Answer:
It is a technique called water displacement method
Mass of an irregular object can be measured using a physical balance
Explanation:
- It consists of a calibrated glass cylinder containing water.
- The initial level of water column is noted
- The irregular object is submerged into it. The water level rises.
- The level of the water column is noted.
- The difference between the final and initial level of the water column gives the volume of the irregular object.
- The method used to find the volume of irregular shaped object is called the water displacement method.
There is no change in the weight of either
Air has no influence on the weight of an object unless the object is accelerating down through an air column. The air resistance to the free fall of the object may have an influence on its instantaneous weight of the object.
Explanation:
The weight of an object is influenced by the mass of the object and gravity. Gravity also has influence in a vacuum. Therefore the wooden and iron piece will weight the same in a vacuum as in the air.
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So we want to know how long should we make the simple pendulum so it's period is T=200 ms = 0.2 s. Since the formula for simple pendulum is T=2*pi*sqrt(L/g) where T is the period, L is the length and g=9.81 m/s^2. Now we need to invert the formula to get the length: T/2pi=sqrt(L/g), we square both sides of the equation: (T/2pi)^2=L/g and multiply both sides with g:
g*(T/2pi)^2=L. Now we input the numbers and get that the length L= 0.00995m.
Answer: None of the options
Explanation:
When we talk about uniform circular motion (constant speed) we yet have a changing velocity and therefore, acceleration.
How is this possible?
Well, velocity is a vector, and as a vector it has magnitude (the speed) and direction. So, while an object performs a uniform circular motion, althought its speed is not changing, its direction does change.
And, since acceleration is the variation of velocity in time , certainly there is acceleration here.
On the other hand, Inertia is mathematically expressed as:
This means that for a system with a given axis of rotation and a given total mass , the greater the distance from the axis to the object that performs the circular motion, the greater the inertia.
This also means that inertia depends directly on the mass of the system and the radius of the circular motion, therefore, as long as these elements exist, in a circular motion the inertia will always be different from zero.
It takes 29.5 days for a new moon to occur approximately after a full moon.