Answer:
210,600πft-lb
Explanation:
Force is a function F(x) of position x then in moving from
x = a to x= b
Work done =
Consider a water tank conical in shape
we will make small horizontal section of the water at depth h and thickness dh and also assume radius at depth h is w
we will have ,
weight of slice under construction
weight = volume × density × gravitational constant
Now we can find work done
=
= 210,600πft-lb
On or near the surface of the Earth, 1 newton is the weight of about 102 grams of mass.
Note that the gravitational force between the object and the Earth is always the
same. It doesn't matter whether the object is falling, flying, floating, fluttering,
rising, sinking, rolling, sliding, or just laying there. It doesn't change.
Answer: option B. 45°
Explanation:
A body thrown at an angle from horizontal undergoes a projectile motion. The maximum horizontal displacement means the maximum range covered. The range is given by:
where v is the initial velocity, is angle of the projectile and g is the acceleration due to gravity.
For maximum range, sin 2θ = 1
2θ = sin⁻¹ 1 = 90°
θ = 90°/2 = 45°
Thus, the projectile undergoes maximum horizontal displacement at angle of 45°. Correct option is B.
Answer:
<h2>48,000 J</h2>
Explanation:
The kinetic energy of an object can be found by using the formula
m is the mass
v is the velocity
From the question we have
We have the final answer as
<h3>48,000 J</h3>
Hope this helps you