Question 1 A 10.0 kg bowling ball and a 11.3 kg bowling ball rest on a rack 13.4 m apart. Part A What is the force of gravity exerted on each of the balls by the other ball? Enter your answer in scientific notation, with 4 significant figures. Part B At what separation is the […]

## Physics 115: Lecture 03

Recap from yesterday: Also, always = Example The Earth’s radius is about 6370km. An object of mass 20kg at the surface, is taken to a height of 160km. A) What is the object’s mass at 160km? B) How much does the object weigh at ground level? C) How much does it […]

## Physics 115: Lecture 02

Equations used tonight: Experimentally, we find Gravity is a force, so Calculate the acceleration of the 2kg object. Draw a diagram No coordinate system needed Solve

## Pre-Lecture Quiz: The Gravitational Force

Question 1 Run the “Gravity Force Lab“. Maximize the window. Set both masses to 50.00kg, and move them masses to 8m apart, center-to-center. (NOTE: You can drag the ruler around on the screen.) The forces shown in the window should now read approximately 0.00 000 000 2618N. Which of the following actions will double the […]

## Problem 6.65

A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is less than that at sea level . Part A What is the observatory’s altitude? Assume . Express your answer to two significant figures and include the appropriate units.

## Problem 6.47

In recent years, scientists have discovered hundreds of planets orbiting other stars. Some of these planets are in orbits that are similar to that of earth, which orbits the sun at a distance of , called 1 astronomical unit . Others have extreme orbits that are much different from anything in our solar system. The following problem relates to one of these planets […]

## Problem 6.39

Part A The mass of the sun is and its distance to the Earth is . What is the gravitational force of the sun on the earth? Express your answer to three significant figures and include the appropriate units. Part B The mass of the moon is and its distance to the Earth is . […]

## Problem 6.37

In recent years, astronomers have found planets orbiting nearby stars that are quite different from planets in our solar system. Kepler-12b, has a diameter that is 1.7 times that of Jupiter , but a mass that is only 0.43 that of Jupiter . Part A What is the value of on this large, but low-density, […]