Which type of wave is used in cell phone communication and radar devices?
a. light waves
b. gamma waves
c. infrared waves
d. microwaves
Solved
Show answers
More tips
- P Photography and Videography How to Choose the Perfect Photo Paper for Your Images?...
- H Health and Medicine What vaccines do children need?...
- H Health and Medicine Reasons for the Appearance of Warts: Everything You Need to Know...
- A Art and Culture How to Learn Screaming: Step-by-Step Guide for Beginners...
- H Health and Medicine Contraceptive Pills After 35: The Importance Of Choosing The Right Medication...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
- C Computers and Internet How to Learn to Type Fast?...
Answers on questions: Physics
- M Mathematics If x is the first, or smallest, of three consecutive integers, express the sum of the integer and the third integer as an algebraic expression containing the variable x....
- C Chemistry What does the presence of tiny crystals in a piece of igneous rock tell you about it?...
- H History Read the chart. In 2017, the government spent the least amount of money on which discretionary spending category? Department of Defense Health and Human Services Department Social...
- H History What is the purpose of equal employment opportunity (EEO) laws? O A. To force employees to join unions OB. To prevent employers from ever terminating workers C. To protect basic...
- M Mathematics How does the 3 in the millions place compare to the 3 in the ten millions place in the number below? 733,776,094 A. The 3 in the ten millions place is one-tenth of the 3 in the...
Ответ:
Ответ:
.
Explanation:
By Newton's Second Law of motion, the net force on an object is proportional to its acceleration.
The acceleration of an object is the rate of change in its velocity relative to time. On the other hand, the question states that this bookcase is moving at a "constant" velocity. In other words, there is no change in the bookcase's velocity. That means that the rate of change in velocity is zero. Hence, the acceleration of the object is also zero.
By Newton's Second Law of motion, the net force on this object would also be zero.
What about the 160 N of horizontal force? Think about how the floor's normal force on the bookcase balances gravity pull. There is likely another horizontal force (e.g., friction) that balance the 160 N force by acting in the opposite direction. Hence, the overall effect on the bookcase (the net force) would be zero.
In general, whenever an object is moving at constant velocity (in the same direction,) or not moving at all, that object is in a translational equilibrium. The net force on the object would be zero.