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It is desired to project an image of an object four times actual size with a lens of focal length 20 centimeter. Estimate what object distance should be used?
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Question: To take off from the ground, an airplane must reach a sufficiently high speed. The velocity required for the takeoff, the takeoff velocity, depends on several factors, including the weight of the aircraft and t ...
Question: Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass m and radius of orbit L. The satellites fire rockets that provide the force neede ...
Two forced of magnitudes 6.0 N and 8.0 N act on an object. What relationship between the directions gives the smallest magnitude net force and what is this magnitude?
An object moves with constant acceleration 4.45 m/s^2 and over a time interval reaches a final velocity of 10.0 m/s. If its original velocity is 5.00 m/s, what is its displacement during the time interval? What is the di ...
Question: A pendulum has a period of 1.95 s on Earth. What is its period on Mars, where the acceleration of gravity is about 0.37 that on Earth? Express your answer to two significant figures and include the appropriate ...
Question: A rectangular wooden block of weight W floats with exactly one-half of its volume below the waterline. The wooden block is removed from the water bath and placed in an unknown liquid. In this liquid, only one-t ...
Question: The siren of a fire engine that is driving northward at 31.0 m/s emits a sound of frequency 2020 Hz. A truck in front of this fire engine is moving northward at 19.0 m/s. a) What is the frequency of the siren's ...
Question: You are testing a new amusement park roller coaster with an empty car with a mass of 110KG . One part of the track is a vertical loop with a radius of 12.0 METERS . At the bottom of the loop (point A) the car h ...
Question: A simple pendulum oscillates with frequency f. a) what is its frequency if the entire pendulum accelerated 0.43 g upward? b) what is its frequency if the entire pendulum accelerates 0.43 g downwards? The respon ...
Question: A picture frame hung against a wall is suspended by two wires attached to its upper corners Part A: If the two wires make the same angle with the vertical, what must this angle be if the tension in each wire is ...
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