A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is NaN N. The buoyant force has a magnitude of NaN N and acts vertically upward
An external force acting on the ball maintains it in a state of rest. The external force, including direction, is closest to: A) NaN N, downward
B) NaN N, upward
C) NaN N, upward
D) NaN N, upward
E) NaN N, downward
A
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Explain the difference between a star cluster and a stellar association
What will be an ideal response?
Our best stellar parallax measurements to date come from
A) observations made by astronauts. B) radio interferometry. C) the Keck telescope. D) the Hipparcos satellite. E) ground based measurements taken six months apart.
If the maximum possible accuracy in measuring the velocity of a particle increases, the maximum possible accuracy in measuring its position will
A) increase. B) decrease. C) not be affected.
The basic function of a carburetor of an automobile is to atomize the gasoline and mix it with air to promote rapid combustion. As an example, assume that 30 cm3 of gasoline is atomized into N spherical droplets, each with a radius of 2.0 × 10^?5 m. What is the total surface area of these N spherical droplets?