A runner races in the 100 meter dash. It takes her 7 seconds to finish. What is her average speed? (Give the speed with unit.)

You are sitting on the beach and wondering about the properties of mechanical waves. describe them in terms of ocean waves.

In a vernier instrument the main scale is in 1/2 mm divisions .vernier is made by redividing 19 such divisions into 20 equal parts. calculate the least count of the instrument.

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer