10. A child begins to slide down from the top of a frictionless semi circular mound of ice of radius 5m. At what height above the ground will the child loose contact with the ice?
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- Section 7.6 question 154. Suppose a block of mass m slides over a surface with kinetic friction coef- ficient towards a spring with spring constant k. The block reaches the spring with spring with speed vo. (a) How far is the spring compressed at maximum compression? Give your answer in terms of m, k, lk, and vo. (b) What is an expression for the maximum value that v。 could be in order for the spring to remain maximally compressed, no matter what material the block and surface are? Give your answer in terms of m, k, pk. Hint: the coefficient of static friction is always greater than the coefficient of kinetic friction.7. A 20.0 kg box traveling initially at 5.0 m/s slides to a stop on a surface where μ=0.300. Δd = Calculate how far the box travels before coming to a stop (HINT 2a ). Include a FBD.
- 8. The paths of a roller coaster have been provided for different rides. Assuming each of the coasters starts the path from the same initial height, with the same initial velocity, and no friction; compare the speeds of the roller coaster for tracks A - D when they arrive at the horizontal section on dashed line final height at the end of the track (marked with an X). Justify your comparison with basic physics concepts (think about the energy bar graphs) and indicate any assumptions made. Initial H C A Final H pg. 2 of 3Ā C. ETIVATS, JOCES, TO m Completion Status: QUESTION 14 Which of the five graphs correctly shows the potential energy of a spring (spring obeys Hooke's law) as a function of its elongation X? U кк ка IV Ο.Α.Ι OB. II OC. III OD.IV OEV of three particles on which external Cove All Answs2. The motion of an unpowered boat slowing down in calm waters can be modeled using a decaying coefficient of kinetic friction as H(x) = Ho (1-) Xmax In the above expression, x is the distance the boat has traveled, xmax is the total distance the boat travels while stopping, and µo is the initial coefficient of friction. Assuming the boat has a mass of mc, find the total amount of thermal energy generated as the boat comes to a stop.
- A 44-kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is above the bar is 1.5 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar. mBoxing gloves are padded to lessen the force of a blow. a. Calculate the force (in N) exerted by a boxing glove on an opponent's face, if the glove and face compress 6.50 cm during a blow in which the 6.00 kg arm and glove are brought to rest from an initial speed of 10.0 m/s b. Calculate the force (in N) exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (Assume the total mass of the arm remains 6.00 kg.) c. Discuss the magnitude of the force with glove on. Does it seem high enough to cause damage even though it is lower than the force with no glove?13. A car's bumper is designed to withstand a 4.0-km/h (1.12-m/s) collision with an immovable object without damage to the body of the car. The bumper cushions the shock by absorbing the force over a distance. Calculate the magnitude of the average force on a bumper that collapses 0.200 m while bringing a 900-kg car to rest from an initial speed of 1.12 m/s.
- A 41-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.5 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar. mThree identical balls are thrown from the edge of a cliff, each with the same initial speed. Ball 1 is thrown directly upward. Ball 2 is thrown directly downward. Ball 3 is thrown horizontally. Which of the following statements correctly characterizes the relative kinetic energies (K) of the three balls just before hitting the ground. A. K1 = K2 K3 O C. K1 = K2 = K3 D. K1 K2 > K3#69, bottom question...please help!