Calculate the force on a string tied to a ceiling with a 9.0-kg mass attached
88 N
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A star's absolute brightness is calculated at a standard distance of 10 parsecs
a. True b. False Indicate whether the statement is true or false
When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the
A) ball. B) floor. C) need more information
A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2 . The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?
a. 39 cm/s b. 42 cm/s c. 45 cm/s d. 35 cm/s e. 53 cm/s
Whether the universe is open, closed or flat depends on the ____ of the universe
a. luminosity b. density c. temperature d. radius e. rotation rate