Tue Jan 31 Today Review hw 5. 5 Read p293-295. (p280) 83,87,91 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=(mv2)/2 K=(mv)2/2 K=2mv2 K=(mg)/h 0 of 30

The SI units for energy and work are: Newtons Watts Joules Amperes 0 of 30

Kinetic energy is a ____ quantity Tensor Scalar Vector Negative 0 of 30

The transfer of energy by mechanical means is called _______. Heat Machination Work Force 0 of 30

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. 0 of 30

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. 0 of 30

If an object’s speed doubles its kinetic energy: Quadruples Doubles Is cut in half. Doesn’t change 0 of 30

The kinetic energy of a 4.0 kg object moving at 3.0 m/s is:

How much work is done if you push a 5 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 0 of 30

How much work do you do if you lift a 6.0 kg object 50 cm up? None 3.0 J 30 J 3.0 kJ 0 of 30

_____ describes how quickly energy is transferred. Kinetic energy Velocity Power Pressure 0 of 30

The SI units of power are: Joules Teslas Pascals Watts 0 of 30

A Watt is equal to N m J s N/m2 J/s 0 of 30

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 0 of 30

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 0 of 30

________ is where we decide to set gravitational potential energy to zero. The null zone Outer space The reference level On top of spaghetti 0 of 30

Which of the following is a conservative force? Friction Thrust Gravity Air resistance 0 of 30

A 4. 0 kg object is moving has 72 J of kinetic energy when it is 3 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 0 of 30

A 4. 0 kg object has 72 J of kinetic energy when it is 3 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 0 of 30

A 4. 0 kg object has 72 J of kinetic energy when it is 3 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 0 of 30

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 0 of 30

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 0 of 30

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 0 of 30

If a machine has a mechanical advantage of 5 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 0 of 30

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% 0 of 30

A pulley is used to raise a 2. 0 kg object 50 cm off of the table 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 0 of 30

A pulley is used to raise a 2. 0 kg object 50 cm off of the table 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 0 of 30

A pulley is used to raise a 2. 0 kg object 50 cm off of the table 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 0 of 30

A pulley is used to raise a 2. 0 kg object 50 cm off of the table 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% 0 of 30

A pulley is used to raise a 2. 0 kg object 50 cm off of the table 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 0 of 30