Mechanics | Relativity Answers

Planet x is 265 earth orbital radii from the sun, what is the period of revolution in earth year?

What is the magnitude of the force of attraction between proton and neutron in H-2 nucleus if distance between their center is 1*10^-12?

A bullet of mass 0.00114 kg and speed v passes completely through a pendulum bob of mass
69.6 kg.
The bullet emerges with a speed v/2.
The pendulum bob is suspended by a stiff rod
of length 0.449 m and negligible mass.
The acceleration of gravity is 9.8 m/s2 .


What is the minimum value of v such that the pendulum bob will barely swing through
a complete vertical circle?
Answer in units of m/s.

A rocket is fired vertically upward.&
At theinstant it reaches an altitude of 1630 m and a
speed of 277 m/s, it explodes into three equal
fragments.&
One fragment continues to moveupward with a speed of 212 m/s following the
explosion.&
The second fragment has a speedof 475 m/s and is moving east right after the
explosion.&
What is the magnitude of the velocity ofthe third fragment?
Answer in units of m/s.

A 7.6 kg chair is pushed across a frictionless floor with a force of 42 N that is applied at an angle of 22° downward from the horizontal. What is the magnitude of the acceleration of the chair?

The Earth has a mass of 5.98 x 10^24 kg and its mean radius is 6.37 x 10^6 m. Using these values, calculate the acceleration due to gravity at the surface of the Earth.

The gravitational pull of the Sun on the Earth is stronger than the pull on the moon, yet the moon is the major source of tides. Is this true? and if true, why is the Sun not a major factor in the tides?

Why are satellite TV dishes (Dish, Direct TV, etc.) in the Northern Hemisphere pointed South and in the Southern Hemisphere pointed North? Why do we not put TV satellites above Texas where they belong?

The period of a satellite is the primary way that the mass of planets is determines. The equation used for this calculation uses the fact that the gravity of the planet provides the centripetal force to keep the satellite in orbit. The distance from the Earth to the Moon is 3.8 x 10^8 m and the period of th moon is approximately 27.3 days. Use the formula derived for this purpose to calculate the mass of the Earth. M = (4π^2r^3)/(G T^2) where T is the period of the moon's orbital rotation.

Please help me!!

Joe has a mass of 50 kg and Sally has a mass of 30 kg. They sit in class with a separation of 0.5 meters. What is the gravitational attraction between Joe and Sally.