Answer:
The correct option is;
b. How high the barbell is being lifted
Explanation:
The work done in lifting the 160 N barbell is equal to the potential energy gained by the barbell in the final elevated position of the barbell
Therefore, in order to find the work done to lift the barbell, we can calculate the potential energy gained by the barbell when it is placed at height
The work done to lift the barbell = The potential energy, P.E., gained by the barbell
The potential energy of an object, P. E. = The mass of the object, m × The acceleration due to gravity, g × The height to which the barbell is lifted, h
∴ Mathematically, P.E. = m × g × h
Weight, W = Mass, m × The acceleration due to gravity, g
The weight, W of the barbell is given as W = 160 N
∴ W = m × g = 60 N
From which we have;
P.E. = m × g × h = W × h
∴ The work done to lift the barbell = P.E. = 60 N × h = 60 N × The height to which the barbell is lifted.
Therefore the information which need be known is the height to which the barbell.
Answer:
(b) 1/sinƟ
Explanation:
A simple machine can be defined as a type of machine with no moving parts but can be used to perform work.
Basically, a simple machine allows for the transformation of energy into work. The six simple machines are; lever, wedge, pulley, screw, wheel and axle, and inclined plane.
Inclined plane is a simple machine set at an angle and then used to lift an object.
In Physics, the velocity ratio of a simple machine is calculated as a ratio of the distance moved by the effort to the vertical distance through which a load is raised.
Mathematically, the velocity ratio of an inclined plane of angle Ɵ, acting as a simple machine is given by the formula;
Velocity ratio (V.R) = 1/sinƟ
Basically, an increase in the angle of inclination (measured in degrees) of an inclined plane increases its velocity ratio.
The basic steps are simple but careful
planning is needed. Sand dune restoration should be designed to create a dune that matches the
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speed up nature's work by using sand fences and dune
plants to collect sand more rapidly. Or in a different way, wind would bring more sand to create a dune. hope this helped, have an amazing day :)
1.) Transportation og goods and people
2.) Farming because of the rich minerls in its rivers
3.) The fertile soil near the river which helpes grow flax, wheat and papyrus.
Answer:
D. A record of all the physical activity you complete in one week.
Explanation:
A "Fitness Log" allows you to keep track of your workout or exercise. Therefore, it is <em><u>a record of the different workout you've managed to complete within a time frame</u></em>. It gives you several information such as the<em> type of workout you've completed, its duration and the time of the day it was performed</em>. This makes a person motivated to exercise because he can see his progress. He may also include <em>his mood before and after workout</em> in order to become more mindful in exercising and many other things.