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Solid copper is denser than water hence the solid sphere sinks, weight is greater than upthrust. Hollow sphere experiences an upthrust equal ti its weight so it will float/density of hollow sphere is less than that of water i.e. volume of water displaced is a lot more than the weight of the sphere.
johnmulu answered the question on February 18, 2017 at 09:36
- When a bus goes a round bend on a flat road, it experiences a centripetal force, State what provides the centripetal force and the purpose of banking roads at bends. (Solved)
a) When a bus goes a round bend on a flat road, it experiences a centripetal force. State what provides the centripetal force
b) State the purpose of banking roads at bends.
Date posted: February 18, 2017. Answers (1)
- Explain applications of uniform circular motion in daily life. (Solved)
Explain applications of uniform circular motion in daily life.
Date posted: February 18, 2017. Answers (1)
- State two ways in which the centripetal force on a body can be increased.(Solved)
State two ways in which the centripetal force on a body can be increased.
Date posted: February 18, 2017. Answers (1)
- Define the term angular velocity(Solved)
Define the term angular velocity
Date posted: February 18, 2017. Answers (1)
- A body mass 0.50 kg is attached to the end of a string of length 50 cm and Whirled in a horizontal circle. If the tension in the string is 81N, Determine the velocity of the body. (Solved)
A body mass 0.50 kg is attached to the end of a string of length 50 cm and Whirled in a horizontal circle. If the tension in the string is 81N, Determine the velocity of the body.
Date posted: February 18, 2017. Answers (1)
- A car of mass 1200 kg is moving with a velocity of 25ms-1 around a flat bend of radius 150m. Determine the minimum frictional force between the tyres and the road that will prevent the car from sliding off(Solved)
A car of mass 1200 kg is moving with a velocity of 25ms-1 around a flat bend of radius 150m. Determine the minimum frictional force between...
Date posted: February 18, 2017. Answers (1)
- Explain why a pail of water can be swung in vertical circle without the water pouring out.(Solved)
Explain why a pail of water can be swung in vertical circle without the water pouring out.
Date posted: February 18, 2017. Answers (1)
- State the meaning of the term “Principal focus” as applied in lenses(Solved)
The term principal focus is used in lenses. What does it mean?
Date posted: February 18, 2017. Answers (1)
- Define the term accommodation as applied to human eye(Solved)
What is meant by the term accommodation with reference to the eye?
Date posted: February 18, 2017. Answers (1)
- An illuminated vertical object is initially placed on the principle axis of a converging lens and 32 cm from it(Solved)
An illuminated vertical object is initially placed on the principle axis of a converging lens and 32 cm from it. The focal length of the lens is 15 cm. The object is now placed at a point 12 cm from the lens and on the same side. State two changes other than magnification that are observed on the image formed due to this change.
Date posted: February 18, 2017. Answers (1)
- An object placed in front of a convex lens of focal length 10 cm produces an image at a distance of 15 cm from the lens and on the same side as the object. (Solved)
An object placed in front of a convex lens of focal length 10 cm produces an image at a distance of 15 cm from the lens and on the same side as the object. Determine the position of the object.
Date posted: February 18, 2017. Answers (1)
- The pressure of the air inside a car tyre increases if the car stands out in the sun for some time on a hot day. Explain the pressure increase in terms of the kinetic theory of gases.
(Solved)
The pressure of the air inside a car tyre increases if the car stands out in the sun for some time on a hot day. Explain the pressure increase in terms of the kinetic theory of gases.
Date posted: February 18, 2017. Answers (1)
- A long horizontal capillary tube of uniform bore sealed at one end contains dry air trapped by a drop of mercury. The length of the air column is 142 mm at 17oC.(Solved)
A long horizontal capillary tube of uniform bore sealed at one end contains dry air trapped by a drop of mercury. The length of the air column is 142 mm at 17oC. Determine the length of the air column at 25oC.
Date posted: February 18, 2017. Answers (1)
- In verifying the pressure law of gases, the temperature and pressure of a gas are varied at constant volume.(Solved)
In verifying the pressure law of gases, the temperature and pressure of a gas are varied at constant volume. State the condition necessary for the law to hold.
Date posted: February 18, 2017. Answers (1)
- When the temperature of a gas in a closed container is raised, the pressure of the gas increases. Explain how the molecules of the gas cause the increase in pressure(Solved)
When the temperature of a gas in a closed container is raised, the pressure of the gas increases..
Date posted: February 18, 2017. Answers (1)
- What is meant by absolute zero temperature?(Solved)
Define what is absolute zero temperature.
Date posted: February 18, 2017. Answers (1)
- What is meant by an ideal gas?(Solved)
State what is meant by an ideal gas.
Date posted: February 18, 2017. Answers (1)
- A balloon is filled with air to volume of 200 ml at a temperature of 293 K. Determine the volume when the temperature rises to 353K at the same pressure.(Solved)
A balloon is filled with air to volume of 200 ml at a temperature of 293 K. Determine the volume when the temperature rises to 353K at the same pressure.
Date posted: February 18, 2017. Answers (1)
- State the law that relates the volume of a gas to the temperature of a gas.
(Solved)
Define the law that relates the volume of a gas to the temperature of a gas.
Date posted: February 18, 2017. Answers (1)
- When an inflated balloon is placed in a refrigerator it is noted that its volume reduces.(Solved)
When an inflated balloon is placed in a refrigerator it is noted that its volume reduces. Use the kinetic theory of gases to explain this observation
Date posted: February 18, 2017. Answers (1)