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- A 1.0 kg rock is thrown upward with an initial speed of 20 m/s. Assuming no air resistance, the net force on the rock, when it reaches its maximum height, is approximately equal to N. Select one or more: O a. 4.9 O b. 20 O c. 50 O d. 0 O e. 9.8You go through a loop in a roller coaster at constant speed. Your acceleration is: A. zero B. straight down C. toward the center D. straight upYou find yourself stranded on the middle of a frozen pond. The surface is so slick you are unable to get any traction. In an effort to save yourself, you take off your boot and throw it toward the west. This results in... A. you staying put. B. you sliding off to the east slower than the boot's speed. C. you sliding off to the east faster than the boot's speed. D. you sliding off to the west faster than the boot's speed. E. you sliding off to the west slower than the boot's speed.
- The two masses shown are at rest, and the pulleys are frictionless. What does the scale read in kilograms? 5 kg 5kg Select one or more: O a. 10 kg O b. 7.1 kg O c. o kg O d. 5 kg Oe. None of these choices.ans. a) 18.8 m/s c) 10.8 m/s c) How fast can the car take a 40-m radius turn when the pavement is icy? b) How fast can the car take a 40-m radius turn when the pavement is wet? a) How fast can a 2000-kg car take a 40-m radius turn when the pavement is dry? is dry, us = .6 when the pavement is wet, and µs = .3 when the pavement is icy. The mass of the car is 5. The coefficient of static friction for a certain kind of pavement and tires is u, = .9 when the pavement25. A new amusement park ride is shown in the diagram. 10 m C The mass of the small car, including its contents, is 400 kg. and the radius of the loop is 10 m. Assume that the track is frictionless and that no mechanism holds the car in contact with the track. (a) In order that the car stay on the track at B, what minimum velocity must it have at that point? (b) From what minimum height, h, must the car start from rest in order to do this? (c) is the mass of the car a factor in determining ? Explain. one over over a light, fric
- Q5 again pleasePlease asap10. If two objects are dropped in an environment without air resistance, what will occur? Both of the objects will fall with constant velocity O The lighter of the two objects will fall faster than the heavier. O The heavier of the two objects will fall faster than the lighter. O The objects will accelerate downward at the same rate.
- 39. A 12 kg book is pushed fror rest to a final velocity of 10 m/s The book travels óm. How much net force was the book pushed with? O 600 N O 1200 N 200 N O 100 N O OUse the letter associated with each of the following FBD's Fnorm Ffrict A. Fgrav Fnorm B. Ffrict Fapp → Farav C. Ffrict D. E. F. G. Fnorm Fgrav Ftens Fair grav Fnorm grav Fapp Ftens Fgrav Fgrav questions #1 through #12: