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Selina Solutions Class 8 Physics Solutions for Exercise Short/Long Answer Questions in Chapter 3 - Force and Pressure
Question 7 Short/Long Answer Questions
Q7] State two factors which affect the moment of force.
Answer:
Solution:
Factors on which moment of force depends are:
[i] The magnitude of the force applied.
[ii] The distance of line of action of the force from the axis of rotation.
Video transcript
hello welcome to lead room work my name is nirasana today we are going to see check whether the following quantities form a proportion or not so here we have pi equations so whether we need to check that it's going to form the proportion or not so first question is 3x7x 24 and 56 so when you check it out here just 3x 3x into 56 is equals to 7x into 24 yes then 168x equals to 168x so rhs is is lhs equals to rhs is going to form the proportion now okay this proportional form check for second one this first one check the second one the same way zero point eight into nine equals to two point four into three this also forms seven point two equal to seven point two let's just equal storage it's also formula proportion check with third one same way third one is given uh yeah so one one by two into 9 3 by 4 equals to 3 1 by 4 into 4 1 by 2. now if you check it out it's going to form the proportion as 1 1 by 1 1 7 by eight equals to 1 1 7 by yields it's also from the proportion now you can also check for the fourth and fifth let me do a you can do here yes check for fourth one here same way 0.4 into 3.5 is equals to zero point five into two point nine is going to be one point four zero equals to one point four zero proportion is formed for the fourth one also if you check for fifth one uh 5 by 2 into 6.0 is equal to 11 by 2 into 3.0 is equals to 30 by 2 equals to 30 by 2 it's also forming the operation the fifth one also so i hope you understood this video we need to check that lhs equal to rhs in all the cases then it's going to form the proportion thanks for watching this video if you have any queries you can put in the comment section
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What is multi-factor authentication?
Multi-factor authentication [MFA] is a method of logon verification where at least two different factors of proof are required. MFA is also referred to as 2FA, which stands for two-factor authentication. MFA helps keep protect your data [email, financial accounts, health records, etc.] or assets by adding an extra layer of security.
What are the types of multi-factor authentication?
There are generally three recognized types of authentication factors:
- Type 1 – Something You Know – includes passwords, PINs, combinations, code words, or secret handshakes. Anything that you can remember and then type, say, do, perform, or otherwise recall when needed falls into this category.
- Type 2 – Something You Have – includes all items that are physical objects, such as keys, smart phones, smart cards, USB drives, and token devices. [A token device produces a time-based PIN or can compute a response from a challenge number issued by the server.].
- Type 3 – Something You Are – includes any part of the human body that can be offered for verification, such as fingerprints, palm scanning, facial recognition, retina scans, iris scans, and voice verification.
By combining two or three factors from these three categories, a multi-factor authentication is crafted. Multi-factor authentication is preferred, as it is much more difficult for an intruder to overcome. With just a password, an attacker only has to have a single attack skill and wage a single successful attack to impersonate the victim. With multi-factor authentication, the attack must have multiple attack skills and wage multiple successful attacks simultaneously in order to impersonate the victim. This is extremely difficult and, thus, a more resilient logon solution.
Most online services and accounts offer true multi-factor authentication, and the number is growing. One excellent example of a multi-factor authentication supporting online service is that of PayPal. They currently offer at least two different multi-factor options. One option involves a credit card-sized device that produces on-demand a one-time-use six-digit PIN. The second option sends an SMS text message to your cell phone with a six-digit PIN. In either case, the PIN is used alongside your name and password credentials to gain access to your PayPal account.
Excerpted from the Global Knowledge white paper Multi-Step Authentication and Why Should I Use It.
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