Answer:
The solution is attached in the pictures below
Explanation:
A diet decreases a person's mass by 6 %. Exercise creates muscle and reduces fat, thus increasing the person's density by 1 %. D
1 answer:
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Answer:
No
Explanation:
The force of tension exerted by the string on the rock acts as centripetal force, so its direction is always towards the centre of the circle.
However, the direction of motion of the rock is always tangential to the circle: this means that the force is always perpendicular to the direction of motion of the rock.
As we know, the work done by a force on an object is
where
F is the magnitude of the force
d is the displacement of the object
is the angle between the force and the displacement
In this situation, F and d are perpendicular, so , therefore
and the work done is zero:
Answer: 81.619 kJ
Explanation:
Given
Mass of roller coaster is
It reaches the steepest hill with speed of
Hill to bottom is 51 m long with inclination of
Height of the hill is
Conserving energy to get kinetic energy at bottom
Energy at top=Energy at bottom