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A 100 g sample of an unknown liquid absorbs 2000 J of heat energy, raising the liquid's temperature from 50 ? C to 70 ? C . What is the speci?c heat capacity of this liquid? No phase change took pla
To reach the end point in the titration a total volume of 14.71mL of base was needed. What is the mass percent of benzoic and gallic acid?
A 55.0 kg person jumps from rest off a 8.0 m high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Determine th
when 230 ml of water is added to a stock solution of 2.5M 420.0 ml Na3PO4. what is the final concentration of Na+?
A railroad car of mass 2.8 104 kg moving at 2.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. (a) W
The density of palladium at 20°C is 12.0 g/mL and at 1550°C the density is 11.0 g/mL. What is the change in volume (in mL) of 4.21 kg Pd in going from 20°C to 1550°C?
Next, the circle is vertical. In the vertical case the maximum tension in the string is 18.0% larger than the tension that exists when the circle is horizontal. Determine the speed of the stone.
A diving board of length 3.00 m is supported at a point 1.00 m from the end, and a diver weighing 520 N stands at the free end. The diving board is of uniform cross section and weighs 250 N. Find t
A 3.6 kg object hangs at one end of a rope that is attached to a support on a railroad boxcar. When the car accelerates to the right, the rope makes an angle of 45 with the vertical The acceleratio
A 0.8 kg stone attached to a string is whirled in a horizontal circle of radius .18 as in the figure below. The string makes an angle of 25° with the vertical. Find the tension in the string.
Friction and air resistance are negligible. What speed does the ball have when the cable makes an angle of 30 degrees with respect to the vertical?
What is the density of a block of unknown material with a mass of 14.72 g if the dimensions are:
The acceleration of gravity is 9.8 m/s2 .Determine the magnitude of the change in the block's kinetic energy.Determine the change in the block's potential energy.Assumed: The frictional force is con
An 87.7-g arrow is fired from a bow whose string exerts an average force of 115 N on the arrow over a distance of 75.0 cm. What is the speed of the arrow as it leaves the bow?
An electric field of 7.80 105 V/m is desired between two parallel plates, each of area 37.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate?
If we completely hydrolyzed 0.18 kg of water in a 8.2 L container at 300 K, what would be the total final pressure of the system in atmospheres?
The first person is initially moving forward with a speed of 2.40 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregar
Earth's atmosphere contains many volatile substances that are present in trace amounts. The following quantities of these trace gases were found in a 1.0 gallon sample of air. Calculate number of mo
A thin 12.7 m long copper rod in a uniform magnetic field has a mass of 68.0 g. When the rod carries a current of 0.291 A, it floats in the magnetic field. What is the field strength of the magneti
Megan's mass is 30 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 2.8 m/s at the bottom of the slide. How much work was done by friction on Megan?
An object weighs 286 N in the air. When tied to a string, connected to a balance, and immersed in water, it weighs 223 N. When it is immersed in oil, it weighs 259 N. (a) Find the density of the obj
If a sample containing 2.10 mL of nitroglycerine (density = 1.592 g/mL) is detonated, how many total moles of gas are produced?
Each cable has a length of = 3.70 . What is the tension in each of the cables? Use 9.80 for the magnitude of the acceleration due to gravity.
A motorboat heads due east at 12.0 m/s across a river that flows toward the south at a speed of 4.1 m/s. What is the angle from the original heading (with counterclockwise positive) of the boat's di
Muriatic acid can usually be purchased at the hardware store as a 20.0% concentration. How many grams of solution would be needed in order to get 12g of HCl ?