Briefly describe what you would see if your friend plunged into a black hole. Assume you are watching from orbit of the black hole and have a telescope powerful enough so that you can see him clearly as he falls.
What will be an ideal response?
As he approached the black hole, he would be stretched by tidal forces, his time would run slow, and light coming from him would be redshifted. The closer he got to the event horizon, the slower time would run. You would never see him cross the event horizon, but he would disappear from view when his light became redshifted out of the range of detection.
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To determine boundary-layer characteristics on a body, we must first know the potential-flow solution. The information used from the potential-flow solution is:
(A) The lift and drag acting on the body (B) The pressure and velocity at the boundary of the body (C) The shearing stress acting on the boundary of the body (D) The normal and shearing stress acting on the boundary of the body
Which of the following is not a possible thermometric property of a body?
a. The change in length of a solid. b. The change in volume of a gas at constant pressure. c. The change in pressure of a gas at constant volume. d. The change in weight at constant pressure and volume. e. The change in electrical resistance of a conductor.
Which of the following choices is not a way by which we can study the inside of the Sun?
A) We can send a space probe into the Sun's photosphere. B) We can probe the interior of the Sun by studying the vibrations in its photosphere. C) We can make a computer model of the Sun's interior that allow us to predict the observable properties of the Sun. D) We can study solar neutrinos.
A spherical mirror has a radius of curvature of 22 cm. If the mirror is concave, its focal length is
A) -11 cm. B) -22 cm. C) 11 cm. D) -44 cm. E) 22 cm.