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After a package is ejected from the plane, how long will it take for it to reach sea level from the time it is ejected? Assume that the package, like the plane, has an initial velocity of 270 mph i
How much heat energy is needed to raise the temperature of a 50 g sample of aluminum from 32.7 ?C to 98.7 ?C? The speci?c heat of aluminum is 0.897 J/g · K. Answer in units of J
Two loudspeakers are placed at either end of a gymnasium,both pointing towards each other . the sound emmited by the speakers are in phase and are of frequency of 256 Hz . an observer midway between
The mass of mercury needed to fill the tube is found to be 107.5g. Calculate the inner diameter of the tube in centimeters.
With regenerative braking, such as that used in hybrid vehicles, only 70 percent of the kinetic energy is dissipated.) (a) Find the energy dissipated by friction. (b) Find the coefficient of kinetic
How much heat (in kJ) is required to warm 11.0g of ice, initially at -10.0°C, to steam at 112.0°C? The heat capacity of ice is 2.09 J/g⋅°C and that of steam is 2.01 J/g⋅°C.
A 100 kg rocket has a thrust of 32 N that lasts for 2.00 seconds. It is shot straight up on a day with no wind. Find: acceleration of the rocket as the engine fires
A gaseous mixture of rm O_2 and rm N_2 contains 36.8 % nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 485 mmHg?
If the volume of ocean water (5.4 x 10^20) contains 2.4 percent sodium chloride ("salt") by mass and the density of the water is 1.61 g/mL, calculate the total mass of sodium chloride. (1 ton = 2000
The loop, which is hinged at each corner, is pulled as shown until the separation between points A and B is 3.00 m. If this process takes 0.100 s, what is the average current generated in the loop?
At a temperature of 25oC and a pressure of 750 mmHg, 1.50 g of cyanogen occupies 0.714 L. what is the molecular formula of cyanogen.
An athlete at a gymnasium holds a 3.0kg steel ball in his hand. His arm is 70cm long and has a mass of 4.0kg. What is the magnitude of the torque about his shoulder if he holds his arm
A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0 .C,& ; the volume of the gas is 361 mL. To what& ; temperature must the gas be heated to occupy a volume of 492
When one person was talking in a small room, the sound intensity level was 60 dB everywhere within the room. Then, there were 14 people talking in similar manner simultaneously in the room, what wa
A quantity of gas under a pressure of 1.78 atm has a volume of 550 cm square. The pressure is increased 2.50atm while the pressure remains constant what is the new volume?
You are driving to the grocery store at 26 m/s. You are 105 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant a
The moon revolves around the earth, making a complete revolution in 27.3 days. Assume that the orbit is circular and has a radius of 239,000 miles. What is the magnitude of the centripetal accelera
If the density of the center of the sun is 1.40 g/cm3 at a pressure of 1.30 × 109 atm, calculate the temperature. Answer in units of .C
What is the volume of 3.25 moles of a gas at a temperature of 115 K and a pressure of 275 kPa?
An empty gasoline can with dimensions 15 cm by 40 cm by 12.5 cm is attached to a vacuum pump and evacuated. if the atmospheric pressure is 14.7 lb/in^2, what is the total force in pounds on the out
What is the molar mass of a gas if 0.358 g of the gas occupies a volume of 186 mL at 5.00C and 1.10 atm?
A 2.0 x 10^3 car starts from rest at the top of a driveway 5.0 meters long that slopes at 20.0 degrees with the horizontal. If an average force of 4.0 x 10^3 N impedes the motion, what is the speed
For the reaction 2 HCl + Na2CO3 ! 2 NaCl + H2O + CO2 179.2& ; liters of CO2 is collected at STP. How many moles of NaCl are also formed?
Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
The analysis of a hydrocarbon revealed that it was 85.6281% C and 14.3719% H by mass. When 2.55 g of the gas was stored in a 2.5 L flask at 127.276C, it exerted a pressure of 454 Torr. What is the