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1. As far as an astronomer is concerned, a metal referstoA any elementB any element exceptHydrogenC any element exceptHeliumD any element exceptHydrogen and Helium
2. A spiral density wave refers to a region of enhanced density inthe Galaxy which rotates more slowly than the stars and gas.A TrueB False
3. Globular clusters in the halo of the Milky Way appear to havestars that are younger than open clusters in the disk of the MilkyWayA TrueB False
4. Population I and II stars differ in thatA population I starsare metal-poor and younger than population II stars.B population I stars aremetal-poor and older than population II stars.C population I stars aremetal-rich and older than population II stars.D population I stars aremetal-rich and younger than population II stars.
5. Where are the majority of older, metal-poor stars found in theMilky Way galaxy?A In globular clustersin the galactic halo.B Throughout the wholegalaxy.C In the disk and spiralarms.D At the galacticcenter.
6. The center of our Milky Way Galaxy can be observed most easilyat which of the following electromagnetic wavelengths?A Ultravioletradiation.B Infrared and radiowaves.C Visible light.D High-energy gammarays.
Two cars collide at an intersection. Car A, with a mass of 2000 kg , is going from west to east, while car B, of mass 1400 kg , is going from north to south at 13.0 m}/ s. How fast were the enmeshed cars moving just after the collision
A 20.0- projectile is fired at an angle of 60.0 above the horizontal with a speed of 80.0 . At the highest point of its trajectory, the projectile explodes into two fragments with equal mass, one of which falls vertically with zero initial speed.
In a model AC generator, a 505 turn rectangular coil 7.0 cm by 20 cm rotates at 124 rev/min in a uniform magnetic field of 0.56 T. What is the maximum emf induced in the coil
A large aquarium of height 4.19 m is filled with fresh water to adepth of D = 1.60 m. By how much does the total force on that wall increase if the aquarium isnext filled to a depth of D = 4.20 m
A charge of -5 micro-coulombs is placed at x = 0 cm, y = 0 cm. Another charge of -5 micro-coulombs is placed at x = +22 cm, y = -50 cm. When measured counter-clockwise from the x axis, what angle is the electric force vector acting on the charge a..
A small immersion heater can be used in a car to heat a cup of water for coffee or tea. What is its resistance
One of the concrete pillars that supports a house is 2.3 m tall and has a radius of 0.69 m. Find the weight of this pillar in pounds
starting from rest, a basketball rolls from the top to the bottom of a hill, reaching a translational speed of 5.1 m/s. What is the height of the hill
The wave function for a traveling wave on a taut string is (in SIunits) the following equation. y(x, t) = (0.382 m)sin(14πt - 3πx + π/4), What are the speed and direction of travel of the wave
you height of your eyes above the water 1.75 m are standing 2.00 m from the edge of a 2.50 m deep swimming pool. you
A projectile is fired directly upward at such an initial velocity that it reaches half its height of 45 meters. Determine the speed of the projectile at the top of the trajectory
When 165 V is applied across a wire that is 14 m long and has a 0.31 mm radius, Find the resistivity of the wire
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