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The brightest star in the night skyis Sirius, which is at a distance of 8.30×1016 m.When we look at this star, how far back in time are we seeing it?Express your answer in years.
A railroad freight car of mass 3.24 104 kg collides with a stationary caboose car. Find the mass of the caboose
A playground merry-go-round has radius 2.10 m and moment of inertia 2000 kg · m2 about a vertical axle through its center, How much work did the child do on the merry-go-round
The spacecraft's mass is 291 kg and the thrust (force) of the rocket engines is 59 N. If the speed of the spacecraft should be decreased by 128 m/s, how long the engines should be fired. (Ignore the change in mass as a result of the rocket engines..
A wheel spinning at 25 rev/s is slowed to a stop by a constant acceleration while turning 50rev. What is the magnitude of the constant acceleration
A bullet of mass mb is fired horizontally with speed v1 at a wooden block of mass mw resting on a frictionless table. The bullet hits the block and becomes completely embedded within it. After the bullet has come to rest within the block, the bloc..
A cubic box of volume 4.2 multiplied by 10-2 m3 is filled with air at atmospheric pressure at 20°C. What is the net force on each side of the box
A charged particle of mass m and positive charge q moves in a uniform constant electric and magnetic fields, E pointing in the y direction and B in the z direction, Find the electric force on the particle
A diver has a birthmark of area 2.0 cm^2. When the birthmark is 4.0 meters beneath the surface of the pool, what is the contact force exerted by the water on this birthmark
A simple refracting telescope provides large magnification by employing
Two wheels have the same mass and radius of 4.3 kg and 0.52 m, respectively. Find the net external torque that acts on each wheel
A 1900-kg car hits a parked 2200-kg car at 32 m/s and sticks to it. What is the velocity of the two cars after the collision
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. what is the new acceleration of the box
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