calculate the period of revolution of the asteroid in years
An electron has an initial velocity of 8.00 106 m/s in a uniform 7.00 105 N/C strength electric field. How long does it take the electron to come to rest
A 3.0-V battery with an internal resistance of 2.5 Ω is connected to a lightbulb of a resistance of 6.0 Ω. How much electric power is wasted in the internal resistance
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