Answer:
(B) +18 cm
Explanation:
Given that the distance of the object is infinity.
And the image is formed at a distance of 18 cm, means .
Now as we know that the mirror formula is,
Now put the values of u and v
Therefore the focal length of the mirror is +18 cm.
Answer:
4N
Explanation:
Given parameters:
Weight of stone when immersed in water = 18N
Weight of water displaced = 4N
Unknown:
Weight of the stone in air = ?
Solution:
To solve this problem, we employ the Archimedes' principles.
It states that the upward buoyant force on a body is equal to the weight of the fluid displaced.
The weight of the water displaced is equal to the weight of the body.
So, the weight of the stone in air = 4N
A pure substance is a substance that contains only one type of atom or molecule. Homogeneous mixture is commonly referred to solution as there is uniform distribution all over the mixture while in a heterogeneous mixture consists of different phases or substances that are visible.
A compound is substance containing two or more elements that are chemically bound together. Therefore, coleslaw (a salad containing finely shredded cabbages and carrots and a creamy dressing) is a heterogeneous mixture.
Answer:
Velocity = v = 35 m/s
Explanation:
Kinetic energy of an object is defined as the energy possess by an object due to its motion. Kinetic energy K.E of an object is equal to the half of the mass of that object multiplied by square of the object's velocity.
Mathematically,
v = 35 m/s
Answer:
When a force acts on an object over a distance, it is said to have done work on the object. Physically, the work done on an object is the change in kinetic energy that that object experiences.
Explanation:
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