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A certain LCD projector contains a single thin lens. An object23.5mm high is to be projected so that its image fills a screen1.87m high. The object-to-screen distance is3.05m.
(a) Determine the focal length of the projection lens.(b) How far from the object should the lens of the projector be placed in order to form the image on the screen?
An object is accelerated by a force. If the acceleration increases by a factor 2 and the mass increases by a factor 4, by what factor was the force increased
A playground is on the flat roof of a city school, 4.6 m above the street below (see figure). The vertical wall of the building is h = 6.10 m high, forming a 1.5-m-high railing around the playground. Find the vertical distance by which the ball cle..
Dan is gliding on his skateboard at 3.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground
cylinder made of red brass (K = 130 W/m degrees C) supports a hot reservoir at a temperature of 64o Celsius. Find the rate of heat flow through the cylinder
A large gate weighing 225 N is supported by hinges at the top and bottom of the wooden frame, and is further supported by a wire. (Assume the positive x-direction is to the right and the y-direction is upward.)
A steel beam is placed vertically in the basement of a building to keep the floor above from sagging. Find the vertical compression of the beam
a certain light bulb is rated at 60 w when operating at the rms voltage of 120 va. what is the peak voltage applied
A 2.00 kg mass is connected to a spring with a spring constant of 6.00 N/m. What is the maximum velocity the simple harmonic motion
If we can treat the atom as a 'box' of size 20 nm for an electron, what wavelengths could this electron have
To estimate the muzzle speed of a blow dart, fire dart straight up into the air and time how long it takes to come back down. Roughly half of that time is the time for object to decelerate from its initial velocity to motionless. Estimation the in..
ultraviolet light with a frequency of 3.0x10^15 Hz strikes a metal surface and ejects electrons that have a maximum kinetic energy of 7.43 ev. what is the work function of the metal
A quarterback makes a pass, throwing the ball at 22 m/s and an angle of 63° above the horizontal. What is the maximum height of the ball in flight
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