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Question: Apparent Weight, A 550-N physics student stands on a bathroom scale in an 850-kg (including the student) elevator that is supported by a cable. As the elevator stands moving, the scale reads 450 N.
(a) Find the acceleration of the elevator (magnitude and direction).
(b) What is the acceleration if the scale reads 670 N?
(c) If the scale reads zero, should the student worry? Explain.
(d) What is the tension in the cable in parts (a) and (c)?
A light plane is headed due south with a speed of 190km/h relative to still air. After 1.00 hour, the pilot notices that they have covered only 137km, What is the wind velocity (magnitude)
In astronomy, a parsec ( pc) is dened as the distance at which an object with a size of 1 astro-nomical unit (AU) would subtend an angle of 1 arc-second. Find the conversion factor between parsecs and astronomical units.
a dc circuit has a single battery of voltage v 10.0 v attached to a resistor r 100 ohms. if the voltage is increased
Two 2.00 cm diameter disks spaced 2.239 mm apart from a parallel plate capacitor. The electric field between the disks is 445,140.438 V/m. What was the electron's speed as it left the negative plate
A gasoline engine fuel burns at a temp of 500 degrees Celsius. Its radiator cools to 70 degrees celsius. What is the engines Carnot efficiency
A Styrofoam slab has thickness h and density ?s . When a swimmer of mass m is resting on it, Find the area of the slab
An proton (m = 1.67 ´ 10-27 kg and q = 1.6 ´ 10-19 C) travelling at 2.7 × 105 ms-1 enters a magnetic field of 1.2 T at right angles to the direction of motion of the electron. What is the centripetal force on proton.
According to a reliable report, in 1795 a member of the Turkish embassy in England shot an arrowto a distance of 441m. calcualte what must have been the minimum initial speed of the arrow
An electron of energy 400 eV moves at right angles to a uniform magnetic field along an arc of radius 2.0cm. What is the energy of the second electron
A 60-g ice cube at 0°C is heated until 54 g has become water at 100°C and 6.0 g has become steam at 100°C. How much energy was added to accomplish the transformation
A screen is placed 1.0 meter away from the slits. Initially, you measure the interference pattern from the 2 slits on the screen. You then place the guanine film directly behind one of the slits, Determine the thickness of the guanine film
What is the average force felt by a 0.06 kg tennis ball if it strikes the racket at a speed of 30m/s and leaves the racket with a speed of 50m/s in the opposite direction
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