Troy investigates the density of an unknown piece of metal in the laboratory. Density is equal to mass divided by volume. The mass of the metal is 10.7 grams, and its volume is 1.5 cm³. Based on the data in this table conclusion can Troy make about the unknown metal? TABLE: gold=19.3, lead=11.4, silver=10.5, zinc=7.13. (Numbers in Density (g/cm³)

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?