Most of the planets discovered around other stars have masses comparable to the terrestrial planets in our own solar system
Indicate whether the statement is true or false
FALSE
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An aluminum light pole weighs 4300 N and supports an arm of weight 700 N, with the arm center of gravity at 1.2 m left of the centroidal axis of the pole. A wind force of 1500 N acts to the right at 7.5 m above the base. The pole cross section at the base has an outside diameter of 235 mm and thickness of 20 mm. The maximum compressive stress at the base is approximately:
(A) 16 MPa
(B) 18 MPa
(C) 21 MPa
(D) 24 MPa
A force acting on an object moving along the x axis is given by Fx = (14x - 3.0x2) N where x is in m. How much work is done by this force as the object moves from x = -1 m to x = +2 m?
a. +12 J b. +28 J c. +40 J d. +42 J e. -28 J
A spaceship is moving past you at a speed close to the speed of light. If you could somehow watch the people inside it over a long period of time, what would you conclude?
A) They are aging more slowly than you. B) They are aging more rapidly than you. C) Their mechanical clocks go slower than yours, but the people are aging at the same rate as you. D) Their time is the same as your time.
If you lift a 35-N weight vertically 50 m above the ground, you are
a. doing work against gravity. b. doing work against friction. c. doing work against inertia. d. doing none of these.