When an astronaut experiences weightlessness in space, their mass is
A. zero.
B. becoming lesser and lesser as s/he is going higher.
C. the same as on Earth.
D. double than on Earth.
Answer: C
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Photography Optics: A 35-mm single lens reflex (SLR) digital camera is using a lens of focal length 35.0 mm to photograph a person who is 1.80 m tall and located 3.60 m from the lens.(a) How far is the CCD sensor from the lens when the person is in focus?(b) How tall is the person's image on the CCD sensor?
What will be an ideal response?
This figure shows a "slice of the universe" from the Sloan Digital Sky Survey. What is the Sloan Great Wall (indicated by the arrow)?
A) a huge collection of galaxies extending a billion light-years in length B) a giant wall of hot gas extending a billion light-years in length C) our cosmological horizon, the point beyond which we cannot see D) a hypothesized structure built of the particles responsible for creating dark energy in the universe
Explain how the essential features of special relativity imply that a beam of light from a fast moving spaceship will always be observed to moving at the speed of light
What will be an ideal response?
Two blocks, A and B, have the same size and shape. Block A floats in water, but block B sinks in water
Which block has the larger buoyant force on it?
1.Block A has the larger buoyant force on it. 2.Block B has the larger buoyant force on it. 3.Neither; they have the same buoyant force on them. 4.Impossible to determine from the given information.