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Two stars are 5.8 × 1011 m apart and are equally distant from the earth. A telescope has an objective lens with a diameter of 1.45 m and just detects these stars as separate objects. Assume that light of wavelength 600 nm is being observed. Also, assume that diffraction effects, rather than atmospheric turbulence, limit the resolving power of the telescope. Find the maximum distance that these stars could be from the earth.
In one cycle, a heat engine does 310 J of work and releases 620 J of heat to a lower-temperature reservoir. What is the efficiency of the engine
a plucked guitar string produces a sound wave of frequency 0.44 kHz on a day when the speed of sound is 340m/s. What is the wavelength of the sound wave
A photographer uses his camera, whose lens has a 60mm focal length, to focus on an object 2.5m away. How far must the lens move to focus on this second object
Pat (mass 53 kg) and Chris (mass 72 kg) sit in a 26-kg kayak at rest on frictionless water. What's the kayak's speed after Chris catches the pack
A physics teacher tells her class that their final project requires the students to measure a specific variable and determine the velocity of a car with no more than 2.5% error. Will Jennifer and Johnny pass their final project
A 3.00 kg block starts from rest at the top of a 29.0 degree incline and slides 2.00 m down the incline in 1.65 s. Find the frictional force acting on the block
A net force of 7 newtons acts on an object that weighs 49 newtons. What is the resulting acceleration
A circular disk has surface charge density 8.0nC/cm^2. What will the surface charge density be if the radius of the disk is doubled? Express your answer to two significant figures and include the appropriate units.
The fundamental frequency of a closed organ pipe is 264.9 Hz. What is the length of the open pipe
A drug tagged with 9943Tc (half-life = 6.05 h) is prepared for a patient. what is its activity (R) after it has been on the shelf for 2.0 h
When monochromatic light shines perpendicularly on a soap film (n = 1.33) with air on each side, What is the vacuum wavelength of the light in nm
A sonar device makes a soundwave in the air with a frequency of f1 = 61 Hz. What is the frequency of the sound wave created
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