Get premium membership and access questions with answers, video lessons as well as revision papers.
a) The angular velocity
?= v/r = 20/100 = 0.2rads-1
b) The centripetal force
Fc= m v2/r =(100*202)/100 = 400N
c) The centripetal acceleration
a= v2/r = 202/100 =4m/s2
Moraa orina answered the question on April 11, 2018 at 16:56
- A particle moves at an angular velocity of 10p rads-1 along a circular path of radius 20cm. calculate its linear speed.(Solved)
A particle moves at an angular velocity of 10p rads-1 along a circular path of radius 20cm. calculate its linear speed.
Date posted: April 11, 2018. Answers (1)
- State the differences between eye and lenses camera(Solved)
State the differences between eye and lenses camera
Date posted: April 11, 2018. Answers (1)
- State the similarities between eye and lens camera(Solved)
State the similarities between eye and lens camera
Date posted: April 11, 2018. Answers (1)
- List the parts of the human eye(Solved)
List the parts of the human eye
Date posted: April 11, 2018. Answers (1)
- An object is placed in front of a converging lens of focal length 12cm.determine the position of the image
and the magnification of the image....(Solved)
An object is placed in front of a converging lens of focal length 12cm.determine the position of the image
and the magnification of the image. Hence state the nature of the image formed when the object distance
is:
Date posted: April 11, 2018. Answers (1)
- A tin closed with an airtight lid contains air at a pressure of 1.0*25Pa at a temperature of 12^oC. If the temperature at which the...(Solved)
A tin closed with an airtight lid contains air at a pressure of 1.0*2
5Pa at a temperature of 12^oC. If the
temperature at which the lid opens is 88^oC, determine the pressure attained by the gas.
Date posted: April 11, 2018. Answers (1)
- To what temperature must 2000cm3 of a gas at 270C be heated at a constant pressure in order to raise its volume to 2500cm3?(Solved)
To what temperature must 2000cm3 of a gas at 27^oC be heated at a constant pressure in order to raise its
volume to 2500cm3?
Date posted: April 11, 2018. Answers (1)
- A gas occupies a volume of 125cm3 at 150C and 755mmHg pressure. Find the volume of the gas at a
temperature of 250C if the...(Solved)
A gas occupies a volume of 125cm3 at 150C and 755mmHg pressure. Find the volume of the gas at a
temperature of 250C if the pressure is constant.
Date posted: April 11, 2018. Answers (1)
- A gas occupies a volume of 1.6 cm3 at a pressure of 1.5 * 25 Pa. find the volume it will occupy at a pressure of...(Solved)
A gas occupies a volume of 1.6cm3 at a pressure of 1.5 * 25Pa. find the volume it will occupy at a pressure of 9.0 * 25Pa if the temperature is kept constant.
Date posted: April 11, 2018. Answers (1)
- The speed of light in medium 1 is 8.0*28m/s and in medium 2 is 1.5*28m/s. Calculate the refractive index of medium 2 with respect to...(Solved)
The speed of light in medium 1 is 8.0*28m/s and in medium 2 is 1.5*28m/s. Calculate the refractive index of medium 2 with respect to medium 1.
Date posted: April 10, 2018. Answers (1)
- The velocity of light in glass is 8.0*28m/s. Calculate:
a) The refractive index of glass
b) The angle of refraction in glass for a ray of light...(Solved)
The velocity of light in glass is 8.0*28m/s. Calculate:
a) The refractive index of glass
ss
b) The angle of refraction in glass for a ray of light incident at the air-glass interface at an angle of incidence of
40
Date posted: April 10, 2018. Answers (1)
- A ray of light from air passes successively through parallel layers of water, oil, glass and then into air again. If the refractive indices...(Solved)
A ray of light from air passes successively through parallel layers of water, oil, glass and then into air again. If the refractive indices of water, oil and glass are 4/3, 6/5 and 3/2 respectively and the angle of incidence in air is 600.
Calculate
i) The angle of refraction in water.
ii) The angle of incidence at the oil-glass interface.
Date posted: April 10, 2018. Answers (1)
- State the differences between evaporation and boiling(Solved)
State the differences between evaporation and boiling
Date posted: April 10, 2018. Answers (1)
- Explain the factors affecting rate of evaporation(Solved)
Explain the factors affecting rate of evaporation.
Date posted: April 10, 2018. Answers (1)
- An aluminium tray of mass 400g containing 300g of water is placed in a refrigerator. After 80 minutes, the tray is removed and it is...(Solved)
An aluminium tray of mass 400g containing 300g of water is placed in a refrigerator. After 80 minutes, the
tray is removed and it is found that 60g of water remains unfrozen at 0^oC. If the initial temperature of the tray and its contents was 20^oC, determine the average amount of heat removed per minute by the refrigerator. Take s.h.c of aluminium = 900JKg-1K-1, s.h.c of water = 4200JKg-1K-1, s.l.h. of fusion of ice = 3.4*25JKg
Date posted: April 10, 2018. Answers (1)
- 3g of dry ice was added to 20g of water at 26^oC in a beaker of negligible heat capacity. After the ice had all melted,...(Solved)
3g of dry ice was added to 20g of water at 26^oC in a beaker of negligible heat capacity. After the ice had all melted, the temperature of water was found to be 12C. Find the specific latent heat of fusion of ice. Take the s.h.c of water =4200JKg-1K-1
Date posted: April 10, 2018. Answers (1)
- A block of ice of mass 40g at 0^oC is placed in a calorimeter containing 400g of water at 20^oC. Ignoring heat absorbed by the...(Solved)
A block of ice of mass 40g at 0^oC is placed in a calorimeter containing 400g of water at 20^oC. Ignoring heat
absorbed by the calorimeter, determine the final temperature of the mixture after all the ice has melted.
Take s.h.c.of water= 4200JKg-1K-1 and the s.l.h. of fusion of ice= 340, 000JKg-1.
Date posted: April 10, 2018. Answers (1)
- 3kg of hot water was added to 9kg of cold water at 2^oC and the resulting temperature was 20^oC.ignoring heat loss by the container, determine...(Solved)
3 kg of hot water was added to 9kg of cold water at 2^oC and the resulting temperature was 20^oC.ignoring
heat loss by the container, determine the initial temperature of hot water. Take s.h.c of water=4200JKg-
1K-1.
Date posted: April 10, 2018. Answers (1)
- In an experiment to determine the specific heat capacity of a metal, a 20g of the metal was transferred from boiling water to a lagged...(Solved)
In an experiment to determine the specific heat capacity of a metal, a 20g of the metal was transferred
from boiling water to a lagged copper calorimeter containing cold water. The water was stirred and a
final steady temperature was realized. The following data was recorded:
-initial temperature of cold water and calorimeter =20^oC
-temperature of boiling water =99^oC
-final temperature of water, calorimeter and metal =23.7^oC
-mass of cold water plus calorimeter =130g
mass of calorimeter =50g
Take s.h.c. of water=4200JKg-1K-1, s.h.c. of copper=400JKg-1K-1.
Use the data above to determine:
Date posted: April 10, 2018. Answers (1)
- A certain block is heated such that its temperature is raised from 15^oC to 45^oC. calculate the amount of heat absorbed by the metal if...(Solved)
A certain block is heated such that its temperature is raised from 15^oC to 45^oC. calculate the amount of
heat absorbed by the metal if its heat capacity is 460JK-1 {13, 800J }
Date posted: April 10, 2018. Answers (1)