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The diameter of our disk-shaped galaxy, the Milky Way, is about 1.0 105 lightyears (ly). The distance to Messier 31, which is Andromeda, the spiral galaxy nearest to the Milky Way, is about 2.0 million ly. If a scale model represents the Milky Way and Andromeda galaxies as dinner plates 40 cm in diameter, determine the distance between the centers of the two plates.
A woman on a bridge 88.9 m high sees a raft floating at a constant speed on the river below, Find the speed of the raft
At a factory, a noon whistle is sounding with a frequency of 480-Hz. As a car travelling at 79 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory.
As a person walks, the femur (upper leg bone) slides in a socket in the hip, Find the frictional force on the bone in the hip joint
A spherical hot air baloon is initially filled with air at 118 kPa and 18°C and has an initial diameter of 4 m. What is the rate of change of the balloon's diameter when it reaches the inflated diameter
Two cylindrical bars, each with diameter of 2.30 cm, are welded together end to end. One of the original bars is copper and is 0.350 m long
A 85.1 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. How long does it take the astronaut to reach the ship
A car travelling at 25.0 {rm m/s} runs out of gas while travelling up a 22.0^circ slope. How far will the car go up the hill before it runs out of gas.
On a certain planet, a 10 kg rock has a gravitational potential energy of 1,056 J when it is resting on a cliff 12 m above the surface
Write an equation for a wave with a frequency of 2Hz, a wavelength of 30 m, and an amplitude of 75 cm
A dentist's drill starts from rest. After 2.70 s of constant angular acceleration it turns at a rate of 3.0 104 rev/min, Find the drill's angular acceleration
A startled armadillo leaps upward, rising 0.575 m in the first 0.195 s. What is its initial speed as it leaves the ground
Two equal point charges repel each other with a force of 5.25 N. If they are separated by 4.0 cm, what is the magnitude of each charge
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