What are the first and second object in a gravitational field

What are the standard units of length, mass, and volume in the metric system?

Which forms first: protoplanets or planetesimals?

An object is moving initially with a velocity of 4.7 m/s. After 3.9 s the object's velocity is - 2.1 m/s. What is the object's average acceleration during this time? I believe that the vf is - 2.1 m/s vi should be 4.7 m/s and the t should be 3.

Substance a has a density of 3 g/cm3 and substance b has a density of 4 g/cm3. in order to obtain equal masses of these two substances, what must be the ratio of the volume of a to the volume of b?

A man is 9m behind the door of a train when it starts moving with acceleration of 2m/s2. The man runs at full speed. How far does he run and after what time does he get into the train? What is his full speed?

Kendall has empty graduated cylinder with markings and an identical graduated cylinder partway filled with water. She also has a balance and a marble. Which statement best describes what Kendall can do? A.

2. With regard to the pH scale, a solution with a pH A. higher than 7 is considered an acid. B. lower than 7 is considered basic. C. of 6 is considered neutral. D. close to 14 is considered a strong base.

If a car rolls gently off a vertical cliff, how long does it take to reach 90km/hr.

In the game of volleyball, what skill relates to Newton's second law

The minimum breaking distance d in feet for a typical vehicle can be modeled with the equation d (v) = 0.045v2, where v is the vehicle's speed in miles per hour.