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A rocket traveling 1850 m/s away from the Earth at an altitude of 6800 km fires its rockets, which eject gas at a speed of 1100 m/s (relative to the rocket). If the mass of the rocket at this moment is 25000 kg and an acceleration of 1.2 m/s2 is desired, at what rate must the gases be ejected?
A 0.50-kg object is attached to an ideal massless spring of spring constant 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.7 m/s at the equilibrium position.
A passenger in a roller coaster ride experienced weightless when s/he was at the top of the loop. If the loop has radius 16.0 m, what is the linear speed at the top
Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 12.8 cm-3, and their speed is 615 km/s. Find the current density of these protons
A flat, uniform, circular disk (R = 2.25 m, m = 84.0 kg) is initially at rest, but it is free to rotate in the horizontal plane about a vertical, Find the resulting angular velocity of the disk
A 10 m platform diver during his diving can increase his rotation rate from an initial rate of 1.1 rev/s to a maximum of 2.8 rev/s. what is his moment of inertia at his maximum rotation rate
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1230 Hz. The bird-watcher, however, hears a frequency of 1260 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
A 66-N m torque acts on a wheel with a moment of inertia 175 kg m2. If the wheel starts from rest, explain how long will it take the wheel to make one revolution?
A bucket filled with dirt of mass 20 kg is suspended by a rope that hangs over a pulley of mass 30 kg and radius 0.25 m. Everything is initially at rest.
the security alarm on a parked car goes off and produces a frequency of 1220 Hz. The speed of sound is 343 m/s. At what speed are you driving
Speedboat A negotiates a curve whose radius is 124m. Speedboat B negotiates a curve whose radius is 230m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
Find the angular velocity of a centrifuge in which a particle 10 cm from the axis of rotation experiences a radial acceleration of 10^3 times g
A stone is shown at rest on ground. at. The vector shows the weight of the stone. Complete vector diagram showng another tha results in zero net force on the stone. b. What is the conventional name of the vector you have drawn.
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