4. Far out in space, two rockets (140,000 kg and 170,000 kg) are docked at opposite ends of a rigid 20 m long connecting tunnel of negligible weight to the rockets. Both rockets start their engines of strength F, = 170 kN and F, = 180 kN, respectively. How long does it take for the system to reach 42 rev/min?

4. Far out in space, two rockets (140,000 kg and 170,000 kg) are docked at opposite ends of a rigid 20 m long connecting tunnel of negligible weight to the rockets. Both rockets start their engines of strength F, = 170 kN and F, = 180 kN, respectively. How long does it take for the system to reach 42 rev/min?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

A meteoroid is moving towards a planet. It has mass m = 0.54×109 kg and speed v1 = 4.7×107 m/s at distance R1 = 1.6×107 m from the center of the planet. The radius of the planet is R = 0.78×107 m. The mass of the planet is M = 5.6×1025kg. There is no air around the planet. a)Enter an expression for the total energy E of the meteoroid at R, the surface of the planet, in terms of defined quantities and v, the meteoroid’s speed when it reaches the planet’s surface. Select from the variables below to write your expression. Note that all variables may not be required.α, β, θ, d, g, G, h, m, M, P, R, R1, t, v, v1 b)Enter an expression for v, the meteoroid’s speed at the planet’s surface, in terms of G, M, v1, R1, and R. c)Calculate the value of v in meters per second.
2. A mass is moving on xy plane as shown in the Figure. Find the angular momentum of the mass about the origin. y (0, 70) (- 50, 0) (0,0) v = 100 m/s m = 2 kg
Figure P9.75 shows a 100 g puck revolving at 100 rpm on a 20-cm-radius circle on a frictionless table. A string attached to the puck passes through a hole in the middle of the table. The end of the string below the table is then slowly pulled down until the puck is revolving in a 10-cm-radius circle. How many revolutions per minute does the puck make at this new radius?
q2
Two stars are orbiting around their center of mass as shown below. Find the speed of the stars. 8 R = 4 x 10° km m = 2.00 x 10 30 kg
While placing a compact disc into a CD player, you notice a small chip on its edge. You attempt to play the CD anyway by placing the CD into the player's deck with the chip at ?0=15.2∘θ0=15.2∘ as measured from the +?+x‑axis. The CD begins to rotate with angular acceleration ?=2.31 rad/s2.α=2.31 rad/s2. If the CD has been spinning for ?=3.51 st=3.51 s and the disc has a radius of ?=6.00 cm,r=6.00 cm, what are the ?–?x–y coordinates of the chip after this time, assuming the center of the disc is located at (0.00,0.00)
2. In the thin plate shown below, the material has a mass per unit area of 20 kg/m² (that is, instead of thinking of this as a volume with a thickness, we're just focused on the 2D area of the shape). What is the moment of inertia of this plate around the pivot point, O? 50 mm 400 mm 150 mm 150 mm 400 mm
88. You are in mission control in Florida, supervising a probe on its way to Mars. The most recent report indicates that the probe will soon need to fire a quick burst of its booster rocket to increase its speed by 5.2 m/s. You know that the spent fuel is ejected at a speed vfuel initial speed of the probe before firing, and that 10% of the probe's inertia is currently fuel. Your main worry is whether enough fuel is left for landing maneuvers. 0. CR = 800 m/s – v, where v, is the Vị -
A 1140 kg1140 kg car has just passed a diner. The closest the car came to the diner was ?=24.5 mR=24.5 m, but the car has driven another ?=30.7 mx=30.7 m in the 2.65 s2.65 s elapsed since then. If the car travels at constant speed, what is the current magnitude ?L of the angular momentum of the car about the diner?
4. Find the magnitude of the moment of the 50 kN force about the axis b-b. 50 kN 30 cm b 65° 30 o 11 cm 20 cm b.
A long limp spring is hung from a beam; the spring's bottom is 660 mm above the table. A 0.50 kg cylinder is hooked to the spring's bottom while the spring hangs relaxed. When the cylinder is dropped, it turns around just above the table, where the spring's bottom had been stretched to 10 mm above the table. What is the cylinder's velocity, half-way to the bottom turn-around?
You stand on the seat of a chair and then hop off. (a) During the time you are in flight down to the floor, the Earth moves toward you with what acceleration? Model the Earth as a perfectly solid object. (Assume your mass is 50.0 kg.) 8.1939x10^-23 m/s2 Explain your logic. (b) The Earth moves toward you through what distance? (Assume the seat is 49.5 cm high.) 1.3020x10^-23 m