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A car travels due east with a speed of 45.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle
The police officer, knowing that the coefficient of kinetic friction between tires and road is 0.80, calculates the speed of the sports car at impact.
Calculate the resulting pH if 455 mL of 0.200 M HCl is mixed with 315 mL of 0.0850 M Ca(OH)2.
The punter on a football team tries to kick a football so that it stays in the air for a long "hang time". If the ball is kicked with an initial velocity of 25.0 m/s at an angle of 60.0 degrees abov
What is the percentage yield if 465 grams of hydrogen reacted with excess nitrogen and 455 grams of ammonia is formed N2 (g) + 3 H2 (g) 2NH3(g)
Three equal point charges, each with charge 1.85 mu C, are placed at the vertices of an equilateral triangle whose sides are of length 0.250 m. What is the electric potential energy U of the system?
A 25.0-mL sample of 0.150 M butanoic acid is titrated with a 0.150 M NaOH solution. What is the pH before any base is added? The Ka of butanoic acid is 1.5 x 10-5.
You tie a cord to a pail of water, and you swing the pail in a vertical circle of radius 0.600 . What minimum speed must you give the pail at the highest point of the circle if no water is to spill
A 265 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30 degrees with respect to the horizontal. The coefficient of kinetic frictio
If the acceleration is constant, how much time elapses while the auto moves the 180 ft.
What are three obvious sources of error in experiments that use foam cups as calorimeters?
A 42-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 230 J from 440 J. How high does she rise during this
What is the difference between VBT and VSEPR theory?
Calculate the mass in grams of 5.20 moles of ethylene glycol (C2H6O2)
An odorous gas emitted by a hot spring was found to diffuse 2.92 times slower than helium. What is the molar mass of the emitted gas?
Then 25mL of distilled water was added to the beaker and 5 mL of .025 M Fe(NO3)3 solution was also added to make precisely 50 mL(total Volume). What is the molar concentration of the salicylic acid?
A roller coaster car of mass 310 kg (including passengers) travels around a horizontal curve of radius 32 m. Its speed is 16 m/s. What is the magnitude and direction of the total force exerted on th
Two special steps in the experimental procedure are incorporated to reduce the loss of the calcium oxulate precipitate. Identify the steps in the procedure and the reason for each step?
Two ants race across a table 65 cm long. One travels at 4.45 cm/s and the other at 3 cm/s. When the first one crosses the finish line, how far behind is the second one?
Describe at least three possible sources of error in a titration experiment like this and, for each, explain whether the error would result in a calculated molarity that is too high or too low.
A novice skier, starting from rest, slides down a frictionless 36.0 incline whose vertical height is 220m. How fast is she going when she reaches the bottom?
Calculate the value of Kp at each temperature and discuss the results is the decomposition of CO2 an antidote for global warming
The second person, on the opposite side of the lock, pulls at an angle of 45o. With what force should the second person pull so that the net force on the raft is in the forward direction?
What mass of potassium bromide residue remains if 500.0 mL of 0.200 M potassium bromide solution are evaporated to dryness?
A uniform circular plate of radius 2R has a circular hole of radius R cut out of it. the center C' of the smaller circle is a distance .80R from the center C of the larger circle. what is the posit