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A hypodermic syringe contains a medicine with the density of water. The barrel of the syringe has a cross-sectional area A = 2.60 10-5 m2, and the needle has a cross-sectional area a = 1.00 10-8 m2. In the absence of a force on the plunger, the pressure everywhere is 1 atm. A force F of magnitude 4.00 N acts on the plunger, making the medicine squirt horizontally from the needle. Determine the speed of the medicine as it leaves the needle's tip.m/s
The potential energy of a particle moving in the x-y plane is U=a/(x^2+y^2)^1/2, where a is a constant. What is the force on the particle
Estimate the thickness of the Earth's atmosphere. From your chemistry class, you know that the most common speed of a nitrogen molecule is 640 m/s. What is the altitude
Years ago, a block of ice with a mass of about 19.0 kg was used daily in a home icebox. The temperature of the ice was 0.0°C when it was delivered. how much heat did a block of ice absorb
Find the de Broglie wavelength of an oxygen molecule of average kinetic energy in air at a temperature of 194.0 K
A circuit consists of a battery with a closed circuit, a terminal voltage of 12.0 V, and 1.0-?, 2.5-?, 5.5-?, and 7.0-? resistors connected in series, Calculate the equivalent resistance of the circuit
A certain loudspeaker has a diameter of 45 cm. At what frequency would the wavelength of sound it emits in air be equal to its diameter.
A 4.8-m-diameter merry-go-round is initially turning with a 4.3 s period. It slows down and stops in 16 s. Before slowing, what is the speed of a child on the rim
In the figure, block 2 (mass 1.10 kg) is at rest on a frictionless surface and touching the end of an unstretched spring of spring constant 231 N/m. by what distance is the spring compressed
A child's water pistol shoots water through a 1.0mm -diameter hole. What is the volume flow rate during the squirt
The 14th stage of the 2002 Tour de France was 221 km in length. The last 38 km is a tough, roughly steady, climb up Mount Ventoux and Lance and Richard are vying to win. What was Lance's speed (km/h) over the last 6 km
A 52.6-kg skateboarder starts out with a speed of 2.16 m/s. He does 89.2 J of work on himself by pushing with his feet against the ground. Calculate the change (PEf - PE0) in the gravitational potential energy
It has been proposed to save fuel in air travel by reducing the air speed. How much fuel is saved in a 2000 mile trip
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