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When a flower petal is 4.0cm in front of a converging lens, the inverted image is half the height of the petal. What is the focal length of the lens? Please describe work/variables (eg f=focal length etc.)
A submarine dives to a depth of 190 feet in the ocean. What is the force in pounds acting on a hatch that has a area of 3.7 square feet
The amount of heat that an engine discards to the cold reservoir is 2 times the amount of work that it does. Evaluate what is the efficiency of the engine
A 25g object moving to the right at 20 cm/s overtakes andcollides elastically with a 10.0g object moving in the samedirection at 15cm/s. What is the velocity of each object after collision
A pendulum bob of mass m is attached to a massless string of length L. If the bob is released from rest at a horizontal position, What is the tangential acceleration of the bob
A diffraction grating produces an interference pattern on a wall. How many lines per meter does the grating have
A car with a mass 900kg and velocity 12m/s traveling north isapproaching an intersection. another car with a mass 750kg and avelocity of 9m/s traveling west is approaching the sameintersection.
suppose a 30 gram piece of iron is dropped into a container of water and gives off 165 calories in cooling. calculate
A physics student wants to build a spring gun that when aimed horizontally will give a 30.0- g ball an initial acceleration of 'g' by releasing a spring that has been compressed 14.0 cm. What spring constant is necessary? What is the velocity of the ..
Suppose you have a spherical balloon filled with air at room temperature and 1.0 atm pressure; its radius is 18cm. what's the balloon's new radius
two cars, A&B are 400 meters apart. Car A travels due east at 30 meters per second on a collision course w/ car B, How much time elapses before the two cars collide
Find the mechanical energy of a block- spring system having a spring constant of 1.3 N/cm and an oscillation amplitude of 2.4 cm
A long string is moved up and down with simple harmonic motion with a frequency of 46 Hz. The string is 579 m long and has a total mass of 46.3 kg. Determine the velocity of the wave on the string
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