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You are standing in the very center of a deep, flat-bottomed valley, and shout "Hello!" If the speed of sound is 343 m/s, and you hear the second echo "Hello!" at 2.1 seconds after you shout, how wide is the valley?
a 10 kg box is pulled for 3.60 m along a level surface by a rope that makes an angle of 37 degrees above the horizontal. Find the work done by each force on the box
What are the x- and y-components of the electric field at (x, y) = (0 m, +4 m)? (a)Two charges are placed on the x-axis: one is placed at x = 3 m and the other is at x = -3 m.
A 0.260 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. What is the mass of the second ball
A 2.50 syringe has an inner diameter of 4 , a needle inner diameter of 0.24 , and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses syringe to inject medicine into a patient whose blood pressure is 140/100.
To what distance x can a person who weighs 411-N walk on the overhanging part of the plank before it just begins to tip.
A person takes in a breath of 10!C air and holds it until it warms to 37.2!C. The air has an initial volume of 0.73 L, find the work done by the air on the lungs
You apply a potential difference of 4.50 V between the ends of a wire that is 2.50 m in length and 0.654 mm in radius. What is the resistivity of the wire
A projectile of mass 2.06 kg approaches a stationary target body at 7.70 m/s. What is the speed of the target body
The battery of a pocket calculator has a voltage of 4.0 V and devilers a current of 0.17 mA, How much energy does the battery deliver to the calculator circuit
A man wants to swim across a river that is flowing north to south at 5 m/s. He can swim at a speed of 7 m/s.The river is 1/4 of a km wide. find the vector components of the swimming man's net velocity
A merter stick pivoted at its center has a 100gm mass suspended at its 20cm mark. Where should an 80gm mass be placed to produce equilibrium
a man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless frictionless pulley, In each of the four cases, what is the force exerted on the ceiling by the pulley system
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