Two children, Ahmed and Jacques, ride on a merry-go-round. Ahmed is at a greater distance from the axis of rotation than Jacques. Which of the following are true statements? (There could be more than one correct choice.)
A) Jacques has a greater angular speed than Ahmed.
B) Jacques and Ahmed have the same angular speed.
C) Jacques has a smaller angular speed than Ahmed.
D) Ahmed has a greater tangential speed than Jacques.
E) Jacques and Ahmed have the same tangential speed.
B, D
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On planet X, the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2. At a depth 5.00 m below the surface, the absolute pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3
(a) What is the atmospheric pressure on planet X? (b) What is the acceleration due to gravity on planet X?
If the speed of light were not absolute, the speed at which light from a star in a binary system came towards the Earth would depends on the star's
A) position and velocity B) distance C) masses D) sizes
A construction worker pushes a wheelbarrow 5.0 m with a horizontal force of 50.0 N. How much work is done by the worker on the wheelbarrow?
a. 10 J b. 1250 J c. 250 J d. 55 J
Observatory construction sites: Consider the factors that go into selecting telescope construction sites
What type of site would you look for to build a large visible-light observatory? Where would you want to build an X-ray telescope? Would these be the same or different, and why?