What compelling evidence links pulsars to neutron stars?
A) Both pulsars and neutron stars can be found in globular star clusters.
B) Pulsars are known to evolve into neutron stars.
C) Only a small, very dense source could rotate that rapidly without flying apart.
D) Pulsars are always found in binary systems with neutron stars.
E) Both pulsars and neutron stars have been discovered near the Sun.
C
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Which of the following claims cannot be proved or disproved by science?
A) The universe is about 2000 years old. B) The universe started out very hot. C) The universe is about 14 billion years old. D) The universe was created by God.
The figure below shows a single lens with two rays of white light incident on it from the left. Sketch the paths of the blue, yellow, and red components of each of these rays to the point where the light from the upper and lower rays would meet
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What will be an ideal response?
A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. An object of mass of 423 g is attached to the free end of the string
With the string vertical and taut, the object is gently released so it can descend doe to the gravitational force exerted on it by Earth. As the object descends, the string unwinds and causes the pulley to rotate, but does not slip on the pulley. What is the speed of the object after it has fallen through 1.25 m? A) 2.00 m/s B) 2.28 m/s C) 1.97 m/s D) 3.94 m/s E) 4.95 m/s
Fluid Flow: Ideal incompressible water is flowing in a drainage channel of rectangular cross-section. At one point, the width of the channel is 12 m, the depth of water is 6.0 m, and the speed of the flow is 2.5 m/s. At a point downstream, the width has narrowed to 9.0 m, and the depth of water is 8.0 m. What is the speed of the flow at the second point?
A. 2.0 m/s B. 2.5 m/s C. 3.0 m/s D. 3.5 m/s E. 4.0 m/s