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3.00×10^23 nitrogen molecules collide with a 20.0 cm^2 wall each second. Assume that the molecules all travel with a speed of 380 m/s and strike the wall head on. What is the pressure on the w
A 1 kg block rests against one end of a horizontal spring which is compressed by 10 $cm$. When the spring is released, the spring forces the block to slide across a table top. It stops 41 from wher
A marble is placed at the bottom of an empty culinder. when 35 ml of water is added to the cylinder the water level reaches the 60ml mark. If the density of the marble is 1000kg/m3 what is the mass
Starting at a point 5 cm to the left of the sheet , you travel through the sheet to a final resting 14 cm to the right of the sheet. what is the change in potential (size and sign) in doing this? Dr
In the polarizer/analyzer combination in the figure below, 53.6% of the light intensity falling on the analyzer is absorbed. Determine the angle between the transmission axes of the polarizer and t
A 21.0-kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 80.5 N and is directed at an angle of 30.0° above the horizontal. Determin
The lowest note on a grand piano has a frequency of 27.5Hz . The entire string is 2.00m long and has a mass of 400g . The vibrating section of the string is 1.90m long. What tension is needed to tun
A dentist uses a small mirror with a radius of 44 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 17 mm from the tooth, what is the magnification of the image?
A mass-spring system oscillates with an amplitude of 3.40 cm. If the spring constant is 228 N/m and the mass is 414 g, determine the mechanical energy of the system.
A hand exerciser utilizes a coiled spring. a force of 89.0 N is required to compress the spring by 0.0191 m. Determine the force needed to compress the spring by 0.0508m.
A potter's wheel having a radius 0.55 m and a moment of inertia 14.8 kg·m2 is rotating freely at 52 rev/min. The potter can stop the wheel in 5.0 s by pressing a wet rag against the rim and e
500 J of work are done to compress the gas while, in the same process, 1200 J of heat energy are transferred from the gas to the environment. Afterward, what is the rms speed of the molecules?
Determine the final temperature of the system consisting of the ice, water, and calorimeter. Remember that the ice must first warm to 0°C, melt, and then continue warming as water.
A 310 kg wooden raft floats on a lake. When a 75 kg man stands on the raft, it sinks 3.2 cm deeper into the water. When he steps off, the raft vibrates for a while. What is the frequency of the vibr
A 68 kg woman stands on a very light, rigid board that rests on a bathroom scale at each end. What is the reading on each of the scales?
In level flight the air speed over the top of the wings is 61 m/s, while the air speed beneath the wings is 55 m/s. What is the weight of the plane?
A description of the gestalt revolt and an analysis pf the challenges it made to behaviorism (specifically) and contemporary psychology generally.
Fred strikes a steel train rail with a hammer at a frequency of 0.52 Hz, and Wilma puts her ear to the rail 2.1 km away. How long after the first strike does Wilma hear the sound? What is the time i
Assume that the net horizontal force is due to rolling friction only and take the free-fall acceleration to be g = 9.80 m/s^2. What is the coefficient of friction for the tire under low pressure?
A 58.3 kg pole vaulter running at 10.7 m/s vaults over the bar. The acceleration of gravity is 9.81 m/s2 . If the vaulter's horizontal component of velocity over the bar is 1.1m/s and air resistance
A hollow ball is rolling along a horizontal surface at 2.5 when it encounters an upward incline. If it rolls without slipping what is the maximum height it will reach?
A refrigerator (coefficient of performance = 3.00) does when it freezes 1.50 kg of water at 20.0-degrees C into ice at 0.0-degrees C?
A spherical conductor with a radius of 75.0 cm has an electric field of magnitude 8.4 x 10^5 V/m just outside its surface. What is the electric potential just outside the surface, assuming the poten
You are driving home from school steadily at 98 for 150 . It then begins to rain and you slow to 62 . You arrive home after driving 3 hours and 30 minutes. How far is your hometown from school?