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Two identical twins A and B are each 20 year old when B starts on a round trip to a star 10 light years away. If he travels at an average speed of 0.99c, What are the ages of the two twins when B returns?
Two people carry a heavy electric motor by placing it on a light board 2.70m long. One person lifts at one end with a force of 380N, Where is its center of gravity located
A gold nucleus contains 197 nucleons packed tightly against each other. A single nucleon (proton or neutron) has a radius of about 1.310-15 m. Calculate the approximate radius of the gold nucleus. (Hint: Remember that the volume of a sphere is (4/..
Find the specific gravity of the wood
there are 2 flat metal plates each of length l and width w. you place a tiny spacer of height 0.700h0 at one end of the
A dog (mass 11.5 kg) sits on a sled (mass 5.1 kg) that is being pushed with a force of 29 N on a flat snowy surface. what is the coefficient of kinetic friction for the sled sliding on the snow
the electric field at point p is zero. does that mean that the electric potential at that point must also be zero? the
the drawing shows an edge-on view of two planar surfaces that intersect and are mutually perpendicular. surface 1 has
As a 1.00 mol sample of a monatomic ideal gas expands adiabatically, the work done on it is -2500 J. Calculate the final pressure and temperature
A copper block is removed from a 310 C oven and dropped into 1.10 kg of water at 20.5 C. What is the mass of the copper block
Two blocks of masses m1=1 kg and m2 =2 kg are connected by a massless cord passing over a massless, frictionless pulley. what are the accelerations of the two masses with respect to the ground
A person pushes a 16.2-kg shopping cart at a constant velocity for a distance of 27.5 m on a flat horizontal surface. She pushes in a direction 32.3 ° below the horizontal. A 35.3-N frictional force opposes the motion of the cart. (a) What is the mag..
a pilot can withstand ten times the acceleration due to gravity 10 gs if he is wearing a special tight-fitting g-suit
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