Answer:
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When describing how power and work are similar you would want to mention that a you must know time to determine both work and po
2 answers:
Answer:
You must know force in order determine both work and power.
Explanation:
Work done is defined as the product of the force and the displacement. Mathematically, it can be written as :
W = F × d
is the angle between the force and the displacement.
The power of an object is defined as the rate at which the work is done. It can be written as:
here w is the work done and t is the time taken.
So, in order to determine both power and the work the applied force must be a known quantity.
Hence, the correct option is (b) " you must know force in order determine both work and power ".
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The initial velocity of the ball is 1.01 m/s
Explanation:
The motion of the ball rolling off the desk is a projectile motion, which consists of two independent motions:
- A uniform horizontal motion with constant horizontal velocity
- A vertical accelerated motion with constant acceleration (, acceleration due to gravity)
We start by analyzing the vertical motion: we can find the time of flight of the ball by using the following suvat equation
where
s = 1.20 m is the vertical displacement (the height of the desk)
u = 0 is the initial vertical velocity
t is the time of flight
Solving for t,
Now we analyze the horizontal motion. We know that the ball covers a horizontal distance of
d = 0.50 m
in a time
t = 0.495 s
Therefore, since the horizontal velocity is constant, we can calculate it as
So, the ball rolls off the table at 1.01 m/s.
Learn more about projectile motion:
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