The product of force times parallel distance is called ______________
Fill in the blank(s) with correct word
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Buoyancy: A spherical ball of lead (density 11.3 g/cm3) is placed in a tub of mercury (density 13.6 g/cm3). Which answer best describes the result?
A. The lead ball will float with about 83% of its volume above the surface of the mercury. B. The lead ball will float with its top exactly even with the surface of the mercury. C. The lead ball will float with about 17% of its volume above the surface of the mercury. D. The lead will sink to the bottom of the mercury.
Gravitational Force: At their closest approach, Venus and Earth are 4.20 × 1010 m apart. The mass of Venus is 4.87 × 1024 kg, the mass of Earth is 5.97 × 1024 kg, and G = 6.67 × 10-11 N ? m2/kg2. What is the magnitude of the gravitational force exerted by Venus on Earth at that point?
A. 1.10 × 1018 N B. 4.62 × 1028 N C. 5.43 × 1026 N D. 6.30 × 1020 N E. 1.72 × 1019 N
Frank says that if you release the string when swinging a ball in a horizontal circle, the ball flies out in the radial direction defined by the string at the instant you release the ball. John says that it flies out along a tangent line perpendicular to the string, and that it then drops straight down to the ground. Which one, if either, is correct?
a. Frank, because the centrifugal force is no longer counteracted by the string. b. Frank, because balls naturally fly straight out. c. John, because there is no centrifugal force. d. John, because balls fall straight down when released. e. Neither, because although there is no centrifugal force, and the ball's velocity is tangent to the circle at the instant of release, the ball then follows a parabolic trajectory.
What information is needed in order to forecast today's weather?
What will be an ideal response?