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A 20.0kg sled is being pulled across a horizontal surface at a constant velocity The pulling force has a magnitude of 80.0N and is directed at an angle of 30° above the horizontal. Determine the coefficient of kinetic friction. Round to two decimal places.
In this lab, you will be rotating a mass on one side of a string that is balanced by a second mass on the other end of the string (Figure 6).
A thin uniform 15 kg post, 1.75 m long is held vertically using a cable and is attached to a 5kg mass and a pivot at its bottom end. Find the angular acceleration of the post about the pivot just after the cable breaks
Blood circulating from the heart to the hands and back to the heart travels a distance of about 1.9 m in 42 s. Find the average speed of the blood
A spacecraft passes earth moving eastward at the speed of a particle whose kinetic energy is 13.5 times its rest energy. Find the speed of the particle
A significant gust of wind displaces the wrecking ball by a small amount, and then the gust is nearly gone. What is the kinetic energy of the ball at the bottom of the swing if the ball is displaced to a maximum of about 0.5o due to the single gus..
One cosmic-ray particle approaches the earth along its axis with a velocity 0.80c toward the North Pole, and another with a velocity 0.60c toward the South Pole. What is the relative speed of approach of one particle with respect to the other? (Hi..
Two small nonconducting spheres have a total charge of 94.1?C. When placed 1.07 m apart, the force each exerts on the other is 10.5 N and is repulsive. What is the (larger) charge on the spheres? What is the (smaller) charge on the other sphere? What..
A football is kicked straight up into the air; it hits the ground 5.4 s later. What was the greatest height reached with the ball? Suppose it is kicked from ground level. With what speed did it leave the kicker's foot?
A polytropic process for an ideal gas in one in which pressure and volume are related by = const., where n is a constant. It is a generalization of the special processes considered earlier. Thus n = 0 defines an isobaric process, n = cp/cv an adia..
a partice moves along the path y=-0.090x^6(-7)meters with a constant speed of 4 m/s. assume dx/dt>_0. Determine the cartisian components of velocity and acceleration at x= - 2m
What is the resultant vector, R, obtained by adding vectors C and D? Express the magnitude to three significant figures. Express the angle to one decimal place.
In a head-on collision, a car stops in 0.29 {s} from the speed of 28 {m/s}. The driver has a mass of 78 {kg}, and is, fortunately, tightly strapped into his seat. what force is applied to driver during that fraction of a second.
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