1174338500

# 1174338500 - HW Chapter 6 6.8 A loaded grocery cart is...

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HW Chapter 6 6.8 A loaded grocery cart is rolling across a parking lot in a strong wind. You apply a constant force F = (30 N) i – (40 N) j to the cart as it undergoes a displacement s = (-9.0 m) i - (3.0 m) j . How much work does the force you apply do on the grocery cart? 6.14 You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work- energy theorem to find a) its speed just as it left the ground; b) its maximum height. 6.27 Stopping Distance. A car is traveling on a level ground with speed v 0 at the instant when the brakes lock, so that the tires slide rather than roll. a) Use the work-energy theorem to calculate the minimum stopping distance of the car in terms of v 0 , g, and the coefficient of kinetic friction μ k between the tires and the road. b) The car stops in a distance of 91.2 m if v 0 = 80.0 km/h. What is the stopping distance if v 0 = 60.0 km/h? Assume that the value of

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## This note was uploaded on 09/08/2008 for the course PHYS 4A taught by Professor D.v during the Spring '07 term at Evergreen Valley.

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1174338500 - HW Chapter 6 6.8 A loaded grocery cart is...

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