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A box, initially at rest on the ground, is lifted straight upin the air by a rope, moving straight up at constant speed. When it's gotten pretty high off the ground, the rope is released,and the box falls back to the ground. Sketch a graph of the total force acting on the box from the start of that motion to the finish.
The International Space Federation constructs a new spaceship thatcan travel at a speed of 0.995c. Mary boards the spaceship totravel to Barnard's star which is 5.98 ly away. After reachingBarnard's star, the spaceship travels slowly around the st..
Two radio waves are used in the operation of a cellular telephone. To receive a call, the phone detects the wave emitted at one frequency by the transmitting station or base unit. determine the difference between the two frequencies used in the ope..
A solid sphere has a temperature of 768 K. The sphere is melteddown and recast into a cube that has the same emissivity and emitsthe same radiant power as the sphere. What is the cube'stemperature in kelvins?
In a television set, electrons are accelerated from rest through apotential difference of 20 kV. Theelectrons then pass through a 0.29 Tmagnetic field that deflects them to the appropriate spot on the screen.
A hypothetical 40cm long arm is assumed to be weightless. What is the maximum weight that can be held in the hand if the muscle is attached 1 cm from the below
an rlc circuit is used to tune the radio to an fm station broadcasting 99.0 mhz. the resistance in the circuit is 15.0
A potter's wheel having a radius 0.55m and a moment of inertia 12kg•m2 is rotating freely at 51 rev/min. The potter can stop the wheel in 7 s by pressing a wet rag against the rim and exerting a radially inward force of 67N. Find out the effectual co..
In an L-R-C series circuit, the resistance is 420 ohms, the inductance is 0.300 henrys, and the capacitance is 1.20×10?2 microfarads. what maximum voltage amplitude can the source have
A steel ball bearing 7.00mm in diameter is dropped into a cylinder of glycerin. What is the terminal velocity of the ball bearing
The current from an AC source is given by: I(t) = 6.50 sin(84.0 t + 1.090 ) mA, What would the phase shift be in degrees
a 10 atmospheric dump valve adv at a pwr relieves steam at 1100 psia when the enthalpy required to make a pound of
In a certain time period a coil of wire is rotated from oneorientation to another with respect to a uniform 0.38-T magneticfield. The emf emf induced in the coil is4.7 V. Other things being equal, whatwould the induced emf be if the field had a ma..
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