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The forces acting on the arm of a person lifting a dumbbell. The force F is the force puling on the hand due to the weight of the dumbbell, the force W ,arm is the weight of the arm and T is the ten
A soccer ball is kicked with an initial horizontal velocity of 14.0 m/s and an initial vertical velocity of 13.0 m/s. What is the speed of the ball 1.7 seconds after it was kicked?
The transmitted force is no greater than 110% of the static value? What is the minimum frequency that meets this condition above the natural frequency?
A total of 8.77·10^6 electrons are placed on an initially uncharged wire of length 1.87 m. What is the magnitude of the acceleration of a proton placed at a point in space, which is a perpend
Determine the minimum power input needed to drive this escalator. What would this answer be if the escalator velocity were to be doubled.
Approximately what frequency of sound is needed to produce a clear image of a tumor that is 1.00 across if the speed of sound in the tissue is 1550 ?
The response amplitude of the table is no larger than 1 percent of the input, what is the maximum natural frequency for the table system and the resulting individual spring stiffness?
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 16.0 m/s at an angle 27.0 degrees; with respect to the horizonta
A lead wire of cross-sectional area 0.980 mm2 is at a temperature of 2.00 K and carries a current of 0.490 A. (a) Find the voltage drop along a 10.4 m length of the wire.
A cube of ice is taken from the freezer at -8.2C and placed in a 92g aluminum calorimeter filled with 309g of water at room temperature of 20.0 C. The final situation is observed to be all water at
An electric field of intensity 3.27 kN/C is applied along the x-axis. Calculate the electric flux through a rectangular plane 0.350 m wide and 0.700 m long if the following conditions are true. (a)
Two particles with electric charges Q and ?3Q are separated by a distance of 0.8 m. (a) If Q = 2.2 C, what is the electric force between the two particles? magnitude N direction (b) If Q = -2.2 C, h
An electron with kinetic energy E = 3.20 eV is incident on a barrier of width L = 0.110 nm and height U = 10.0 eV. What is the probability that the electron is reflected?
How much energy is required to melt all of the ice? How much energy is required to raise the temperature of the melted ice and water and copper cup to 30 C?
A single mass m1 = 4.0 kg hangs from a spring in a motionless elevator. The spring is extended x = 11.0 cm from its unstretched length. 1) What is the spring constant of the spring?
A helium balloon ride lifts up passengers in a basket. Assume the density of air is 1.28 kg/m3 and the density of helium in the balloon is 0.18 kg/m3.
Find the velocity of the rain with respect to the following reference frames. a) The car ?? b) The earth ??
Consider an infinitely large homogeneous mixture of 235U and a moderating material. Determine the ratio of fuel-to-moderator density that will render this system critical for the following moderator
It engages a spring of stiffness 350 (N/cm) and a damper with a coefficient of 1.75 (N.s/cm) What is the maximum displacement of the piston and how long does it take to reach this point?
(a) What is the multiplication factor of this reactor? (b) What is the conversion ratio?
Neutrons are slowed down to thermal energies in a 1:1 mixture of H2O and uranium (4 atom% 235-U, 96 atom% 238-U). Estimate the probability that a 0.0253 eV neutron will have scattering collision wi
The current in a series circuit is 17.0 A. When an additional 10.0-? resistor is inserted in series, the current drops to 9.4 A. What is the resistance in the original circuit?
Calculate the energy released by fission of 1 g of Uranium-235 in MWd (Mega Watt day), assuming that the energy per fission ofUranium-235is 200 MeV. (1 MWd is the energy generated by a system that
Assume that the mud ends up uniformly distributed over a surface area of the valley measuring 1.2 km x 1.2 km and that the mass of a cubic meter of mud is 1900 kg. What is the mass of the mud sittin
The A-string on a cello vibrates in its first normal mode with a frequency of 220 Hz. The vibrating segment is 65.0 cm long and has a mass of 1.40 g. (a) Find the tension in the string. (N) (b) Det