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An astronomer is using a telescope to observe two distant stars. The stars are marginally resolved when she looks at them through a filter that passes green light near 550 nm. Which of the following actions would improve the resolution? Assume that the resolution is not limited by the atmosphere. Select all that apply. using a telescope with an objective lens of the same focal length but a smaller diameter using a telescope with an objective lens of the same diameter but longer focal length using an eyepiece with more magnification using a telescope with an objective lens of the same diameter but shorter focal length using an eyepiece with less magnification using a telescope with an objective lens of the same focal length but a larger diameter changing the filter to a longer wavelength changing the filter to a shorter wavelength.
In a three-slit system, the first minimum occurs at an angular position of 6.00 degrees. Where is the first maximum
A block of metal is placed on a top of a half-sphere made of ice. The block slides on the half-shpere down to a height (h) above the ground, What is the force exerted by the half-sphere on the block
A thick-walled hollow cylinder (inner radius=47 cm, outer radius=66 cm) rolls down a 7° incline. If it starts with a speed of 1.9-m/s, what is its speed after it has travelled 16 m? (m/s).
A 265.0 kg block of ice at 0o C is placed in a large lake. The temperature of the lake is just slightly higher than 0o C, and the ice melts. What is the entropy change of the lake
A playground merry-go-round has a radius of 4.60 m and a moment of inertia of 240 kg*m^2 and turns with negligible friction about a vertical axle through its center. How much work did the child do on the merry-go-round
The electric field due to a charged point object has amagnitude of 25.0 N/C at a distance of0.019 m from the object. At what distance would the potential be tripled
During the late 19th and early 20th centuries, direct observations showed that a glacier in Switzerland flowed forward in the downhill direction while its snout (terminus) was retreating higher up the valley? Which of the following describes these..
A mining lift, with a 80kg cage, should be able to pull up to the surface ten 90kg miners, from a 20m deep well, in 20s. If the gearboxes available have an efficiency of 75%, what should be the power rating of the DC motor used. If the driving gear p..
You have a sample of Xenon in a rectangular container. The gas exerts a total force of 2.03 N perpendicular to one of the container walls
Two satellites are in circular orbits around a planet that has radius 9.00*10^6 m. One satellite has mass 77.0kg , What is the orbital speed of this second satellite
A fuel leak is discovered at this point, and crew calculates that the plane can safely fly no more than 170 km before an emergency landing should be attempted. The only appropriate location for an emergency landing is 100 km north of their current po..
question magnesium metal reacts with hydrochloric acid to form aqueous magnesium chloride and hydrogen gas. an excess
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