Gravitational attraction between spheres

A brass sphere is placed 2m from another brass sphere of mass 5kg. The mutual gravitational attraction between these spheres is measured to be 7X10^-9N. Find the mass of the first sphere.

Applying the uncertainty principle to a moving bullet.

A bullet of mass 25gm is moving with a velocity of 400m/s. The speed is measured accurately up to 0.02%. Calculate the certainty with which the position of the bullet can be located.

Radiations

PART ONE: The radiations of radioactive nuclides: A) affect the emulsion on a photographic film B) ionize surronding air molecules C) make certain compounds fluoresce D) do all of these PART TWO: The subatiomic research that can be conducted using particles and radiations from naturally radioactive sub ...continues

Gravitational forces

A 5kg mass is 4m away from a 10kg mass. Find the gravitational force on the 5kg mass due to the other mass. What is the force on the 10kg mass due to the 5kg mass? If both masses are free to move, what are their respective accelerations?

Electrons

PART ONE: According to the Bohr model of the atom, an electron cannot move from a lower energy orbit into a higher energy orbit: A) abruptly B) spontaneously C) unless it gains extacly enough energy D) unless it loses exactly enough energy PART TWO: No two electrons in an atom can have the same: A) orbi ...continues

Light

PART ONE: A bright line in the spectrum of an element such as hydrogen is associated with: A) an electron orbit of low energy B) an electron orbit of high energy C) the transfer of an electron from a low energy orbit to a high energy orbit D) the transfer of an electron from a high energy orbit to a low energy o ...continues

Grating Constant

Grating constants, problem attached.

Magnetics and Nuclides

PART ONE: The magnetic force between two long, straight, parallel conductors: A) increases as the distance between the wires decreases B) decreases as the length of the wires increases C) increases as the current in either wire decreases D) is independent of the length of the wires PART TWO: A nuclide of ...continues

Acceleration of a meteor

What is the acceleration of a meteor when it is at a distance of 6.7X10^6m from the center of the earth?

Satellite speed

A satellite of mass 1500kg is to be placed in a circular orbit of radius of 8000km around the earth. Find the speed of the satellite.