Jorge is testing a mineral by seeing whether it can be scratched by a penny. What property of the mineral is Jorge testing? A.
color
B.
luster
C.
streak
D.
hardness

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

Prior knowledge can be gained from personal experience and a) forming well-developed hypotheses. b) listening to opinions of other people on a topic. c) researching previous experiments and results on a topic. eliminate d) no other methods. it can only be gained by personal experience.

1. you serve a volleyball with a mass of 2.1 kg. the ball leaves your hand with a speed of 30 m/s. the ball has energy. calculate it. 2. a baby carriage is sitting at the top of a hill that is 21 m high. the carriage with the baby weighs 12 n. the carriage has energy. calculate it. 3. a car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. the car has . calculate it.