A space probe is landing on the surface of a planet. At which of the following distances would the probe feel the largest gravitational pull toward the planet?

A. 15,000km

B. 10,000km

C. 7,000km

D. 5,000km

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

Which of the following are appropriate acceleration units?