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A sled is pulled with a horizontal force of 20 N along a level trail, and the acceleration is found to be 0.35 m/s2. An extra mass m = 4.2 kg is placed on the sled. If the same force is just barely able to keep the sled moving, what is the coefficient of kinetic friction between the sled and the trail?
What are the magnitude and direction of the resultant vector R , when the parallelogram law is applied to A and B?
An object weighs 277 N in the air. When tied to a string, connected to a balance, and immersed in water, it weighs 221 N. When it is immersed in oil, it weighs 257 N.
A heavy crate is attached to the wall by a light rope. Another rope hangs off the opposite edge of the box. If you slowly increase the force on the free rope by pulling on it in a horizontal direction, which rope will break? Ignore friction and th..
An athlete swims the length L of a pool in a time t1 and makes the return trip to the starting poisition in a time t2. (a) If she is swimming initially in the positive x-direction, determine her average velocities symbolically in (a) the first hal..
A fisherman standing on the edge of a pier hooks a fish on the surface of the water, and reels in the fishing line at a constant 0.50m/s. If the fisherman's fishing rod is a height of 3.0 m above the water, at what speed is the fish moving (horizonta..
How does the solar nebula theory describe the dramatic density difference between the terrestrial and Jovian planets.
Two unequal point charges q1 and q2 are held in place unconnected from each other. A point charge Q is placed somewhere between them at a point where it remains stationary when free. From this observation, we can conclude that q1 and q2 must eithe..
A 60kg boy and a 45 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.3 m/s2, find the magnitude of the acceleration of the boy toward the girl.
with what speed would the arrow leave the bow.
How much kinetic energy is lost in the collision. compute the focal length of the mirror.
The three displacement vectors in the drawing have magnitudes of A = 5.47 m, B = 5.43 m, and C = 3.91 m. Find the resultant ((a) magnitude and (b) directional angle) of the three vectors by means of the component method. Express the directional an..
What impulse Ft should be supplied to bring the ball to rest? If the ball is stopped in 0.03 s, what is the average force of the ball on the catcher's hand.
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