The atoms that make up a star can be determined by a. the color
b. the position of the star in its galaxy
c. the stars emission spectrum
d. the star corona

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?