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Force and Motion 4th Grade
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Gravity
Terms in this set (11)
Force
a push or pull on an object that can cause it to change motion
Gravity
the force that pulls two objects toward one another because of their mass
Inertia
object in motion want to stay in motion - objects at rest want to stay at rest
Friction
a force that slows the motion of moving objects
Energy
the ability to do work
Potential Energy
energy that an object has because of position (you have more of this energy when you are at the top of a roller coaster)
Kinetic Energy
energy of motion
Mechanical Energy
the kind of energy an object has because it can move or because it is moving
Chemical Energy
energy that comes from chemical changes
Electrical Energy
energy that comes from the flow of electricity
work
the result of a force moving an object
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Verified questions
ENGINEERING
An insulated vertical piston–cylinder device initially contains $0.8 \mathrm{m}^{3}$ of refrigerant-134a at 1.4 MPa and $120^{\circ} \mathrm{C}.$ A linear spring at this point applies full force to the piston. A valve connected to the cylinder is now opened and refrigerant is allowed to escape. The spring unwinds as the piston moves down, and the pressure and volume drop to 0.7 MPa and $0.5 \mathrm{m}^{3}$ at the end of the process. Determine (a) the amount of refrigerant that has escaped and (b) the final temperature of the refrigerant.
ENGINEERING
The power $P$ dissipated as heat in a resistor $R$ as a function of the current $i ( t )$ passing through it is $P = i ^ { 2 } R .$ The energy $E ( t )$ lost as a function of time is the time integral of the power. Thus $$ E ( t ) = \int _ { 0 } ^ { t } P ( t ) d t = R \int _ { 0 } ^ { t } i ^ { 2 } ( t ) d t $$ If the current is measured in amperes, the power is in watts and the energy is in joules $( 1 \mathrm { W } = 1 \mathrm { J } / \mathrm { s } ) .$ Suppose that a current $i ( t ) = 0.2 [ 1 + \sin ( 0.2 t ) ] \mathrm { A }$ is applied to the resistor. a. Determine the energy $E ( t )$ dissipated as a function of time. b. Determine the energy dissipated in 1 min if $R = 1000 \Omega$ .
ENGINEERING
What is the Eulerian description of fluid motion? How does it differ from the Lagrangian description?
ENGINEERING
A ceiling fan consists of five blades of 0.80-m length and 0.10-m width which rotate at 100 rpm. Estimate the torque needed to overcome the friction on the blades if they act as flat plates.