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The figure shows a person whose weight is W = 658 N doing push-ups. Find the normal force exerted by the floor on
(a) each hand and
(b) each foot, assuming that the person holds this position.
Scientists have recently shown that a sample of cocaine can be traced to its country of origin by measuring the ration of carbon-13 to nitrogen-15 (both naturally occuring, stable nuclides) in the cocaine sample.
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
A 55.8-kg high-school student hangs from an overhead bar with both hands. What is the tension in each arm when the arms make an angle of 38.00 o with respect to the vertical
Light in a transparent material (index of refraction 1.333) strikes the boundary with another transparent material (n = 1.010). compute the critical angle for total internal reflection
A 6000 ohm resistor is joined in series with a 70 uF capacitor. what is the capacitive time constant of this combonation
In a car collision, the driver's body must change speed from a high value to zero. This is true whether or not an airbag is used, How does it reduce injury
Three charged particles are placed at each of three corner of an equilateral triangle whose sides are of length 2.5 c.m. What is the net electric force acting on particle
A camera takes a perfectly exposed picture when the lens diaphragm is set to f/4 and the shutter speed is 1/250 s, what should the new shutter speed be so that the exposure is still correct
A -19 mC charge experiences a force of 60 N directed south. What is the electric field magnitude and direction at the location of the charge
A proton is initially at rest at a point where the potential is 515V. Sometime later the proton is at a point where the potential is 190V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.
A transformer has 590 primary and 170 secondary turns. An alternating potential of 90 V is applied to the primary
2150 kg satellite is in a circular orbit 780 km (780 x 103 m) above the surface of the earth. What is the speed of the satellite in its orbit
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