An element's atomic number is 39. How many protons would an atom of this element have?

A train travels 86 kilometers in 1 hours, and then 98 kilometers in 1 hours. What is its average speed?

When electricians use wiring for houses they use both copper and rubber. Which do you think is used as a conductor?

Which group occupies the large middle section of the periodic table?

A 5 kg rock is raised 28 m above the ground level. What is the change in its potential energy?

What does the term caustic mean?

In a laboratory, you determine that the density of a certain solid is 5.23*10-6kg/mm3. Convert this density into kilograms per cubic meters.

List the solar objects in correct order from the Sun. Venus Earth Mercury Saturn Neptune Mars Jupiter Asteroid Belt The Sun Uranus

The power exerted by a muscle is the product of the force exerted and the velocity of contraction. The area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?

How can you tell one element from another?

Which of the following is not an accurate statement about the attitude of teenagers when driving