Answer:Ok
Explanation:I understand that you are gving me free points
<span>So we want to know which statement is true for the body of mass m=2000kg that is lifted to a height of h=15m in t=15 s. Lets calculate each of the following: Gravity force on the body is F=m*g=2000*9.81=19620 N so a is FALSE. Potential energy of the body when it is lifted to the height of 15 m is Ep=m*g*h=2000*9.81*15=294300 J so b is FALSE. Work to lift the body is: W=Fg*h=2000*9.81*15= Ep=294300 J so c is FALSE. Power P=W/t=294300/15=19620 W So d is TRUE. </span>
Answer:
The period is
Explanation:
From the question we are told that
The frequency is
Generally the period is mathematically represented as
=>
=>
Missing question content is atteched.
Answer:
•
• Velocity of tightend is 2times greater than that of linesman while velocity of halfback is thrice that of linesman.
• The halfback and tightend have the greatest momentum.
Explanation:
We are given:
= 3m/s
Therefore, considering the fact the distance covered by the tightend is twice that of the linesman in same period of time, it means the speed of tightend is 2 times faster than the linesman, the velocity of the tight end will be:
= 2 * 3m/s = 6m/s
For the halfback:
The distance covered by the halfback is 3times that covered by the linesman in same period of time, it means the speed of the halfback is thrice greater than that of the linesman.
Therefore, the velocity of the half back will be:
= 3 * 3m/s = 9m/s
• To find momentum, we use:
P = m * v
Therefore,
Momentum for halfback:
= 60kg, v = 9m/s
= 60kg * 9m/s = 540kg.m/s
Momentum for tightend =
90kg * 6m/s = 540kg.m/s
Momentum for linesman=
120kg * 3m/s = 360kg.m/s
We can see that the tightend and halfback have the greatest momentum, with a momentum of 540kg.m/s. While the linesman has the lowest momentum, with a momentum of 360kg.m/s
Answer:
The compression in the spring is 9.64 meters.
Explanation:
Given that,
Mass of the train, m = 6251 kg
Speed of the train, v = 27 m/s
Spring constant of the spring, k = 48979 N/m
We need to find the compression in the spring when it comes to rest. It is a case of conservation of energy. The kinetic energy of the train is converted to elastic potential energy. So,
x is compression in spring
So, the compression in the spring is 9.64 meters.