Physics Gravitation Level: High School
Motion of a Satellite in an Orbit
The earth exerts a gravitational force on the moon that is constantly accelerating the moon towards the earth , and yet the moon never hits the earth . Explain why this is so .
Physics Gravitation Level: High School
The heliocentric model of the solar system gained preference over the early Greek model using epicycles because.a) The heliocentric model gave a more accurate description of observed planetary motion .
b) Only the heliocentric model could explain retrograde motion .
c) The heliocentric model was simpler .
Physics Gravitation Level: High School
Suppose a planet has a mass of 100 times that of the earth and a radius , which is ten times that of earth . The acceleration of gravity on the surface of the planet , expressed in units of the earth’s acceleration of gravity , g , isa) g.
b) 10 g.
c) 100 g.
d) 1/10 g.
e) 1/100 g.
Physics Gravitation Level: High School
Europa , one of Jupiter’s moons , has an average distance of 6.7 x 10^6 km from the center of the planet (circumference equals 2 pi r) . Its orbital period is 3.6 days . In metric units , what is Europa’sa) Orbital speed
b) Acceleration
Physics Gravitation Level: High School
The moon orbits the earth with a speed of 27.3 days at an average distance of 380000 km . The mass of the earth is 6 x 10e24 kg and the force of gravity between the earth and the moon is 2.05 x 10e20 Newton’s . Calculate the mass of the moon in kilograms .
Physics Gravitation Level: High School
The Gravitational Force
The weight of an object is the same on two different planets . The mass of planet A is only twenty-five percent that of planet B . Find rA/rB , which is the ratio of the radii of the planets .
Physics Gravitation Level: High School
The Gravitational Force
A rock of mass 30 kg accidentally breaks loose from the edge of a cliff and falls straight down . The magnitude of the air resistance that opposes its downward motion is 270 N . What is the magnitude of the acceleration of the rock ?
Physics Gravitation Level: High School
The Gravitational Force
A bowing ball (mass = 7.2 kg , radius = 0.11 m ) and a billiard ball (mass = 0.32 kg, radius = 0.028 m) may each be treated as uniform spheres . What is the magnitude of the maximum gravitational force that each can exert on the other ?
Physics Gravitation Level: High School
A neutron star (next to final stage in stellar evolution) has a mass M = 3.0 x 10^32 kg . The star collapses to singularity (a block hole ) . Assuming only Newton’s Law of Universal Gravitation , where the gravitational force Fg = (G*M*m2) r^2 and using the centripetal force acting upon a body of mass m2, moving in a circular path a Fc = m2v^2/r, and letting v = c, the speed of light , estimate the final radius of collapse of the star .
Physics Gravitation Level: High School
A 60 kg geologist stands in Death Valley and measures the acceleration due to gravity at g = 9.82 m/s . Take 6.3 x 10^6 m as her distance from the Earth’s center.a. What is her weight in Death Valley ?
b. This same geologist climbs Mt. Everest to a height of 6 x 10^3m. What is her weight on top of Mt. Everest ?
Physics Gravitation Level: High School
A block whose weight is 34.0 N rests on a horizontal table . A horizontal force of 48 N is applied to the block . The coefficient of static and kinetic friction are 0.650 and 0.420 N , respectively . Will the block move under the influence of the force , and , if so , what will be the blocks acceleration ? (If not enter 0)
Physics Gravitation Level: High School
Three particles are far away from any other objects and located on a straight line . The masses of these particles are mA = 363 kg , mB = 517 kg, mC = 154 kg . Find the magnitude and direction of the net gravitational force acting on each of three particles (let the direction to the right be positive )
Physics Gravitation Level: High School
A small asteroid begins falling towards the Earth from the Asteroid belt between the planets Mars and Jupiter (average distance from Earth = 3 AU where 1 AU = 1.5 x 10(8th) km) . Neglecting the gravitational force of the other planets and the Sun , what would be the maximum velocity (km/s) of the asteroid when it strikes the Earth’s surface ?
Physics Gravitation Level: High School
Would a flash float to the surface , sink or stay at the same depth , if the gravitational field of the Earth increased ?Physics Gravitation Level: High School
If our Sun shrank in size to become a black hole, use the Newton’s Universal Gravitational Law to explain how the Earth’s orbit would be affected ?