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The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 45-gal (1.00 gal = 3.79 10-3 m3) unit starts with cold water at 11°C and delivers hot water at 53°C. The unit is electric and utilizes a resistance heater (120 V ac, 3.2 O) to heat the water. Assuming that no heat is lost to the environment, determine the recovery time (in hours) of the unit.
Each driver has a mass of 60.00 kg. Including the drivers, the total vehicle masses are 880 kg for the car and 4080 kg for the truck. The collision time is 0.120s. select coordinates such that the truck is initially moving in the positive x direction..
What is the speed of the 2 cars as they move together after the collision.
The resolution of the eye is ultimately limited by pupil diameter. What is the smallest diameter spot an eye can produce on the retina if pupil diameter is 4.45? Assume light with a wavelength of = 600 .
A long wire carrying 140 A is perpendicular to the magnetic field lines of a uniform magnetic field of magnitude 6.5 mT. At what distance from the wire is the net magnetic field equal to zero
A record turntable rotating at 33(1/3)rev/min slows down and stops in 21 s after the motor is turned off. How many revolutions does it make in this time
A convex lens with 19.8 is mounted 40.0 to the left of a concave lens. When an object is placed 31.0 to the left of the convex lens, What is the focal length of the concave lens
A uniform line of charge that is 20.0 cm long has a total charge of -6.00 ?C. What is the electrostatic force on the electron
A cylindrical container filled with water having a cross section 0.04 m^2 is placed on a scale, What is the rise in water surface after the ball is put in the water compared to before
q1. a delivery truck travels 17 blocks south 16 blocks east and 18 blocks north. what is its final displacement from
a 15 m beam is supported (hinged supports) at both ends and is loades with a 50 n weight 4 m from one end and a 100 n weight 8 meters from the same end. what are the forces at the two supports
A perfect negative index lens is used with a single molecule. How long time will it take to form a perfect image of themolecule with the ideal lens, and why?
An 82.5 kg fullback moving east with aspeed of 5.4 m/s is tackled by a87.0 kg opponent running west at3.28 m/s, and the collision is perfectly inelastic. Calculate the decrease in kinetic energy during the collision.
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