Martina has a sample of an unknown substance. she measures the substance. it’s mass is 13.5 grams, and it’s volume is 5 cm3 .which metal might her sample be made of?

What you see with your eyes is a form of energy. a. light b. heat c. chemical d. electrical

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excesselectrons is typical. what is the magnitude of the electric forceon a protein with this charge in a 1500 n/c electric field?