b. False
Answer:
false
Explanation:
i chose false when i was taking my practice exam
The correct answer of this question is: Work = Force . Distance
EXPLANATION:
The work is said to be done by a body if the force applied on the body has a component along the direction of displacement.
Let us consider a body of mass m.
The body is acted upon by a constant force F . Due to this force, the body undergoes a displacement of S .
Let is the angle between force and displacement.
Hence, the component of force along the direction of displacement is .
The work done by that body is calculated as -
Work done W =
=
= [ ∵
Let .
Hence, work done W = FScos0
= FS [ cos0 = 1]
Hence, the relation between work, force and distance can be written as -
Work = force . distance
b. The Earth's surface receives less energy from the sun's rays.
c. The Earth's rotation transfers energy more evenly.
d. The Earth's atmosphere traps heat.
Answer: 79.3 m/s
Explanation: Use the equation V^2-Vo^2=2a(ΔY)
We know that the initial velocity is 1.99 m/s, so that is our Vo. We also are given that the height of the deck is 321, so therefore, our delta y is 321. Finally, our acceleration is 9.81 m/s^2 since that is the acceleration of gravity during free fall. We are solving for the final velocity (V)
So, our equation is V^2-(1.99^2)=2(9.8)(321)
Next, V^2-(3.96)=6291.6
V^2=6295.56
Take the square root of both sides, and V=79.3 m/s
Answer:79.3 m/s
Explanation: