Explanation :
First considering Sid's statements, the description of tangential speed and centripetal acceleration are correct.
But for Centripetal force, the description is incorrect because centripetal force is always perpendicular to the velocity.
Sid's error can be corrected by the statement (b) i.e. "Centripetal force is perpendicular to the velocity of the satellite".
Answer:
Explanation:
For convenience, let's represent the thermal expansion coefficient by , i.e. .
Given that, for steel °,
initial length, , initial temperature, °, and the final temperature, °.
Let the length of the rod at ° be .
Now, change in length,
Hence, the length of the rod at ° be .
use of crowbar
It is used as a lever either to force apart two objects or to remove nails. Crowbars are commonly used to open nailed wooden crates. Common uses for larger crowbars are: removing nails, prying apart boards, and generally breaking things.
use of wheel barrow
Wheelbarrows are used for a variety of things, such as moving rock, mulch or compost to the garden, moving trees or large shrubs from one spot to another, hauling bricks, disposing of garden debris, or even for mixing concrete or fertilizers.
initial speed of 226000 m/s
acceleration of 4.0 x 1014 m/s2,
speed of 781000 m/s
What is Acceleration?
- Acceleration is a rate of change of velocity with respect to time with respect to direction and speed.
- A point or an object moving in a straight line is accelerated if it speeds up or slows down.
- Acceleration formula can be written as,
a = (v - u ) / t m/s²
As we have to find the time taken, the formula can be altered as,
where, t - time taken to reach a final speed
v - final velocity
u - initial velocity
a - acceleration.
Substituting all the given values,
= 1.3875 × 10⁻⁹ seconds.
So, taken to reach the final speed is found to be 1.3 × 10⁻⁹ 8iH..
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Answer:
Explanation:
We want to find the initial speed of the ball.
To do this, we have to apply the formula for the time of flight of a projectile:
where θ = angle of flight
g = acceleration due to gravity
v0 = initial speed
Therefore, substituting the given values into the formula, we have that:
⇒ 2 × ×0.8910= 9.8 × 4.2
⇒
That is the initial speed of the ball.
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