7th Grade Astronomy Study Guide
... ____ 26. Why do astronomers put telescopes in space? a. to avoid interference from the Earth’s atmosphere b. to avoid noise pollution c. to reduce air pollution d. to get closer to objects in space ____ 27. An advantage of reflecting telescopes over refracting telescopes is that a. they use lenses t ...
... ____ 26. Why do astronomers put telescopes in space? a. to avoid interference from the Earth’s atmosphere b. to avoid noise pollution c. to reduce air pollution d. to get closer to objects in space ____ 27. An advantage of reflecting telescopes over refracting telescopes is that a. they use lenses t ...
unit 3 dynamics
... 2. Electromagnetic: ( physical and magnetic) - Forces that exist between charged particles and magnets (ex. Hand on a table is actually repulsion of ...
... 2. Electromagnetic: ( physical and magnetic) - Forces that exist between charged particles and magnets (ex. Hand on a table is actually repulsion of ...
Galaxies - schoolphysics
... two giant plates held face to face with a diameter of a little over 100 000 light years and made up of some hundred thousand million (1011) stars as well as great clouds of gas. (See: 11-14/Astronomy/Text/Milky Way) ...
... two giant plates held face to face with a diameter of a little over 100 000 light years and made up of some hundred thousand million (1011) stars as well as great clouds of gas. (See: 11-14/Astronomy/Text/Milky Way) ...
Unit 8B: Forces Newton`s Laws of Motion
... ◦ Unbalanced forces cause a change in motion ◦ An unbalanced force is called a NET FORCE ...
... ◦ Unbalanced forces cause a change in motion ◦ An unbalanced force is called a NET FORCE ...
A Newton`s 2nd Law
... If a numerical value of g is required, take g = 9.8 ms-2. Give all non-exact answers correct to 3 significant figures unless otherwise specified. 1. A stone of mass 3 kg is projected along the surface of a frozen pond. It is given an initial velocity of 4 ms-1 and comes to rest after travelling 40 m ...
... If a numerical value of g is required, take g = 9.8 ms-2. Give all non-exact answers correct to 3 significant figures unless otherwise specified. 1. A stone of mass 3 kg is projected along the surface of a frozen pond. It is given an initial velocity of 4 ms-1 and comes to rest after travelling 40 m ...
Atwood Machine (AM)
... 3. If our data is described by “A Simplified Theory” (neglecting pulley inertia and friction), what should the slope of the plot be equal to? [1 pt] a. Fnet b. m1 – m2 c. m1 + m2 d. m1 + m2 + mp 4. If our data is described by “A Simplified Theory” (neglecting pulley inertia and friction), what shoul ...
... 3. If our data is described by “A Simplified Theory” (neglecting pulley inertia and friction), what should the slope of the plot be equal to? [1 pt] a. Fnet b. m1 – m2 c. m1 + m2 d. m1 + m2 + mp 4. If our data is described by “A Simplified Theory” (neglecting pulley inertia and friction), what shoul ...
Newton`s Laws of Motion Newton`s First Law of Motion Objects at
... the object (more inertia) the harder it is to start or stop. The Cadillac has more of a tendency to stay stationary (or continue moving), and resist a change in motion than a bicycle. Weight vs. Mass Mass is the amount of matter. It is a measure of inertia. Weight of an object is a result of the Ear ...
... the object (more inertia) the harder it is to start or stop. The Cadillac has more of a tendency to stay stationary (or continue moving), and resist a change in motion than a bicycle. Weight vs. Mass Mass is the amount of matter. It is a measure of inertia. Weight of an object is a result of the Ear ...
17.4 Inertia and Newton`s 1st law of motion
... moving, it resists being slowed down, speeded up, or changed in direction. The tendency of mass to keep doing whatever it is – standing still or moving in a straight line – is called inertia. Inertia is almost the same thing as mass – the more the mass the more the inertia. The diagram (right) shows ...
... moving, it resists being slowed down, speeded up, or changed in direction. The tendency of mass to keep doing whatever it is – standing still or moving in a straight line – is called inertia. Inertia is almost the same thing as mass – the more the mass the more the inertia. The diagram (right) shows ...
Grade 11 Physics – Course Review Part 2
... 1.50 cm. Find the electric force on an oil drop floating between the plates and carrying a charge of + 50e. 7. If the drop in the above problem has a mass of 1.6 x 10 – 13 kg, what will be its acceleration as it falls between the two plates? Assume the field points upwards. 8. What sort of field or ...
... 1.50 cm. Find the electric force on an oil drop floating between the plates and carrying a charge of + 50e. 7. If the drop in the above problem has a mass of 1.6 x 10 – 13 kg, what will be its acceleration as it falls between the two plates? Assume the field points upwards. 8. What sort of field or ...
Modified Newtonian dynamics
In physics, modified Newtonian dynamics (MOND) is a theory that proposes a modification of Newton's laws to account for observed properties of galaxies. Created in 1983 by Israeli physicist Mordehai Milgrom, the theory's original motivation was to explain the fact that the velocities of stars in galaxies were observed to be larger than expected based on Newtonian mechanics. Milgrom noted that this discrepancy could be resolved if the gravitational force experienced by a star in the outer regions of a galaxy was proportional to the square of its centripetal acceleration (as opposed to the centripetal acceleration itself, as in Newton's Second Law), or alternatively if gravitational force came to vary inversely with radius (as opposed to the inverse square of the radius, as in Newton's Law of Gravity). In MOND, violation of Newton's Laws occurs at extremely small accelerations, characteristic of galaxies yet far below anything typically encountered in the Solar System or on Earth.MOND is an example of a class of theories known as modified gravity, and is an alternative to the hypothesis that the dynamics of galaxies are determined by massive, invisible dark matter halos. Since Milgrom's original proposal, MOND has successfully predicted a variety of galactic phenomena that are difficult to understand from a dark matter perspective. However, MOND and its generalisations do not adequately account for observed properties of galaxy clusters, and no satisfactory cosmological model has been constructed from the theory.