You're saying that it is the same thing to add or subtract B. This means that B must be the zero vector.
This works with numbers as well, if you feel more familiar to think it this way: in general, if you add something to a number you make it bigger, whereas if you subtract it, you make it smaller.
The only way to cause adding and subtracting to be the same thing is to add or subtract zero: in both cases, you're doing nothing.
Answer:
Explanation:
Given
CD has a playing time of
Initial angular speed of CD is
Final angular speed of DC is
Angular speed, when rpm is given
Final speed
Using equation of angular motion
Insert the values
Magnitude of angular acceleration is
Answer:
momentum = mass x velocity
Explanation:
So ultimately, find the mass of the object (be careful since this is not the same as weight. Weight is your gravitational pull to the earth. This means that your weight different amounts on different planets. But mass stays the same on all planets, it's what most people call their weight.) and then find the velocity (2 meters/second north, etc.)
Now you can apply this to your problem
Answer:
Find answers below.
Explanation:
Given the following data;
c. Power = 180 Watts
Time = 2 hours = 60*60*2 = 7200 seconds
To find the energy used;
Energy = power * time
Energy = 180 * 7200
Energy = 1296000 Joules
d. Power = 210 Watts
Time = 3 hours = 60*60*3 =
Energy = 210 * 10800
Energy = 2268000 Joules
The satellite would have to be 26,000 miles high up