The total number of protons plus neutrons in an atom of ⁴⁵₂₀Ca is

A.) 20

B.) 25

C.) 45

D.) 65

How many students would it take to move 10 teachers, together exerting a force of 50 000N, once around a 400m track. Each students contributes 2000kJ of work.

All of the following are physical properties of chlorine except it

Which can you do to reduce the power consumption in your home? A Add more circuit breakers. B Wire more parallel circuits. C Replace 75-watt light bulbs with 40-watt light bulbs.

Adoption process of the SI system by all the worlds nations is called

A car is traveling 15m/s starts to decelerate steadily. It comes to a complete stop in 10 seconds. what is it's acceleration?

Kendall has empty graduated cylinder with markings and an identical graduated cylinder partway filled with water. She also has a balance and a marble. Which statement best describes what Kendall can do? A.

2. With regard to the pH scale, a solution with a pH A. higher than 7 is considered an acid. B. lower than 7 is considered basic. C. of 6 is considered neutral. D. close to 14 is considered a strong base.

If a car rolls gently off a vertical cliff, how long does it take to reach 90km/hr.

In the game of volleyball, what skill relates to Newton's second law

The minimum breaking distance d in feet for a typical vehicle can be modeled with the equation d (v) = 0.045v2, where v is the vehicle's speed in miles per hour.