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Andy is moving a 12.7 lbf box on a wooden floor by pushing the box with 2.4 N of force forward and down at an angle 4.4o with respect to the floor. The box is moving with a constant speed of 0.3 m/s. What is the magnitude of the force of friction among the box and the floor?
a 5.0-liter gas tank holds 1.4 moles of helium monatomic and 0.7 moles of oxygen diatomic at a temperature of 260 k.
An airplane is flying in a horizontal circle at a speed of 100 m/s. The 80.0-kg pilot does not want her radial acceleration to exceed 7g. (a) What is the least radius of the circular path? (b) At this radius, what is the force causing the centripe..
Why is surface wind always directed at some angle across sea-level isobars toward lower pressure? Why is the surface wind directed across the sea-level isobars at a greater angle in Madison than over the middle of Lake Michigan.
A skier starts from rest at the top of a hill. The skier coastsdown the hill and up a second hill, as the drawing illustrates. Thecrest of the second hill is circular, with a radius of 31.5 m.Neglect friction and air resistance.
A steam catapult launches an aircraft from the aircraft carrier John C. Stenos, giving it a speed of 180 mi/h in 3.00 second. Find the average acceleration of the aircraft
A radar has a resolving power of 30 m at a range of 1.0km. What is the minimum width of its antenna if its operating frequencyis 9500 MHz
the drawing shows three point charges fixed in place. the charge at the coordinate origin has a value of q1 7.65
There are two blocks connected by a string and tied to a wall, with an angle of 33o. Find what is the tension in the string connecting the two blocks
A block of mass 16.7 kg supported by a vertical massless cable is initially at rest. estimate the magnitude of the net force acting on the mass
A 2.5-m long board with a mass of 12 kg is placed on a bar so that it is perfectly balanced, i.e., A 22-kg child sits on the left end of the board. What is the torque they exert on the system
Assume you operate a 150 Watt lamp continuously for one week when the power utility rate is 8¢/kWh. Determine what would the cost be
One end of a stretched string is moved transversely at constant velocity Vy for a time T, Calculate the kinetic and potential energy energies associated with the pulse
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