Answer:
Paintball is a competitive team shooting sport in which players eliminate opponents from play by hitting them with spherical dye-filled gelatin capsules called paintballs that break upon impact. Paintballs are usually shot using low-energy air weapons called paintball markers that are powered by compressed air (nitrogen) or carbon dioxide and were originally designed for remotely marking trees and cattle
Answer:
Keeping the speed fixed and decreasing the radius by a factor of 4
Explanation:
A ball is whirled on the end of a string in a horizontal circle of radius R at constant speed v. The centripetal acceleration is given by :
We need to find how the "centripetal acceleration of the ball can be increased by a factor of 4"
It can be done by keeping the speed fixed and decreasing the radius by a factor of 4 such that,
R' = R/4
New centripetal acceleration will be,
So, the centripetal acceleration of the ball can be increased by a factor of 4.
Answer:
We sum the inverse of each resistance and then invert the sum.
Explanation:
The equivalent resistance in case of parallel combination of resistors is given by the formula as :
Here,
R is the equivalent resistance
are individual resistors that are connected in parallel
We can find the value of R as :
- Firstly, we add the inverse of the individual resistances.
- Secondly, we invert the sum that we get in above step.
So, the correct option is (a) "We sum the inverse of each resistance and then invert the sum".
a). The Earth travels around the sun in a path that's nearly a circle, with a radius of roughly 93 million miles.
The circumference of the circle is (2 · π · radius) = about 5.843 x 10⁸ miles.
Average Speed = (distance covered) / (time to cover the distance)
The time to cover the distance is 1 year.
Speed = (5.843 x 10⁸ mile/year) (year / 365 day) (day / 24 hour)
Speed = (5.843 x 10⁸ / 365·24) (mile · year · day / year · day · hour)
Average speed = 66,705 miles/hour .
b). The Earth's average velocity over a period of 1 year is zero.
Velocity = (displacement) / (time)
Displacement = (distance and direction between start-point and end-point). After one year, the Earth is located at the point where it started, so its displacement over the period of 1 year is zero.