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a sample of helium gas is excited with an electric current which causes the helium to emit electromagnetic radiation
a proton moves with a speed of 0990ca compute its rest energymevb compute its total energygevc compute its kinetic
a stone with a mass of 0800kg is attached to one end of a string 0700m long the string will break if its tension
a 20 centimeter high object is located between a diverging lens with a focal point of 2 centimeter on the left and a
a valuable antique chest made in 1907 by gustav stickley is to be moved into a truck the weight of the chest is 1500 n
10 volts is applied to a resistor 2 amps flow through the resistor determine what is the resistors
a wheel is rotating about an axis that is in the z-direction the angular velocity is 6 rads at t0 increases linearly
brad tries out a weight-loss plan that involves repeatedly lifting a 450-kg barbell from the floor over his head to a
you are working on a project to determine the density of asteroids in order to figure out what minerals they might
elevator-scale reading1 what will the scale read if the elevator moves in free fall in kg2 what will the scale read if
the frequency for an ac source in an rlc circuit is 5 x 102 rads and its half of the resonance frequency the resistance
a mass less rope that passes over a frictionless pulley connects two blocks the mass of the block on the left is 10kg
one solenoid is centered inside another the outer one has a length of 47 centimeter and contains 6800 coils while the
a crane uses a cable to lift and lower an 845 kg mass compute the tension in the cable under the following conditions1
the speaker projects sound uniformly in all directions find at what distance from the speaker would the intensity be
a stereo speaker has a surface area of 0043 m2 the acoustic power output of the speaker is 15 watt compute what is the
if two successive overtones of a vibrating string are 270 hertz and 315 hertz evaluate what the frequency of the
a violin string vibrates at 296 hertz when unfingered find at what frequency will it vibrate if it is fingered one
a certain solar collector can absorb 3000 btu in 87 hr another panel is added and together they collect 81000 btu in 32
a fisherman notices that wave crests pass the bow of his anchored boat every 284 second he measures the distance
in a swimming pool it is observed that the wave speed of ripples along the surface is 087 meter per second obtain the
a heat engine operating at maximum efficiency has an efficiency of 25 percent the temperature of the cold reservoir is
water flows through a horizontal pipe of cross-sectional are 10 cm2 at a pressure of 025 atm the flow rate is 10 ls at
a 380 millimeter wide bolt is viewed with a 910 centimeter focal length lens a normal eye views the image at its near
a pendulum has a period of 07759 seconds on earth at sea level use g 981 ms2 find the change in the period of this