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How long does it take a 750-W coffeepot to bring to a boil 0.75 L of water initially at 8.0°C? Assume that the part of the pot which is heated with the water is made of 360 g of aluminum, and that no water boils away. The specific heat for aluminum is 900 J/(kg·Co)
The student also measured the length of the object to be (0.126 ± 0.005) m and the mass to be object to be (1.66 ± 0.05) kg. Using the method from this week's lab, determine (c) the density and (d) the proportion of error in the density calculatio..
The rechargable battries for a labtop computer needs a smaller voltage than what a wall socket provides. Therefore a transformer is pluged into the wall socket and produces the necessary voltage for changing the batteries.
Two positive charges, each of magnitude 1 10-6 C, are located a distance of 14 cm from each other. obtain the magnitude of the force exerted on each charge
A cameraman on a pickup truck is traveling westward at19 km/h while he videotapes a cheetah that is moving westward 24 km/h faster than the truck. Find its acceleration from the perspective of the cameraman
What is the magnitude of the electric field at point P? What is the polar direction (angle) of the field at point P, in degrees?
A 461.1N child and a 114N child sit on either end of a 2.9m long seesaw. suppose a 280N child sits .196m from the 461.4N child. how far from the pivot must a 218N child sit to maintain rotational equilibrium?
Why do we write F=Gm1m2/d2 for the gravitational force on an object when it is far from the Earth but F=mg for the gravitational force on it when it is near the Earth's surface?
An ideal gas, Cp = (7/2)R, is heated in a steady-flow heat exchanger from 70°C to 190°C by another stream of the same ideal gas which enters at 320°C. The flow rates of the two streams are the same, and heat losses from the exchanger are negligibl..
a long straight wire carries a current of 46 a. an electron traveling at 1.0 x 107 ms is 6.0 cm from the wire. what is
A 1.50*10^3-kg car starts from rest and accelerates uniformly to 19.1 m/s in 12.0 s. Find the instantaneous power output of the engine at t = 12.0 s, just before the car stops accelerating
One end of a nylon rope is tied to a stationary support at the top of a vertical mine shaft of depth 83.0 m. What is the wave speed at the top of the rope
A spherical balloon has a radius of 7.35 m and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 930 kg? Neglect the buoyant force on the cargo volume itself?
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