The gravitational force of a star on an orbiting planet 1 is f1. planet 2, which is twice as massive as planet 1 and orbits at three times larger distance from the star, experiences gravitational force f2.
what is the ratio f2f1? you can ignore the gravitational force between the two planets.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

An astronaut floating in space is trying to use her jetpack to get back to her space station, but she is being pulled away by a nearby planet, as shown in the image below. her jetpack provides a constant thrust of 310 n. if she angles her jetpack in such a way that it cancels out the vertical force due to the planet's gravity, what is her net horizontal force? thaud 487 o a. 54.8 n toward the space station o b. 212.9 n toward the space station o c. 185.2 n toward the space station o d 956 n toward the space station

Aspring that is stretched 2.6 cm stores a potential energy of 0.053 j. what is the spring constant of this spring?