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a light ra reflects from a mirror hanging vertically on a wall in your bathroom, and the ray strikes a particular point on the opposite wall. The bottom end of the mirror is then tilted slightly away from the wall so that the mirror and angle of 5 degrees with the wall. The spot where the reflected ray hits is found to move upward a distance of 0.25m. what is the length L of the room?
A physician is making an image with ultrasound of initial intensity 2000 W/m^2. What will be the intensity at this depth if the physician changes the frequency to 5.0 MHz
Box moves back and forth on a horizontal frictionless surface between two different springs, as shown in the accompanying figure. The box is initially pressed against the stronger spring, compressing it 4.1cm , and then is released from rest
Two charged plates create a potential difference of 190 V. At a point halfway between the plates an electron is released from rest. What was the initial speed and direction of the proton
A woman holds a tube of lipstick 3.5 cm from a spherical mirror and notices that the image of the tube is upright and one third its normal size. (a) Determine the position of the image. Is it in front of or behind the mirror? (Use a negative number b..
q1. a golf ball with an initial angle of 50deg lands exactly 229 m down the range on a level course.a neglecting air
An ideal transformer has 50 turns in its primary and 400 turns in its secondary. 8.0- ac is connected to the primary. What is the power supplied to the primary
Two very large parallel plates are oppositesly and uniformly charged. if the field between the plates is 1.7 x 10^6 N/C, How dense is the charge in each plate in muC/m^2
A prospector finds a solid rock composed of granite (\rho = 2560 {\rm kg/m^{3}}) and gold, What percentage of the rock is gold by volume
A car traveling 51.9 km/h is 26.2 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.84 s later. How fast is the car traveling at impact
A 1.10m long ramp is inclined at 13 degrees to the horizontal. A solid ball is released from rest at the top of the ramp. Find the ball's speed at the bottom of the ramp
In certain ranges of a piano keyboard, more than one string is tuned to the same note to provide extra loudness. For example, the note at 1.10 102 Hz has two strings at this frequency. If one string slips from its normal tension of 5.90 102 N to 5..
a worker leaves home at 900 am travels 40 km to the office and then returns home at 500 pm. what is the magnitude of
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