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A single convex lens projects a focused image of an object onto a screen. If the lens is 15 cm from the object and and 36 cm from the screen, what is the focal length of the lens?
two blocks each of mass 3.05 Kg are fastened to teh top of an elevator. A if the elevator has an upward acceleration a = 1.60 m/s^2, What is the maximum acceleration can the elevator have before the upper string breaks
Testing Tennis Balls Tennis balls are tested by being dropped from a height of 2.5m onto a concrete floor. The 57g ball hits the ground, compresses, How fast is the ball moving just before it hits the floor
6 J of work is needed to push an object of mass 2 kg from point A to point B of the frictionless inclined plane, What is the length s of the inclined plane
Suppose that the sound level of a conversation is initially at an angry 72 dB and then drops to a soothing 50 dB. determine the initial and final sound intensities
A traveler first drives 18.8 km east, then 31.8 km southeast, and finally 11.1 km south. Find the traveler's total displacement
The density of charge-carrying electrons in copper is 8.5 × 1028 electrons m?3, its resistivity is 1.72 × 10-8 ?·m, and the drift speed is 2.80 × 10-3 m/s. At what rate must thermal energy be carried off by a cooling medium
Imagine a perfectly elastic collision between to masses. Mass m1 is moving horizontally to the right at v0 towards mass m2. Calculate the recoil angle of m2 and the recoil speed of m2
at what distances from the speaker do you hear a minimum sound intensity.
a 25.0 mH inductor is in an AC-circuit with a 150 V ac-source which operates at 60.0Hz. find the inductive reactance
The outside mirror on the passenger side of a car is convex and has a focal length of -5.4 m. Find the image distance of the truck
If the player hears the sound of the splash 3.19 s later, illustrate what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.
Assume that a 7.0 cm diameter, 120 W light bulb radiates all its energy as a single wavelength of visible light. Estimate the electric field strength at the surface of the bulb
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