If two equal weights of unequal volumes are balanced in
The two equal weights of unequal volumes which are balanced in
Two different bodies are completely immersed in water and undergo the same loss in weight. Is it necessary that their weights in
No, it is not necessary that their weights in
A body floats in kerosene of density 0.8 x 103 kg/m3 up to a certain mark. If the same body is placed in water of density 1.0 x 103 kg/m3, will it sink more or less ? Give
The body will sink less in water. This is because the density of water is more than that of kerosene due to which water will exert a greater upward buoyant force on the body.
Giving reasons state the reading on a spring balance when it is attached to a floating block of wood which weighs 50 g in
The reading on spring balance will be zero. This is because the weight of
If a fresh egg is put into a beaker filled with water, it sinks. On dissolving a lot of salt in the water, the egg begins to rise and then floats.
When a lot of salt is dissolved in water, then the density of salt solution becomes much more than pure water. Due to its much higher density, the salt solution exerts a greater upward buoyant force on the egg making it rise and then float.
Lakhmir Singh Physics Class 9 Solutions Page No:128
A beaker full of water is suspended from a spring balance. Will the reading of the balance change :
(a) if a cork is placed in
(b) if a piece of heavy metal is placed in
Give reasons for your answer.
The reading of spring balance will not change if a cork is placed in water because cork, being lighter than water, floats in water.
(b)The reading of spring balance will change if a piece of heavy metal is placed in
water because heavy metal being denser than water, sinks in water.
When a golf ball is lowered into a measuring cylinder containing water, the water level rises by 30 cm3 when the ball is completely submerged. If the mass of ball in
Volume of golf ball = rise in water level = 30 cm3
A boy gets into a floating boat.
a) The boat sinks a little more in water, that is, the boat floats lower in water.
b) The weight of water displaced (by the submerged part of the boat) increases.
c) The buoyant force acting on the boat increases.
The sheet of tin sinks in water because the density of tin is higher than that of water. When the same sheet of tin is converted into a box or a boat, then due to the trapping of
|1. What is the formula for gravitational force?
|2. How does the mass of an object affect the gravitational force acting on it?
|3. What is the difference between mass and weight?
|4. How does the distance between two objects affect the gravitational force between them?
|5. What is the significance of the gravitational constant (G) in the formula for gravitational force?