SAT阅读模拟练习题｜附答案解析（十六）

2023-08-29 10:43:00来源：网络整理

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　　11.The coefficient of static friction between a box and a ramp is 0.5. The ramp’s incline angle is 30.If the box is placed at rest on the ramp, box will

　　A. accelerate down the ramp

　　B. accelerate briefly down the ramp but then slow down and stop

　　C.move with constant velocity down the ramp

　　D.not move

　　E.Cannot be determined from the information given

　　12.A 20N block is being pushed across a horizontal table by an 18N force . If the coefficient of kinetic friction between the block and the table is 0.4. find he acceleration of the block

　　A.0.5 m/s B.1 m/s C.5 m/s D.7.5 m/s E.9m/sC

　　13.A stone is thrown horizontally with an initial speed of 30m/s from a bridge.Find the stone’s total speed when it enters the water 4 seconds later(Ignore air resistance.)

　　A.30m/s B.40m/s C.50m/s D.60m/s E.70m/s

　　14.Which one of the following statements is true concerning the motion of an ideal projectile launched at an angle of 45 to the borizontal?

　　A.The acceleration vector points opposite to the velocity vector on the way up and in the same direction as the velocity vector on the way down

　　B.The speed at the top of the trajectory is zero.

　　C.The object’s total speed remains constant during the entire flight

　　D.The horizontal speed decreases on the way up and increases on the way down

　　E.The vertical speed decreases on the way up and increases on the way down

　　15.Which pair of forces can produce a resultant of 15 newtons?

　　A.20N,20N B.25N,5N C.5N,5N D.7N,7N E.5N,3N

　　16.Two crates are stacked on top of each other on a horizontal floor , crate #1 is on the bottom , and crate #2 is on the top . Both crates have the same mass . Compared with the strength of the force Fnecessary to push only crate #1 at a constant speed across the floor, the strength of the force Fnecessary to push the stack at the same constant speed across the floor is greater than Fbecause

　　A.the force of the floor on crate #1 is greater

　　B.the coefficient of kinetic friction between crate #1 and the floor is greater

　　C.the force of kinetic friction. But not the normal force, on crate #1 is greater

　　D. the coefficient of static friction between crate #1 and the floor is greater

　　E.the weight of crate #1 is greater

　　17.A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between crate and the floor is 0.4, land the coefficient of kinetic friction is 0.3. A force F of magnitude 344N is then applied to the crate,parallel to the floor. Which of the following is true?

　　A.The crate will accelerate across the floor at 0.5m/sB.Thestatic friction force , which is the reaction force to F as guaranteed by Newton’s third law . will also have a magnitude of 344N

　　C.The crate will slide across the floor at a constant speed of 0.5m/s

　　D.The crate will not move

　　E None of the above

　　18.A block of mass m is at rest on a frictionless, horizontal table placed in a laboratory on the surface of the earth . An identical block is at rest on a frictionless, horizontal table placed on the surface of the moon . Let F be the net force necessary to give the earth-hound block an acceleration of a across the table . Given that g is one sixth of g, the force necessary to give the moon-boud block the same acceleration a across the table is

　　A.F/12 B.F/6 C.F/3 D.F E.6F

　　19.As the angle between two concurrent forces increases,the magnitude of their resultant

　　A.increases only B.decreases and then increases

　　C.increases and then decreases D.remains the same E.decreases only

　　20.A girl walks 2 meters north, 4 meters west,and 2 meters south.Her final displacement is

　　A.4 m east B.4m west C.2m north D.2m south E.5m northwest

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