Physics Final (Repeats) exam with complete answers
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Course
Physics Fl
Institution
Physics Fl
What two variables determine the mechanical advantage of a simple machine
Force, distance
A screwdriver can be used to open a can of paint. In this situation, the screwdriver is being used as a
Lever
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What two variables determine the mechanical advantage of a simple machine correct answersForce,
distance
A screwdriver can be used to open a can of paint. In this situation, the screwdriver is being used as a
correct answersLever
An oar is used to row a boat. The distance between the oar lock and the rowers hand is 104 cm. This
distance is considered correct answersThe effort distance
The distance between the rowers hand and fulcrum is 104 cm. The distance between the fulcrum and
water is 45 cm. What is the mechanical advantage of the oar correct answers2.31
The mechanical advantage of another oar is 3.00. If the resistance force of the water is 35 N, what is the
effort force exerted by the rower? correct answers11.7N
an automotive engineer realizes it will be difficult for drivers to turn a pickup truck with a steering wheel
that has a radius of only 11 cm. what can the engineer to increase the mechanical advantage of the
steering wheel? correct answersIncrease the radius of the steering wheel
If a simple machine in a frictionless environment requires more effort force than a resistance force, then
the mechanical advantage value would be: correct answersLess than one
The mechanical advantage for a pulley system is determined by correct answerscounting the number of
strands holding the resistance force
a 900 N weight is lifted 14 m. using a system of one fixed and two moveable pulleys, find the effort force
and the effort distance for the weight correct answers227 N; 55 m
,A wheelchair ramp is 10 m long and 1.05 m tall. find the force required to push a wheelchair and a
person (combined weight 855 N) up the ramp correct answers92 N
Find the mechanical advange of a jack screw having a pitch of 34 mm and a handle radius of 52 cm
correct answers96
The mechanical advantage of a compound machine is determined by correct answersmultiplying the
mechanical advantage for each simple machine
a pulley system and an inclined plane are being used to slide a crate up a ramp and into a moving truck.
the inclined plane is 6 m long and is 1.5 m high. the pulley system uses 4 supporting strands to force the
crate up the incline. what is the mechanical advantage of this combined machine? correct answers16
In a second class lever, the distance from the effort to the fulcrum is _______ the distance from the
load/resistance to the fulcrum correct answersgreater than
if the pulley system shown below (5 strands) is lifting a 50 kg load, what is the minimum amount of effort
that must be applied to the system correct answers10 kg
If friction is included in a simple machine, the amount of effort required to move a load will be ______
what is calculated using the formulas for simple machines. correct answersgreater than
a TV repairman has to make a delivery of an old and very heavy television. instead of lifting it up 1.0
meter into his truck, the repairman makes a ramp out of a board 4 meters long. he puts the TV on a
wheeled platform and pushes it up the board and into the back of his truck. What is the mechanical
advantage of the ramp? correct answers4
Find the mechanical advantage of a wheel and axle system if the wheel has a radius of 45 cm and the
axle has a radius of 15 cm if the force is put on the axle correct answers.33
the fixed point of rotation on a lever is a correct answersfulcrum
, what is the weight (resistance) you could lift using a first-class lever if you apply 20 N of effort? the effort
arm is 10 meters and the resistance arm is 5 meters correct answers40 N
determine the ideal mechanical advantage of the pulley system shown in the diagram below (7 strands)
correct answers7
scissors are an example of which kind of lever correct answersfirst
which of the following block and tackle systems has the largest mechanical advantage? A: 5N effort, 10 N
load, 2 strands. B: 5N effort, 15N load, 3 strands. C: 5N effort, 20N load, 4 strands correct answersSystem
C has the largest mechanical advantage
A block and tackle machine is used to lift a box that weighs 90 Newtons. How much force do you need to
pull on the rope if the machine has a mechanical advantage of 5? correct answers18 N
an electric food processor uses 250 joules of electrical energy every second. due to friction and other
causes, the energy available to spin the blades to cut food is reduced to 200 joules per second. the
efficiency of the food processor is: correct answers80%
Moment of inertia is the rotational analogue of correct answersmass
a large horizontal disk with a moment of inertia 4000 kg m^2 is rotating on a vertical axis through its
center. the disk is coasting at a rate of .150 rev/s when a 90 kg person jumps on to the disk from an
overhanging tree limb. The person lands and remains at a distance of 3 m from the axis of rotation. what
will be the rate of rotation of the system after the person has landed correct answers.125 rev/s
a certain coin and a wedding ring have exactly the same mass and radius. when placed at the top of the
incline, which object reaches the bottom of the incline first? correct answersthe coin
The rigid body shown in the diagram below consists of a vertical support post and two horizontal
crossbars with spheres attached. the masses of the spheres and the lengths of the crossbars are
indicated in the diagram. the body rotates about a vertical axis along the support post with constant
angular speed w. if the masses of the support post and the crossbars are negligible, what is the ratio of
the angular momentum of the two upper spheres to that of the two lower spheres? correct answers1/8
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