A 30-kg child rides on a circus Ferris wheel that takes her around a vertical circular path with a radius of 20 m every 22 s. What is the magnitude of the resultant force on the child at the highest point on this trajectory?
a. 49 N
b. 0.29 kN
c. 0.34 kN
d. 0.25 kN
e. 0.76 kN
a
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If a barbell weighs 10 pounds on the Moon, what would it weigh on Earth?
A. 30 pounds. Surface gravity on Earth is 3 times that on the Moon. B. 10 pounds. Gravity is the same on Earth and the Moon. C. 60 pounds. Surface gravity on Earth is 6 times that on the Moon. D. 1.67 pounds. Surface gravity on the Moon is 1/6 that on Earth.
Meteor showers are the result of collisions between asteroids
Indicate whether the statement is true or false
The mass of a body on the Moon is _______________ the mass of the same body on Earth
Fill in the blank(s) with correct word
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.