Suchita makes a table to identify the variables used in the equations for centripetal force.
2 answers:
Answer : The correct option is, X : radius and Y : tangential speed
Explanation :
Centripetal force : It is defined as a force which acts on the object to keep the object moving along a circular path.
Formula for centripetal force :
where,
= centripetal force
m = mass
r = radius
V = tangential speed
The quantity belong in cell X is radius and in the cell Y is tangential speed
Hence, the correct option is, X : radius and Y : tangential speed
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Answer:
5 x 10⁻⁷N
Explanation:
Given parameters:
Mass of object 1 = 100kg
Mass of object 2 = 300kg
Distance = 2m
Unknown:
Force of gravitational attraction between the objects = ?
Solution:
Newton's law of universal gravitation states that the gravitational force between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
From Newton's law of universal gravitation we derive an expression:
Fg =
G is the universal gravitation constant = 6.67 x 10⁻¹¹
m is the mass
r is the distance between the bodies
Now insert the parameters and solve;
Fg = 6.67 x 10⁻¹¹ x = 5 x 10⁻⁷N
Answer:
14523.55J
Explanation:
The work done by the jogger against gravity is given by the following equation;
where m is the mass, g is acceleration due to gravity taken as and h is the height of the hill.
Since the length of the hill is 132m and it is inclined at 12 degrees to the horizontal, the height is thus given as follows;
Substituting this into equation (1) with all other necessary parameters, we obtain the following;