Physics Flashcards
newton’s interest in mechanics was rekindled with the advent of a spectacular ______ in 1680
comet
isaac newton determined that gravity was what
universal
everything pulls on everything else in a beautifully simple way that involves only what and what
mass and distance
the universal gravitational constant can be expressed by what equation
F=G(m1m2)/d^2
the magnitude of G is the same as the gravitational force between two 1-kilogram masses that are 1 meter apart which is what numerical value in Newton’s?
6.67 x 10^-11
.0000000000667
calculating G alone was first done by the English physicist, ___________________ in 1798
henry cavendish
phillip von jolly attached a spherical flask of what element to a balance to also demonstrate gravitational force between 2 of objects
mercury
the phenomena wherein the effect of gravity from a localized source spreads uniformly throughout the surrounding space
inverse-square law
what is the weakest of all forces
gravity
the force of gravity can produce what
acceleration
the pressing against earth is the sensation we interpret as what
weight
ocean tides are caused by the ____________ in the gravitational pull between the moon and the earth on opposite sides of the earth
differences
what tides occur at the times of a new or full moon
spring
what tides occur when the moon is midway between new and full
neap
higher than average tides and lower than average low tides occur because the _____, _______, and ________ are aligned
sun, moon, earth
the suns pull is how many times that of the moon
2
the greatest tidal range can be found located in
bay of fundy
earthquakes and volcanic eruptions have a higher probability of occurring when earth is experiencing a ______ tide
spring
tidal effects in the __________ produce electric currents that alter the ________ field that surrounds earth
ionosphere, magnetic
the __________ penetration is evident in subtle changes in the behaviors of living things
cosmic-ray
the _______________________________ intensity inside a planet of uniform density is directional proportional to the radial distance from its center and is maximum at its surface
gravitational field
a concentration of mass resulting from gravitational collapse, near which gravity is so intense that not even light can escape is termed what
black hole
interplanetary forces causing planets to wobble in their orbits is termed what
perturbations
tracking the orbits of both uranus and neptune led to the discovery of which planet in 1930 where in arizona
pluto, lowell observatory
what planet was discovered at what observatory on linden street by johann galle
neptune, berlin
why is a black hole invisible
no light can escape
an astronaut lands on a planet that has the same mass as earth but twice the diameter. how does her weight differ from that on earth
corresponds 1/4
when will the gravitational force between you and the sun be greater, today at noon or tomorrow at midnight? why
noon- closer to the sun
the value of G at earth’s surface is about 9.8m/s^2. what is the value of G at a distance to twice earth’s radius
2.45m/s^2
