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An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 35 cm beyond the first, this second lens having a focal length of 8 cm. If the height of the object is 6 cm, what is the height of the final image ?
A 8.9 dog takes a nap in a canoe and wakes up to find the canoe has drifted out onto the lake but now is stationary. He walks along the length of the canoe at 0.54, relative to the water, and the canoe simultaneously moves in the opposite direction a..
Automobile windshield wipers can be used intermittently during rainfall. what determines the length of the intervals when the wiper is on and when it is off
Three astronauts, propelled by jet backpacks, push and guide a 114 kg asteroid toward a processing dock, exerting the forces, with F1 = 32 N, F2 = 52 N, F3 = 39 N, θ1 = 30°, and θ3 = 60°. What is the (a) magnitude and (b) angle (measured relative ..
A friend speeds by you in her spacecraft at a speed of 0.770 c. It is measured in your frame to be 4.70m long and 1.45m high. What will be its length at rest
How much charge passes during the starter motor
A parallel-plate capacitor has circular plates of 9.27 cm radius and 1.79 mm separation. Calculate the capacitance in picofarads (pF)
From then on, the wheel turns through an angle of 431 rad as it coasts to a stop at constant angular deceleration. Illustrate a t what time does the wheel stop?
A 1500-kW heat engine operates at 25 percent efficiency. The heat energy expelled at the low temperature is absorbed by a stream of water that enters the cooling coils at 20 degrees C. If 60 L flows across the coils per second, determine the incre..
As a result of the friction of tides, the earth rotates more slowly as time progresses. Each year the time it takes for the earth to complete one rotation increases by 20microseconds. at what rate [J/(yr*K)] is entropy being generated due to tidal ..
The treasure map in the figure gives the following directions to the buried treasure, Which direction should you go to reach the treasure and How far should you go to reach the treasure
A 4.6-{\rm Hz} wave with an amplitude of 20cm and a wavelength of 30cm travels along a stretched horizontal string. How far does a given peak on the wave travel in a time interval of 0.55s ? The answer is dpeak = .76m. How would your answer to par..
A 340kg wooden raft floats on a lake. When a 65kg man stands on the raft, it sinks 3.0cm deeper into the water. When he steps off, What is the total energy of vibration
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