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You have a 77.7-cm-long copper rod with a rectangular cross section of dimensions 5.75 cm by 8.13 cm. You maintain the ends of the rod at 46.1°C and 92.9°C, but otherwise insulate the rod from its environment. Find the heat current* through the rod. The thermal conductivity of copper is 385 W/(m·K).
The position of an object connected to a spring varies with time according to the expression x = (4.8 cm) sin(9.3 ?t). Find the amplitude of the motion
A small remote-control car with a mass of 1.58 moves at a constant speed of = 12.0 in a vertical circle inside a hollow metal cylinder that has a radius of 5.
Two resistors, 48.8 and 60.5?, are connected in parallel. The current through the 60.5-? resistor is 3.72A, What is the total power supplied to the two resistors
In reality, the COP of the heat pump will only be 60 percent of the ideal value. What is the minimum power of the electric motor when the COP is 60 percent of the ideal value
A puck of mass m1 = 63g and radius r1 = 4.30 cm glides across an air table at a speed of = 1.50 m/s. It makes a glancing collision with a second puck of radius r2 = 6.00 cm and mass m2 = 115 g (initially at rest) such that their rims just touch.
An airplane is flying with a velocity of 81.6 m/s at an angle of 18.0 above the horizontal. When the plane is the distance 123 m directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far from t..
What is magnitude of the net force on the student
A ball is thrown from the top of a building upward at an angle of 39degrees to the horizontal and with an initial speed of 24m/s. The ball is thrown at a height of 57 m above the ground and hits the ground 98.55 m from the base of the building. Wh..
Two people, one of mass 88kg and the other of mass 62kg , sit in a rowboat of mass 68kg. With the boat initially at rest, In what direction will the boat move
A runner accelerates to a velocity of 4.15 m/s due west in 1.50s. His average acceleration is 0.640 m/s^2, also directed due west. What was his velocity when he began accelerating.
A 2000-kg horizontal beam is supported at each end. A 160-kg load rests a quarter of the way from one end if the beam and 120 kg cargo is 1/3 from the other end. What is the vertical force on each of the supports.
A water pipe having a 2.9 cm inside diameter carries water into the basement of a house at a speed of 0.87 m/s and a pressure of 174 kPa, What is the speed and water pressure at the second floor
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