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A small leak develops in her propulsion system and 7.79 g of gas are ejected each second into space with a speed of 797 m/s. She notices the leak 5.91 s after it starts. How much will the gas leak h
A fire hose 3.51 cm in diameter is capable of spraying water at a velocity of 24.7 m/s. For a continuous horizontal flow of water, what horizontal force should a fireman exert on the hose to keep it
What is the initial thrust exerted on your spacecraft by the retro-rocket? What is the thrust's direction (positive if in the direction of the velocity of the spacecraft, or negative if in the oppo
The center of mass of a proton with mass 1.673·10-27 kg and alpha particle with mass 6.645·10-27 kg is moving with a speed of 2.235×105 m/s. What is the speed of the proton in the
A fire hose 3.51 cm in diameter is capable of spraying water at a velocity of 24.7 m/s. For a continuous horizontal flow of water, what horizontal force should a fireman exert on the hose to keep i
By making measurements on your own forearm and appropriate approximations and estimations (be sure you describe them) estimate the tension force on the biceps tendon when you hold an object with a m
If the slope is not frictionless, so that the skier has a final velocity of 11.8 m/s , calculate the work done by gravity, the work done by the normal force, the work done by friction, the force of
A pickup truck carries cans of paint in the back bed. The coefficient of static friction between the cans and the bed of the truck is 0.54. There is no back gate to the truck. How long should the
If two masses, m1 and m2, are confined to a circle and identical springs, with spring constant k, connect the masses, find the eigenfrequencies using the T and V matrix. Find the orthogonal and nom
Liquid water at 453 K and 1002 kPa has an internal energy of 762 kJ/kg and a density of 890 kg/m3. (a) What is the enthalpy (per weight and per volume)?
The power per unit area reaching Earth from the sun at the top of the atmosphere at the equator is 1.36 x 10^3 W/m^2, which is called the "solar constant". assuming that the earth radiates like a b
A spherical capacitor is comprised of a solid inner conduction sphere of radius a with positive charge Q and an isolated, concentric, thin outer conduction shell of radius b and charge -Q. Derive th
Using energy methods, find the magnitude and direction of the force on the inner cylinder when it is displaced by a small amount with respect to the outer one. Expain how this force arises.
If a parallel-plate capacitor is disconnected from a battery before the separation between the plates is doubled, what is the ratio of the final stored energy to the initial stored energy?
The Hall-effect is used to determine the mobility of holes in a p-type silicon. Assume the bar resistivity is 20,000 ohm -cm the magnitude of Bz = 0.1 wb / m2, and d = w = 3 mm The measured value of
To a closed system we add 28 kJ of heat while its internal energy decreases by 24 kJ. How much work do we gain or perform? (Everything reversible)
Find the horizontal component of the average force on the ball. Take the x-direction to be positive to the right Express your answer using two significant figures.
The length of the road up the hill is 263 m. What should be the magnitude of F, so that the net work done by all the forces acting on the car is 172 kJ?
A 71.4 skier starts from rest and slides down a 33.0 -m frictionless slope that is inclined at an angle of 18 degrees with the horizontal. Ignore air resistance. a.) Calculate the work done by gravi
A 1.6 kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall. The initial height of the block is 0.56 m ab
Josie and Charlotte push a 12 kg bag of playground sand for a sandbox on a frictionless, horizontal, wet polyvinyl surface with a constant, horizontal force for a distance of 6.00 m, starting from r
Juana slides a crate along the floor of the moving van. The coefficient of kinetic friction between the crate and the van floor uis 0.112.
Neutrons of 1.5 MeV energy are introduced at the rate of 2x10^15 neutrons/cm^3/sec into an infinite slab of graphite. Calculate the number of elastic scattering collisions occurring per second per c
Consider a 10 g sample of enriched uranium (containing initially 15 w/o in U235 and the rest is U238) that is exposed in a thermal reactor to a flux of 10^12 neutrons/cm^2/sec for 1 week and then re
Determine the maximum activity of the cobalt-60 under the given conditions. The thermal-neutron absorption cross-section of cobalt-60 may be taken to be 6 barns.