Volume = 7.4 cm3 - 4.6 cm 3 = 2.8 cm3
Density = $\frac{mass}{volume}=\; \frac{11g}{2.8cm^2.8cm^3}\; =3.9gcm^{-3}$
johnmulu answered the question on April 13, 2017 at 06:37
-
In an X-ray tube it is observed that the intensity of X-rays increases when potential difference across the filament is increased.
(Solved)
In an X-ray tube it is observed that the intensity of X-rays increases when potential difference across the filament is increased. Explain this observation
Date posted:
February 20, 2017
.
Answers (1)
-
State the differences between hard X-ray and soft X-rays
(Solved)
State the differences between hard X-ray and soft X-rays.
Date posted:
February 20, 2017
.
Answers (1)
-
State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced.
(Solved)
State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced.
Date posted:
February 20, 2017
.
Answers (1)
-
Name two differences between cathode rays and electromagnetic radiations.
(Solved)
Name two differences between cathode rays and electromagnetic radiations.
Date posted:
February 20, 2017
.
Answers (1)
-
State two differences between the cathode ray tube (CRT) of a T.V. and the cathode ray oscilloscope (CRO).
(Solved)
State two differences between the cathode ray tube (CRT) of a T.V. and the cathode ray oscilloscope (CRO).
Date posted:
February 20, 2017
.
Answers (1)
-
A block of glass of mass 250 g floats in mercury. What volume of glass lies under the surface of the mercury? (Density of mercury is 13.6 x 103Kgm-3)
(Solved)
A block of glass of mass 250 g floats in mercury. What volume of glass lies under the surface of the mercury? (Density of mercury is 13.6 x 103Kgm-3)
Date posted:
February 18, 2017
.
Answers (1)
-
A block of wood weighing 2.0 N is held under water by a string attached to the bottom of a container. The tension in the string is 0.5 N
(Solved)
A block of wood weighing 2.0 N is held under water by a string attached to the bottom of a container. The tension in the string is 0.5 N. Determine the density of the wood.
Date posted:
February 18, 2017
.
Answers (1)
-
A solid copper sphere will sink in water while a hollow copper sphere of the same mass may float.
(Solved)
A solid copper sphere will sink in water while a hollow copper sphere of the same mass may float. Explain this observation.
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)
-
State why it is necessary to leave an air space in a closed glass bottle of water when it is to be kept in a refrigerator
(Solved)
State why it is necessary to leave an air space in a closed glass bottle of water when it is to be kept in a refrigerator.
Date posted:
February 18, 2017
.
Answers (1)
-
State two factors that affect the boiling point of a liquid.
(Solved)
Name two factors that affect the boiling point of a liquid.
Date posted:
February 18, 2017
.
Answers (1)
-
Water is known to boil at 100oC. A student heated some water and noticed that it boiled at 101oC. State two possible reasons for this observation.
(Solved)
Water is known to boil at 100oC. A student heated some water and noticed that it boiled at 101oC. State two possible reasons for this observation.
Date posted:
February 18, 2017
.
Answers (1)
-
Explain why a drop of methylated spirit on the back of the hand feels colder than a drop of water at the same temperature.
(Solved)
Explain why a drop of methylated spirit on the back of the hand feels colder than a drop of water at the same temperature.
Date posted:
February 15, 2017
.
Answers (1)
-
Water of mass 3 kg, at a temperature of 90oC is allowed to cool for 10 minutes. state two factors that determine the final temperature.
(Solved)
Water of mass 3 kg, at a temperature of 90oC is allowed to cool for 10 minutes. State two factors, other than humidity, that determine the final temperature.
Date posted:
February 15, 2017
.
Answers (1)
-
A heating coil is rated 100 W, 240 V. At what rate would it dissipate energy it is connected to a 220 V supply
(Solved)
A heating coil is rated 100 W, 240 V. At what rate would it dissipate energy it is connected to a 220 V supply
Date posted:
February 15, 2017
.
Answers (1)
-
An electric bulb with a filament of resistance 480 ohms is connected to a 240 V mains supply. Determine the energy dissipated in 2 minutes
(Solved)
An electric bulb with a filament of resistance 480 ohms is connected to a 240 V mains supply. Determine the energy dissipated in 2 minutes
Date posted:
February 15, 2017
.
Answers (1)
-
An electric heater rated 240 V, 3000 W is to be connected to a 240 V mains supply, through a 10 A fuse.Determine whether the fuse is suitable or not
(Solved)
An electric heater rated 240 V, 3000 W is to be connected to a 240 V mains supply, through a 10 A fuse. Determine whether the fuse is suitable or not
Date posted:
February 15, 2017
.
Answers (1)
-
State three factors that affect the capacitance of a parallel plate capacitor
(Solved)
State three factors that affect the capacitance of a parallel plate capacitor
Date posted:
February 15, 2017
.
Answers (1)
-
In an experiment using a ripple tank the frequency, f, of the electric pulse generator was reduced to one third of its value
(Solved)
In an experiment using a ripple tank the frequency, f, of the electric pulse generator was reduced to one third of its value. How does the new wavelength compare with the initial wavelength? Explain your answer.
Date posted:
February 14, 2017
.
Answers (1)