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A spacecraft moving away from Earth emits a 4484 Hz signal. A scientist on Earth measures thesignal to be 4479 Hz. What is the speed of the spacecraft relative to Earth?
the coefficient of kinetic friction between the table and the block is 0.320. Sand is gradually added to the bucket until the system just begins to move. Compute acceleration of the motion.
Scientific work is currently underway to determine whether weak oscillating magnetic fields can affect human health, determine the maximum emf that can be generated around the perimeter of a cell in this field
The basic concepts in optics.
A violinist places her finger so that the vibrating section of a 1.20 g/m string has a length of 40.0 cm, then she draws her bow across it. A listener nearby in a 20 ^circ {rm C} room hears a note with the wavelength of 30.0 cm. What is the tensio..
A railroad car of mass 2.4 104 kg moving at 4.00 m/s collides and couples with two coupled railroad cars, How much kinetic energy is lost in the collision
a for a square of side 3.00 cm with charges of 8.00 microc at each corner find the electric field at the center of the
A snow mibile is pulling a large sled across a snow-covered field. The weight of the sled is 3560 N. If the coefficient of friction of the sled is 0.12,
In 13.6 s, 220 bullets strike and embed themselves in a wall. What is the average change in momentum per second for the bullets
A small ball is attached to one end of a spring that has an unstrained length of 0.214 m. The spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 2.73 m/s. The spring remains nearly parallel to the gro..
What is the maximum speed of the car (in km/hr) in the similar turn in the rain, when the coefficient of static friction is reduced to 0.720.
A barge has vertical sides and a flat bottom of 320 ft^2 area. when partially filled, the barge is immersed in fresh water to a depth of 2 ft. upon removal of the load the barge rises 16.0 in.
A bucket of mass 1.70kg is whirled in a vertical circle of radius 1.55m . At the lowest point of its motion the tension in the rope supporting the bucket is 21.0N. Find the speed of the bucket
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