A ball dropped from a spacecraft is revolving around the earth at a height of 120km. What will happen to the ball? a) It will fall down to the earth gradually b) It will go very far in the space c) It will continue to move with the same speed along the original orbit of the spacecraft d) It will move with the same speed, tangentially to the spacecraft
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A ball dropped from a spacecraft is revolving around the earth at a height of 120km. What will happen to the ball?
a) It will fall down to the earth gradually
b) It will go very far in the space
c) It will continue to move with the same speed along the original orbit of the spacecraft
d) It will move with the same speed, tangentially to the spacecraft
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- Ex. 25 A coin kept on a disc has its centre at a distance of 0.25 m from the axis of rotation of the disc. If u = 0.2, find the angular velocity of th disc at which the coin is about to slip off. (g = 9.8 m/s²) %3Dfind the angular speed of revolution of earth required so that the body on its surface at equator would feel no weight (r. 6400km. g -9.8m/s-24) A stone with mass m = 2 g at the end of a massless string is swinging in a circle of radius R = 1.8 m with and angular velocity ω = 11 rad/s. a) Write an expression for the velocity v of the stone. b) Calculate the velocity of the stone, v in m/s. c) In order to travel in a circle, the direction the stones path must constantly be changing (curving inward). This constant change in direction towards the center of the circle is a center pointing acceleration called centripetal acceleration ac. Write an expression for the centripetal acceleration ac of the stone, in terms of the linear velocity. d) Calculate the centripetal acceleration of the stone, ac in m/s².
- A rotating space station is said to create "artificial gravity"—a loosely-defined term used for an acceleration that would be crudely similar to gravity. The outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. If the space station is 210 m in diameter, what angular velocity would produce an "artificial gravity" of 9.80 m/s2 at the rim? ________ rpmAn ice-skater starts to go into a spin, and she moves her arms closer towards her body. Then, she A) starts rotating slowerB) starts rotating fasterC) stops spinningD) rotation rate stays the same 9.) A large wheel rotates at 2 rev/sec. If the radius is 1m, then the linear speed of a point on the edge of the wheel is: A) 3.1 m/s B) 6.3 m/s C) 9.4 m/sD) 13.7 m/s 10.)Which of the following is NOT a unit of angular velocity? A) degrees per hour B) revolutions per day C) periods per secondD) radians per yearIntro Physics I, Homework #7 See Walker Ch. 5, 6.1, 6.3, 7.1-7.2, 13.1 Submit to Google Classroom by 10 P.M., Monday, April 4 Remember to show all work and include units In Newton's late 17th century era, there were relatively accurate estimates, from terrestrial and astronomical observations and experiments, of the distance of the Earth to the Sun (dEs = 150 million 1. kilometers) and the circumference of the Earth (Cp = 40,000 kilometers [the meter was later defined during the late 18th century French revolution in relation to the size of the Earth]). Newton further estimated, likely based on the density of rocks, that the Earth was a solid sphere with a density about 6 times the density of water, which has density of pwater = 1 g/cm³.
- 2) A bicycle wheel is rotating at 18 rad/s. The person is pedaling such that the wheel is accelerating at 4 rad/s^2.How much time elapses until the bike rider is moving at 20 m/s? Assume the bicycle has 27 inches diameter wheels. a) 10.1 s b) 9.3 s c) 58.4 s d) 15.4 s e) 28.9 sQ1: Two planets of the same mass m are acted on only by the gravitational force of one upon the other. If the distance r between the planets is kept constant, what is the angular velocity of the line joining them?