1. Which of the following gives the magnitude of the buoyantforce? Group of answer choices Newton’s first law of motion Newton’s second law of motion…

  

1.Which of the following gives the magnitude of the buoyant force?Group of answer choicesNewton’s first law of motion Newton’s second law of motion Newton’s third law of motion Archimedes’ principle None of the above  2.When unable to loosen the lug nut on an automobile tire, a mechanic may put a piece of pipe on the end of the handle of the tire iron so as to extend its length. How does that help?Group of answer choicesThe mechanic can apply more force to the tire iron. The extra length means more torque for the same force The mechanic can apply the force more perpendicularly to the tire iron None of the above  3.What is a possible state for an object in the absence of a net force? (Select all which apply)Group of answer choicesat rest constant speed zero acceleration none of the above  4.A child’s toy floats in a swimming pool. The buoyant force exerted on the toy depends on the volume of…. Group of answer choiceswater in the pool the pool the water displaced the toy under water none of the above 5.Determine the net force necessary to give an object with a mass of 3.00 kg an acceleration of 5.00 m/s2. Answer in units of N. 6.A child’s cubic play block has a mass of 120.0 g and sides of 5.00 cm. When placed it is in a bathtub full of water, what fraction of the block will be submerged?(Hint: the density of the water in the bathtub may be assumed to be the same as for fresh water, that is, 1.00 grams/cm3. Note also that if you calculate a number larger than 1 or 100%, this means that the block is sinking and so is 100% submerged.)Group of answer choices0.96 or 96% 0.24 or 24% 0.48 or 48% 1.00 or 100% (e.g. the block sinks) none of the above 7.A comet goes around the Sun in an elliptical orbit. At its farthest point, 600 million miles from the sun, it is traveling with a speed of 15 000 mi/h. How fast is it traveling at its closest approach to the Sun, at a distance of 100 million miles? (Assume that all numbers given are known to at least two significant figures, so this question is not testing you on significant figures.) The speed of the comet at its closest approach to the sun, in mi/hr, will be…Group of answer choices2 500 mi/hr 6 250 mi/hr 15 000 mi/hr 90 000 mi/hr none of the above 8.What is the magnitude of the force of gravity between two 1 000 kg cars which are separated by a distance of 25.0 kilometers on an interstate highway? The force between these two cars will be…. (Hints–you need all distances to be in meters and all masses to be in kg; use Newton’s Law of universal Gravitation. You may assume that the cars’ masses are both known to the nearest kilogram, so your answer should have 3 significant figures.)Group of answer choices40.0 N 2.67 x 10-6 N 1.07 x 10-7 N 1.07 x 10-13 N none of the above 9.A certain object sinks in ethanol, floats in freshwater, and floats in salt water. Which of the following statements is true (choose all which apply)?Group of answer choicesThe object is more dense than salt water The object is more dense than fresh water The object is more dense than ethanol Salt water and fresh water are more dense than ethanol Ethanol would sink if placed in sea water and allowed to settle None of the above  10.According to Newton’s First Law of Motion…Group of answer choicesAll objects which are at rest stay at rest and all objects in motion stay in motion All forces cause a change in an object’s motion An object which is in motion will remain in motion in a straight line at constant speed unless an unbalanced external force acts upon it The force acting on an object is the object’s mass time the gravitational acceleration (F = m g) The natural state of an object is to be at rest Internal forces can change the motion of an object None of the above  11. Which is true of the force pair of Newton’s third law?Group of answer choices.The two forces never produce an acceleration The two forces are in the same direction The two forces act on separate objects The two forces always cancel each other out none of the above   Science Physics SCI 2233

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