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Q. A pulley system has an efficiency of 87.5 percent. How much of the rope must be pulled in if a force of 648 N is is needed to lfit a 150 kg desk 2.46 m ?
Q. A particle moves along the x axis under the influence of a variable force F(x) = 6.6x2 + 3.3x where the force is measured in Newtons and the distance in meters. What is the potential energy associated with this force at x = 4.0 ? Assume that U(x) = 0 at x = 0 .
A certain freely falling object requires 1.55 s to travel the last 36m before it hits the ground. From what height above the ground did it fall.
Calculate the minimum angle above the horizontal at which Hiawatha must aim in order to outrun the arrow.
Yusef pushes a chair of mass = 51.0 across a carpeted floor with a force (the subscript 'p' here is lowercase and throughout the question) of magnitude = 170 directed at = 35.0 below the horizontal. The magnitude of the frictional force between the c..
The distance between a loudspeaker and the left ear of a listener is 1.60 m. compute the time required for sound to travel this distance if the air temperature is 20° C.
Use approximate calculations assuming constant current during the output pulse. Calculate the ampere-hour rating of the battery so it lasts for five years.
Two identical piano wires have a fundamental frequency of 640 Hz when kept under the same tension. What fractional increase in the tension of one wire would lead to the occurrence of 10 beats/s when both wires oscillate simultaneously.
What average force athletes legs apply on a ground
Both teenagers pull with a force of 55 at an angle of 35 relative to the forward direction, that is the direction of motion. In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magn..
Calculae the flow rate ( in grams per second) of blood in the aorta if the flow speed is 42 cm/s.
Estimate the terminal speed of a wooden sphere (density 0.810 g/cm3) falling through air, if its radius is 8.00 cm and its drag coefficient is 0.500. (The density of air is 1.20 kg/m3.)
Suppose a ping-pong ball and a bowling ball are rolling toward you with the same momentum, and you exert the same average force in stopping each of them.
Determine the tension in each cable if boat has a mass of 490 kg and the angle of each cable is 50 degrees from the horizontal and the boat is being momentarily held at rest. Evaluate this to the tension when the boat is raised and held at rest so th..
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