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At a maximum level of loudness, the power output of a 75-piece orchestra radiated as sound is 67.8 W. What is the intensity of these sound waves to a listener who is sitting 28.4 m from the orchestra?
A hot-air balloon is rising straight up with a speed of 2.0 m/s. What is the magnitude of forces with the length of the force vectors.
The direction of P is parallel to the axis of the platform, and the magnitude of Pis equal to maω/4. Find the resulting values of the processional rate Ω, the wobble rate φ, and the
Discuss the advantages and disadvantages of nuclear physics. Do you know anything about nuclear waste from nuclear power plants and their disposals mechanism? Discuss the application of half-life.
A block with mass m = 5.3 kg is attached to two springs with spring constants kleft = 33.0 N/m and kright = 49.0 N/m. The block is pulled a distance x = 0.27 m to the left of its equilibrium positi
The kinetic energy of the ball is 46.5 J. What are the vertical and horizontal components of the ball's momentum immediately after striking the crossbar?
Two astronauts, each having a mass of 75.0 kg, are connected by 10.0-m rope of negligible mass. They are isolated in space, moving in circles around the point halfway between them at a speed of 5.00
A 1200 W hair dryer is operated on a 120 V circuit for 5 minutes every day. If electricity costs $0.15/kWh: a) What is the cost of operating the blow dryer for 1 day?
If the ball is in contact with the wall for 3.50 ms, what is the average acceleration of the ball during this time interval?
If you are in an automobile accident with an initial speed of 114 and are stopped by an airbag that inflates from the dashboard, over what distance must the airbag stop you for you to survive the c
A dentist's drill starts from rest. After 3.10 s of constant angular acceleration it turns at a rate of 2.9 x 10 to the 4th rev/min. Find the drill's angular acceleration.
A 3kg block sits at the top of a frictionless ramp that has the height of 6.4 meters. The weight of the block is 29.4 newtons. What is the initial gravitational potential energy of the block?
Assuming that the moon is much less massive than the planet, explain how you can determine the mass of the planet.
A hunter wishes to cross a river that is 2.5 km wide and that flows with a speed of 4.8 km/h. The hunter uses a small powerboat that moves at a maximum speed of 11.2 km/h with respect to the water.
They undergo a head-on elastic collision and each rebounds along the same line as it approached. Find the final speeds of the particles.
A doubly charged ion with velocity 6.8 x 10^+6 m/s moves in a path of radius 34 cm in a magnetic field of 0.9 T in a mass spectrometer. What is the mass of this ion?
The index of refraction for red light in water is 1.331 and that for blue light is 1.340. If a ray of white light enters the water at an angle of incidence of 61.05°, what are the underwater an
A child exerts a tangential 40.8 {N} force on the rim of a disk-shaped merry-go-round with a radius of 2.30 {m}.If the merry-go-round starts at rest and acquires an angular speed of 0.0830 {rev/s}
A beam of electrons is accelerated through a potential difference of 11kV before entering a velocity selector. If the B-field of the velocity selector is perpendicular to the velocity and has a val
The large piston is raised 1 cm. If the small piston is pushed down with a force of 100 N, how much force is the large piston capable of exerting?
A step-up transformer has 270 turns on its primary coil and 90,000 turns on its secondary coil. The EMF of the generator to which the primary circuit is attached is 60.0 V.
When kicked, the ball leaves the ground with a velocity of 21.1 m/s at an angle of 55.0° to the horizontal. By how much does the ball clear or fall short of clearing the crossbar?
To stretch a relaxed biceps muscle 2.2 cm requires a force of 25 N. Find the Young's modulus for the muscle tissue, assuming it to be a uniform cylinder of length 0.24 m and cross-sectional area 52
A vertical straight wire carrying an upward 14 A current exerts an attractive force per unit length of 7.6x10^-4 N/m on a second parallel wire 6 cm away. What current magnitude flows in the second