Two planets in space gravitationally attract each other. if both the masses and distances are doubled, the force between them is

A student said, "The displacement between my dorm and the lecture hall is 1 kilometer." Is he using the correct physical quantity for the information provided? What should he have called the 1 kilometer?

The British attempted to break the land-speed record and the sound barrier using a jet-powered car. They made their attempt in the morning because this is when the air was coolest. This suggests that the relationship in which graph is true?

The number of electrons in a copper penny is approximately 10*10^23. How large would the force be on an object if it carried this charge and were repelled by an equal charge one meter away? I am using don't panic volume 2.

In an electromagnetics lab, you are studying two coils which have a mutual inductance of M=300 mH. Suppose that the current in the 1st coil increased linearly from 2.8 A to 10 A in a span of 300 ms and that the 2nd coil has a resistance of R=0.

The current in one wire is 5.00 a. what is the current in the other wire.

Suppose s (t) is the position of an object moving along a line at time t is greater than or equal to 0. What is the average velocity between the times t=a and t=b? What is the instantaneous velocity at t=a?

Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1-km/h speed, has a 0.5-m width, and a field is 360 ft long and 160 ft wide. 1 m = 3.281 ft.

Badri makes the table below to review the factors that affect the electric force between objects. Which change will correct the error in Badri's table?

A star with the same mass of the sun has a newly discovered planet whose semi-major axis of 2.48 au and an eccentricity of 0.08. what is the aphelion distance of the new planet

A weather balloon is inflated to a volume of 2.2 x 10^3 L with 374 g of helium. What is the density of helium in grams per liter?