The formula for kinetic energy is:

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# The formula for kinetic energy is: - PowerPoint PPT Presentation

Tue Jan 31 Today Review hw 5.5 Read p293-295 (p280) 83,87,91 (p307-9) 56, 61,76,81,82 ch 10-11 test next Tue. or Wed.!. The formula for kinetic energy is:. K=(mv 2 )/2 K=( mv ) 2 /2 K=2mv 2 K=(mg)/h. 0 of 30. The SI units for energy and work are:. Newtons Watts Joules Amperes.

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### Tue Jan 31 Today Reviewhw 5.5 Read p293-295 (p280) 83,87,91 (p307-9) 56, 61,76,81,82ch 10-11 test next Tue. or Wed.!

The formula for kinetic energy is:
• K=(mv2)/2
• K=(mv)2/2
• K=2mv2
• K=(mg)/h

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The SI units for energy and work are:
• Newtons
• Watts
• Joules
• Amperes

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Kinetic energy is a ____ quantity
• Tensor
• Scalar
• Vector
• Negative

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• Heat
• Machination
• Work
• Force

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Work is done when:
• A force acts through a distance.
• A hot object touches a cold object.
• A force acts perpendicular to a displacement
• You sleep on the job.

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Energy stored in an object that has been lifted in a gravitational field is called:
• Elastic potential energy
• Gravitational potential energy
• Chemical potential energy.
• Thermal energy.

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If an object’s speed doubles its kinetic energy:
• Doubles
• Is cut in half.
• Doesn’t change

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How much work is done if you push a 5.0 kg box 12 meters across the floor while applying a 10.0 N force?
• 50 J
• 60 J
• 120 J
• 600 J

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• None
• 3.0 J
• 30 J
• 3.0 kJ

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_____ describes how quickly energy is transferred.
• Kinetic energy
• Velocity
• Power
• Pressure

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The SI units of power are:
• Joules
• Teslas
• Pascals
• Watts

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A Watt is equal to
• N m
• J s
• N/m2
• J/s

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I have 1.2 kW microwave. How much electrical energy is converted if I heat something on high for 30 seconds?
• 40 J
• 400 J
• 600 J
• 36 kJ

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If the power output of a motor is 65 W, how long does it take to do 195 J of work?
• 1.95 seconds
• 3.0 seconds
• 260 seconds
• 3.5 hours

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________ is where we decide to set gravitational potential energy to zero.
• The null zone
• Outer space
• The reference level
• On top of spaghetti

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Which of the following is a conservative force?
• Friction
• Thrust
• Gravity
• Air resistance

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A 4.0 kg object is moving has 72 J of kinetic energy when it is 3.0 m above the reference level. Its speed is
• 2.0 m/s
• 5.0 m/s
• 6.0 m/s
• 192 m/s

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A 4.0 kg object has 72 J of kinetic energy when it is 3.0 m above the reference level. Its total mechanical energy is
• 0.0 J
• 72 J
• 120 J
• 192 J

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A 4.0 kg object has 72 J of kinetic energy when it is 3.0 m above the reference level. Once it falls down to the reference level it will have a kinetic energy of

• 72 J
• 120 J
• 192 J
• 0.0 J

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Simple machines can NOT
• Multiply the force that is exerted
• Multiply the work that is done
• Change the direction a force is exerted
• Change the speed

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The mechanical advantage of a simple machine describes
• How much the machine multiplies the work you do
• How much the distance is multiplied
• How much the force is multiplied
• How much the power is multiplied

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The efficiency of a machine describes:
• The ratio of the output work to the input work
• The ratio of the output force to the input force
• The ratio of the output distance to the input distance

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If a machine has a mechanical advantage of 5.0 how much force must you exert to lift a 60 kg object?
• 60 N
• 120 N
• 300 N
• 3.0 kN

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An input of 8.0 kJ of work is is provided to a machine that exerts a 2.0 kN force through a distance of 3.0 meters. What is the efficiency?

• 25%
• 37.5 %
• 75%
• 133%

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A pulley is used to raise a 2.0 kg object 50 cm off of the table. The work done BY the machine is:
• 1.0 kJ
• 100 J
• 10.0 J
• 1.0 J

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A pulley is used to raise a 2.0 kg object 50 cm off of the table. The person pulling the string exerts a force of 8.0 N through a distance of 2.0 m. How much work is done by the person?

• 1.0 J
• 10.0 J
• 4.0 J
• 16 J

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A pulley is used to raise a 2.0 kg object 50 cm off of the table. The person pulling the string exerts a force of 8.0 N through a distance of 2.0 m. The mechanical advantage of the machine is

• 4.0
• 2.5
• 2.0
• 0.50

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A pulley is used to raise a 2.0 kg object 50 cm off of the table. The person pulling the string exerts a force of 8.0 N through a distance of 2.0 m. The efficiency of the machine is

• 31%
• 63%
• 100%
• 160%

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A pulley is used to raise a 2.0 kg object 50 cm off of the table. The person pulling the string moves their hand 2.0 m. What is the IMA of the machine?

• 4.0
• 2.5
• 0.25
• 10.0

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