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You are a construction worker standing still on 12th Ave N in Fargo, and you watch a minivan drive past at 25 mi/hr eastward. A kid in the back throws a ball at his brother in the front seat at 7 mi/hr.
A. How fast does the ball move, as observed by you? (Positive indicates east, negative indicates west.)
B. How fast does the ball move, according to the kid who threw it?
C. if instead the kid in the front seat throws a rock at the kid in the back seat at 7 mi/hr, how fast would you observe the rock to travel?
Explain how the process of "doping" a semi conductor can improve its overall efficiency. Why does "doping" require a clean room infrastructure
A uniform solid disk with a mass of 23.8 kg and a radius of 0.712 m is free to rotate about a frictionless axle. Forces of 92.0 and 124 N are applied to the disk. Taking the clockwise direction to be the negative direction, what is (a) net torque pro..
A movie camera with a (single) lens of focal length 70 mm takes a picture of a person standing 24 m away. what is the height of the image in millimeters on the film
Four point charges have the same magnitude of 2.4 X 10^-12 C and are fixed to the corners of a square that is 4.0 cm on a side. Determine the magnitude of the net electric field
How much work does the electric field do in moving a -7.7 microCoulomb charge from ground to a point whose potential is +positive 55V higher.
An oscillating block-spring system has a mechanical energy of 1.00 J, an amplitude of 10.0 cm, and a maximum speed of 1.20 m/s. find the mass of the block, and the frequency of oscillation
Consider an airplane window (area 0.34 m2). If the pressure inside the plane is atmospheric pressure and the pressure outside is 18% of Patm, what is the force on the window
A 100 cm long, 1.2 mm diameter steel guitar string must be tightened to a tension of 1700 N by turning the tuning screws. By how much is the string stretched
A technician wearing a circular metal band on his wrist moves his hand into a uniform magnetic field of magnitude 2.2 T in a time of 0.48 s. find the magnitude of the average emf induced in the band
A flask contains helium gas at 11K. The Flask is thermally isolated and the gas is allowed to escape slowly through a narrow tube until the pressure within the flask is 0,98 atm
Nitrogen at 5 X 10^5 Pa and 80 degrees C is on one side of a partition, occupying 1/3 of the volume of a 1.2 m^3 container. find the final pressure and temprature
It is 155cm from your eyes to your toes. You're standing 190cm in front of the tall mirror. How far is it from your eyes to the image of your toes.
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