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A 40%-efficient electric power plant produces 900 of electric power and discharges waste heat into 20C ocean water. Suppose the waste heat could be used to heat homes during the winter instead of b
The drawing shows an A-shaped stepladder. Both sides of the ladder are equal in length. This ladder is standing on a frictionless horizontal surface, and only the crossbar (which has a negligible m
A calorimeter contains 27.0 mL of water at 13.5 degrees C. Calculate the enthalpy change, ^H , for this reaction per mole of X .
How long, in seconds, does it take an automobile traveling 65.0 km/h to become even with a car that is traveling in another lane at 40.0 km/h if the cars' front bumpers are initially 114 m apart?
Assuming that the container is completely full, that the temperature is 26.6°C, and that the atmospheric pressure is 1.0atm , calculate the percent (by volume) of air that would be displaced if all
A ski starts from rest and slides down a 24{rm ^circ} incline 75 {rm m} long. If the coefficient of friction is 0.095, what is the ski's speed at the base of the incline?
A rock of mass 34 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 248 N. What is the magnitude
What is the magnitude of the apparent weight of a 79 kg astronaut 5100 km from the center of the Earth's Moon in a space vehicle moving at constant velocity?
Calculate how many cm^3 of a solution of sulfuric acid 80.0% (density = 1.727 g/mL) must be diluted with water in order to prepare a solution of 0.2 L 0.4 M. What's the pH of this solution if we add
A solution is made by mixing 89 g of n-propyl choride (C3H7Cl) and 79 g of n-propyl bromide (C3H7Br). Assume the solution is ideal. What is the total vapor pressure of the solution at 25C?
When the block is pulled out to x = +5.0 cm, we must apply a force of magnitude 360 N to hold it there. We pull the block to x = 13.0 cm and then release it. How much work does the spring do on the
A baseball is thrown at an angle of 24? relative to the ground at a speed of 25.2 m/s. The ball is caught 48.1067 m from the thrower. The acceleration due to gravity is 9.81 m/s2 . How long is it in
Chlorine gas can be produced commercially by passing an electric current through a concentrated solution of sodium chloride (brine). How much H2 can be produced?
if the molality of a NaBr(aq) solution is 2.50 m what is the weight percent of NaBr? the molar mass of NaBr is 102.9 g/mol
The benzene recovered in this stream represents 96 wt% of the B in the feed to this column. Calculate the molar flow rates (Kg/min) and component mass fractions in each product stream both columns.
An electric drill starts from rest and rotates with a constant angular acceleration. After the drill has rotated through a certain angle, the magnitude of the centripetal acceleration of a point on
The men's world record for swimming 1500.0 m in a long course pool (as of 2007) is 14 min 34.56 s. At this rate, how many seconds would it take to swim 0.850 miles? (1 mi = 1609 m.)
Specify whether the acceleration indicates an increasing or decreasing angular velocity.
A 4.30 g nugget of pure gold absorbed 271 J of heat. What was the final temperature of the gold if the initial temperature was 21.0°C? The specific heat of gold is 0.129 J/(g·°C).
Two people start at the same place and walk around a circular lake in opposite directions. One walks with an angular speed of 1.50 10-3 rad/s, while the other has an angular speed of 3.90 10-3 rad/
Two tiny conducting spheres with a mass of 15 gm each are hanging from non-conducting threads of length 70 cm such that they are 4 cm apart as shown to the left. What is the electrical force between
A steel ball bearing is 7 cm in diameter at 25C. A bronze plate has a hole that is 6.997 cm in diameter at 25C. What common temperature must they have in order for the ball to just squeeze throug
A mechanic pushes a 2.8X10^3kg car from rest to a speed of v, doing 4600 J of work in the process. During this time, the car moves 20.0 m. Neglecting friction between car and road, find each of the
What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20.0^circC? Assume that the air bubble is always in thermal equilibrium with the surrounding
The moment of inertia of the student plus stool is 3.0 kg·m2 and is assumed to be constant. The student then pulls the objects horizontally to 0.50 m from the rotation axis. Find the n