Sunspots are only about 2,000 K cooler than the much brighter photosphere
Indicate whether the statement is true or false
TRUE
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Rotational Dynamics: The rotating systems shown in the figure differ only in that the two identical movable masses are positioned a distance r from the axis of rotation (left), or a distance r/2 from the axis of rotation (right). If you release the hanging blocks simultaneously from rest,
A. the block at the left lands first. B. the block at the right lands first. C. both blocks land at the same time.
You do 174 J of work while pulling your sister back on a swing, whose chain is 5.10 m long
You start with the swing hanging vertically and pull it until the chain makes an angle of 32.0° with the vertical with your sister is at rest. What is your sister's mass, assuming negligible friction? A) 22.9 kg B) 19.5 kg C) 26.3 kg D) 28.4 kg
A 15-m rope is pulled taut with a tension of 140 N. It takes 0.545 s for a wave to propagate along the rope. What is the mass of the rope?
A) 1.7 kg B) 2.1 kg C) 2.8 kg D) 5.1 kg E) 3.2 kg
As a car moves forward on a level road at constant velocity, the net force acting on the tires is:
a. greater than the normal force times the coefficient of static friction. b. equal to the normal force times the coefficient of static friction. c. the normal force times the coefficient of kinetic friction. d. zero.