How much of the rope must be pulled in
A pulley system has an efficiency of 87.5% how much of the rope must be pulled in if a force of 648N is needed to lift a 150kg desk 2.46m?
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An oil drop carries one excess electron and weighs 9.3 10-15 N. What electric field strength is required to suspend the drop so it is motionless?
A recent ordinance was passed to reduce the allowed sound intensity level of the much despised leaf blowers from their current level of 95 dB to 70.0 dB. Under the new law what is the ratio of the allowed to the previously allowed intensity?.
A car traveling in a straight line has a velocity of 5.67 m/s at some instant. After 7.37 s, its velocity is 8.04 m/s. What is its average acceleration in this time interval?
A 0.25 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 24° with the horizontal. Determine the speed of the stone.
A 60.0 kg crate rests on a level floor at a shipping dock. the coefficients of static and kinetic friction are 0.760 and 0.410, respectively. what horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate acro
An ocean liner leaves New York City and travels 16.1 ° north of east for 233 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the directions (a) due
Vector A is 7.0 cm long and points along the negative x axis. Vector b is 8.5 cm long and points at +77 to the positive x axis. Determine the x and y components of both vectors
Two charges are placed on the x axis. One of the charges q1= +8.5 C is at x1 = + 3.0 cm and the other q2= -21C is at x1 = +9. 0 cm. Find the net electric field (magnitude and direction) at
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Choose one of the theories that fall under the broad theory of cognitivism. Explain some of the major theoretical assumptions
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