Two positively charged objects are located so they are 0.20 m apart. If the objects are separated until their centres are 0.40 m apart, by what factor will the electrostatic force between them change?

What kind of scientist investigation involve making observations

In the open-economy macroeconomic model, if the supply of loanable funds increases, net capital outflow A. and the real exchange rate decrease. B. increases and the real exchange rate decreases. C. and the real exchange rate increase. D.

What nuclear physics means?

how many joules of heay are needed to raise the temperature of 10.0 g of aluminum from 22°c to 55°c, if the specific heat of aluminium is 0.90J/g°c

The separation between two protons is increased by a factor of 2. How does the force between them change? Question 19 options: increases by a factor of 2 increases by a factor of 4 decreases by a factor of 2 decreases by a factor of 4 doesn't change

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?

A dc generator is the same as a (n) a. electric motor. b. ac generator. c. armature. d. electric current.

Which of the following best describes scientific knowledge A.) Durable B.) Absolute and never changing C.) Frequently varies