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The drawing shows a circus clown who weighs 725 N. The coefficient of static friction between the clown's feet and the ground is 0.51. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force that the clown must exert to yank his feet out from under himself?
To save on heating costs, the owner of a green house keeps 680 kg of water around in barrels. What is the minimum ampere rating of an electric heating system (240 V) that would provide the same heating effect as the water does
Consider two simple pendulums p and q of equal length l and mass m1 and m2 respectively. assume the bobs of the pendulum are connected to each other by a weightless spring of force constant k such that in the equilibrium position,the spring is uns..
An 8000-kg freight car rolls along rails with negligible friction. The car is brought to rest by a combination of two coiled springs.
The distance between the objective and eyepiece lenses in a microscope is 20 cm. The objective lens has a focal length of 5.0 mm. What eyepiece focal length will give the microscope
A disc undergoes 30 revolutions as it accelerates uniformly from rest to 5 rev/sec. What's the angular acceleration of the disk
Suppose you point a pinhole camera at a 15-m-tall tree that is 75m away. If the film is 22cm behind the pinhold, what will be the size of the tree's image on the film
Find the equation for the acceleration of the moving body at any time.
Carbon dioxide gas is heated as it flows steadily through a 2.5-cm-diameter pipe. At the inlet, the pressure is 2 bar, determine the rate of heat transfer to the carbon dioxide, in kW
Two fixed point charges are located along the x axis. A +8.5uC charge is placed at x=+3 cm and a -21uC is placed at x=9.0 cm.
A person running a fever has a body temperature of 39.4 degrees C What is the person's temperature on the Fahrenheit scale
Archimedes purportedly used his principle to verify that the king's crown was pure gold by weighing the crown while it was submerged in water.
A 10 ball of clay traveling east at 9 collides and sticks together with a 40 ball of clay traveling north at 6.5. What is the speed of the ball of clay.
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