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8th grade forces
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Gravity
Terms in this set (6)
Force
A push or pull exerted on an object
Newton
SI unit of force
Velocity
the speed of an object in a particular direction
Acceleration
The rate at which velocity changes
force diagram
a diagram showing all the forces acting on an object
Netforce
The sum of all forces acting on an object
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Verified questions
PHYSICS
What is the speed of light in water? In glycerine?
PHYSICS
If a skater who is spinning pulls her arms in so as to reduce her rotational inertia to half by how much will her rate of spin increase?
PHYSICS
A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A certain fraction of this energy is used to move the bicycle forward, but the balance ends up as thermal energy in his body, which he must get rid of to keep cool. On a very warm day, conduction, convection, and radiation transfer little energy, and so he does this by perspiring, with the evaporation of water taking away the excess thermal energy. If the cyclist reaches his 15 km/h cruising speed by rolling down a hill, what is the approximate height of the hill? A. 22 B. 11 m C. 2 m D. 1 m
PHYSICS
The product of the pressure and volume of a sample of hydrogen gas at $0.00 ^ { \circ } \mathrm { C }$ is 80.0 J. (a) How many moles of hydrogen are present? (b) What is the average translational kinetic energy of the hydrogen molecules? (c) What is the value of the product of pressure and volume at $200 ^ { \circ } \mathrm { C }$?