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A uniform 2.45- kg spinning disk with a radius of 0.253 m is brought to rest by a brake-pad pressed against the side 0.200 m from the rotation axis. The wheel is brought to rest from an angular velocity of 18.7 rad/s in a time of 21.1 s. What frictional force was applied by the brake pad?
A drug prepared for a patient is tagged with 9943Tc which has a half-life of 6.05 h. What is its activity at the time it is injected
A horizontal spring-mass system has low friction, spring stiffness 150 N/m, and mass 0.4 kg. What is the maximum speed during the motion
John who is ice skating eastward collides with Mary who is ice skating northward. What was John's initial speed
Fully stripped (all electrons removed) oxygen (16O) ions are accelerated from rest in a particle accelerator using a total potential difference of 10.0 MV. What is the current of the ion beam, iion, which is the total charge passing per each second
Light from a sodium lamp with a wavelength in a vacuum of 590 nm enters diamond in which the speed of light is 1.24 108 m/s. What is the wavelength of this light in diamond
A typical coal-fired power plant burns 340 metric tons of coal every hour to generate 750MW of electricity. 1 metric ton= 1000 kg. What is the power plant's thermal efficiency
a roller coaster travels 41.1 at an angle of 40 degrees above the horizontal. how far does it move horizontally and
An insulating sphere has a total excess charge Q distributed uniformly throughout the shere. Use Gauss's Law to calculate the electric field inside the sphere at a distance r
1 search the internet for real applications of statistics in the workplace. as a hint type the word statistics
A proton is projected in the positive x direction into a region of uniform electric field Earrowbold = (-5.40 multiplied by 105) i hat bold N/C at t = 0. Determine the time interval over which the proton comes to rest
A rope pulls on the lower block in the figure with a tension force of 20 N. What is the acceleration of the 2.0 kg block
A concave shaving mirror has a focal length of 33 cm. Calculate the image position of a cologne bottle placed in front of the mirror at a distance of 93 cm. how large it is with respect to the object
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