The latest observations of distant Type I supernovae suggest the universe is slowing down more than we had expected
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
The solar system contains the Sun, eight major bodies called planets, and at least thousands of smaller bodies
Indicate whether the statement is true or false
If a force acts on an object, the impulse will be
A. zero if the speed of the object does not change. B. nonzero in all situations. C. zero if the force is applied perpendicular to the momentum object. D. zero if the force is in the opposite direction of the velocity of the object.
Although electrons do not normally have precise velocities, you can cause an electron to have a (fairly) precise velocity by
A) measuring both its position and velocity at an earlier time. B) measuring its position. C) measuring its frequency. D) measuring its velocity. E) measuring the force it exerts on another electron.