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A 95.0 kg person stands on a scale in an elevator. What isthe apparent weight in each of the following situations?(a)when the elevator is accelerating upward with an acceleration of1.80 m/s2?(b) when the elevator is moving upward at a constant speed?(c) when the elevator is accelerating downward with an accelerationof 1.10 m/s
Mercury flows through a horizontal pip 1.25 cm in diameter and 1.2 m long. what is the rate of flow through the tube
Gas is confined in a tank at a pressure of 9.0 atm and a temperature of 29.0°C. If two-thirds of the gas is withdrawn and the temperature is raised to 86.0°C, what is the pressure of the gas remaining in the tank?
If an average frequency emitted by a 200,-,rm W light bulb is 5.00 times 10^{14} , {rm Hz}, and 10.0 percent of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second .
A jet airplane in level flight has a mass of8.62104kg, and the two wings have an estimated total area of89.0m2. If the speed of air under the wings is232m/s, what is the speed of the air over the wings
An aluminum rod is 20.0 cm long at 20°C and has a mass of 350 g. If 12,500 J of energy is added to the rod by heat, what is the change in length of the rod
Someone steps on your toe, exerting a force of 300 N on an area of 1.1 cm2. What is the average pressure on that area in atm
What is the minimum energy of a 2.7 g Ping-Pong ball in a 10-cm-long box, What speed corresponds to this kinetic energy
A woman with mass 53.5 kg is standing on the rim of a large disk that is rotating at 0.510 rev/s about an axis perpendicular to it through its center. Calculate the magnitude of the total angular momentum
A 5000 kg helicopter accelerates upward at 0.50 m/s2 while lifting a 2000 kg car. What is the lift force exerted by the air on the rotors? Evaluate the tension in the cable that connects the car to the helicopter?
A 3 ohm resistor is mounted in parallel with a resistor R=11 ohm , and this combination is connected in series with an 4 ohm resistor and a 12 Volts battery. What is the current through the R resistor? Amp
The electrons in a rigid box emit photons of wavelength 1484 nm during the transition. How long is the box in which the electron are confined
Find the focal length of contact lenses that would allow a nearsighted person with a 145 cm far point to focus on the stars at night
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