isotopes, relative atomic mass and mass
... atoms are too small to be weighed directly, (although their masses can be determined indirectly by measuring their effect on each other). Atoms are so tiny that knowing the mass of any individual atom isn’t very useful, as chemists never carry out any experimental or practical work on just one atom ...
... atoms are too small to be weighed directly, (although their masses can be determined indirectly by measuring their effect on each other). Atoms are so tiny that knowing the mass of any individual atom isn’t very useful, as chemists never carry out any experimental or practical work on just one atom ...
Ch 9 Gravity and Circular Motion
... found by applying a modified version of the equation for g on Earth. The equation can be rewritten to apply to any mass and radius as follows: g = GM/R2 • The following example shows how the equation may be used to find the acceleration of gravity on the surface of the Moon. ...
... found by applying a modified version of the equation for g on Earth. The equation can be rewritten to apply to any mass and radius as follows: g = GM/R2 • The following example shows how the equation may be used to find the acceleration of gravity on the surface of the Moon. ...
C:\My Documents\Mahopac School Work 2001-2002
... contains as many elementary particles (atoms, molecules, ions, etc.) as there are atoms in exactly 12 grams of the carbon-12 isotope. The term mole is the name of a number of items similar to a pair (2 items), a dozen (12 items), and a gross (144 items). The currently accepted value for one mole is ...
... contains as many elementary particles (atoms, molecules, ions, etc.) as there are atoms in exactly 12 grams of the carbon-12 isotope. The term mole is the name of a number of items similar to a pair (2 items), a dozen (12 items), and a gross (144 items). The currently accepted value for one mole is ...
Ch33
... • the net external torque tnet,ext on the wheel is therefore of magnitude Mgd, and it points which way? This is the same as the (instantaneous) direction of dL/dt, of course!! • right! into the page!! So L’s change is into the page, which means that L moves around on a big circle • The wheel does NO ...
... • the net external torque tnet,ext on the wheel is therefore of magnitude Mgd, and it points which way? This is the same as the (instantaneous) direction of dL/dt, of course!! • right! into the page!! So L’s change is into the page, which means that L moves around on a big circle • The wheel does NO ...
REVIEW 10 Force and Motion Just as Alicia was about to kick the
... that objects in motion needed a force to keep them in motion. Isaac Newton, however, showed that this is not true. Newton's first law of motion says that the object will continue doing what it is doing (whether it is in motion or at rest) if the forces acting on an object are balanced (equal and opp ...
... that objects in motion needed a force to keep them in motion. Isaac Newton, however, showed that this is not true. Newton's first law of motion says that the object will continue doing what it is doing (whether it is in motion or at rest) if the forces acting on an object are balanced (equal and opp ...
PHYS101 - Concord University
... Mars has two moons, each much smaller than the earth’s moon. The smaller of these two bodies, Deimos, isn’t quite spherical, but we can model it as a sphere of radius 6.3 km. Its mass is 1.8 × 1015 kg. At what speed would a projectile move in a very low orbit around Deimos? ...
... Mars has two moons, each much smaller than the earth’s moon. The smaller of these two bodies, Deimos, isn’t quite spherical, but we can model it as a sphere of radius 6.3 km. Its mass is 1.8 × 1015 kg. At what speed would a projectile move in a very low orbit around Deimos? ...
1. What is unit vector? 2. State the principle of transmissibility.
... 9. (i) What is limiting friction? (ii) A pull of 250 N inclined at 30° to the horizontal plane is required just to move a body kept on a rough horizontal plane. But the push required just to move the body is 300 N. If the push is inclined at 30° to the horizontal, find the weight of the body and the ...
... 9. (i) What is limiting friction? (ii) A pull of 250 N inclined at 30° to the horizontal plane is required just to move a body kept on a rough horizontal plane. But the push required just to move the body is 300 N. If the push is inclined at 30° to the horizontal, find the weight of the body and the ...
PHYSICS 2C
... 1. Carefully measure 2 to 3 meters of string and measure the mass of it. Find the linear density . Since this one value will be used in all our calculations, make several measurements and zero the scale before each measurement. 2. Clamp the vibrator and the pulley at opposite ends of the table as t ...
... 1. Carefully measure 2 to 3 meters of string and measure the mass of it. Find the linear density . Since this one value will be used in all our calculations, make several measurements and zero the scale before each measurement. 2. Clamp the vibrator and the pulley at opposite ends of the table as t ...
LAWS OF MOTION interview
... misunderstood. This law states that: When an object exerts a force on a second object, the second object will exert a force of equal magnitude, and opposite direction on the first object" This law is most commonly stated as 'for every action there exists an equal and opposite reaction.' The flaw in ...
... misunderstood. This law states that: When an object exerts a force on a second object, the second object will exert a force of equal magnitude, and opposite direction on the first object" This law is most commonly stated as 'for every action there exists an equal and opposite reaction.' The flaw in ...
Phy I (AP Phy I) Exams and Keys Corrected 2016 Season
... 7. With what acceleration will this mass slide down the ramp when released? (A) 1.6 m 2 (B) 4.4 m 2 (C) 6 m 2 (D) 10 m 2 s s s s 8. Once the mass reaches the bottom of the ramp and is stationary, what force would have to be applied parallel to the ramp in order for the mass to move up the ramp at a ...
... 7. With what acceleration will this mass slide down the ramp when released? (A) 1.6 m 2 (B) 4.4 m 2 (C) 6 m 2 (D) 10 m 2 s s s s 8. Once the mass reaches the bottom of the ramp and is stationary, what force would have to be applied parallel to the ramp in order for the mass to move up the ramp at a ...
lecture 4 powerpoint - Department of Physics & Astronomy
... collision. Are the following true or false? • The force of the car on the truck is equal and opposite to the force of the truck on the car. • The momentum transferred from the truck to the car is equal and opposite to the momentum transferred from the car to the truck. • The change of velocity of th ...
... collision. Are the following true or false? • The force of the car on the truck is equal and opposite to the force of the truck on the car. • The momentum transferred from the truck to the car is equal and opposite to the momentum transferred from the car to the truck. • The change of velocity of th ...
Abby AII1 C083 Ye, Zi Topic: Energy in Simple harmonic motion
... itself at standard intervals in a specific manner - and sinusoidal, with constant amplitude; the acceleration of a body executing SHM is directly proportional to the displacement of the body from the equilibrium position and is always directed towards the equilibrium position. The motion is characte ...
... itself at standard intervals in a specific manner - and sinusoidal, with constant amplitude; the acceleration of a body executing SHM is directly proportional to the displacement of the body from the equilibrium position and is always directed towards the equilibrium position. The motion is characte ...
Mass versus weight
In everyday usage, the mass of an object is often referred to as its weight though these are in fact different concepts and quantities. In scientific contexts, mass refers loosely to the amount of ""matter"" in an object (though ""matter"" may be difficult to define), whereas weight refers to the force experienced by an object due to gravity. In other words, an object with a mass of 1.0 kilogram will weigh approximately 9.81 newtons (newton is the unit of force, while kilogram is the unit of mass) on the surface of the Earth (its mass multiplied by the gravitational field strength). Its weight will be less on Mars (where gravity is weaker), more on Saturn, and negligible in space when far from any significant source of gravity, but it will always have the same mass.Objects on the surface of the Earth have weight, although sometimes this weight is difficult to measure. An example is a small object floating in a pool of water (or even on a dish of water), which does not appear to have weight since it is buoyed by the water; but it is found to have its usual weight when it is added to water in a container which is entirely supported by and weighed on a scale. Thus, the ""weightless object"" floating in water actually transfers its weight to the bottom of the container (where the pressure increases). Similarly, a balloon has mass but may appear to have no weight or even negative weight, due to buoyancy in air. However the weight of the balloon and the gas inside it has merely been transferred to a large area of the Earth's surface, making the weight difficult to measure. The weight of a flying airplane is similarly distributed to the ground, but does not disappear. If the airplane is in level flight, the same weight-force is distributed to the surface of the Earth as when the plane was on the runway, but spread over a larger area.A better scientific definition of mass is its description as being composed of inertia, which basically is the resistance of an object being accelerated when acted on by an external force. Gravitational ""weight"" is the force created when a mass is acted upon by a gravitational field and the object is not allowed to free-fall, but is supported or retarded by a mechanical force, such as the surface of a planet. Such a force constitutes weight. This force can be added to by any other kind of force.For example, in the photograph, the girl's weight, subtracted from the tension in the chain (respectively the support force of the seat), yields the necessary centripetal force to keep her swinging in an arc. If one stands behind her at the bottom of her arc and abruptly stops her, the impetus (""bump"" or stopping-force) one experiences is due to acting against her inertia, and would be the same even if gravity were suddenly switched off.While the weight of an object varies in proportion to the strength of the gravitational field, its mass is constant (ignoring relativistic effects) as long as no energy or matter is added to the object. Accordingly, for an astronaut on a spacewalk in orbit (a free-fall), no effort is required to hold a communications satellite in front of him; it is ""weightless"". However, since objects in orbit retain their mass and inertia, an astronaut must exert ten times as much force to accelerate a 10‑ton satellite at the same rate as one with a mass of only 1 ton.On Earth, a swing set can demonstrate this relationship between force, mass, and acceleration. If one were to stand behind a large adult sitting stationary on a swing and give him a strong push, the adult would temporarily accelerate to a quite low speed, and then swing only a short distance before beginning to swing in the opposite direction. Applying the same impetus to a small child would produce a much greater speed.