What is a requirement of doing work? a. speed b. energy c. mass d. weight

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

Mechanical energy is when there are no forces causing an object to lose energy. a. increased b. conserved c. decreased d. doubled i need this answer ! .

The theory that light exists in quantized "chunks" was proposed in response to which of the following? a. electron interference patterns o b. discovery of planck's constant o c. the ultraviolet catastrophe o d. emission spectra