Get premium membership and access questions with answers, video lessons as well as revision papers.
a) The tension in the string when the bob is at the top part of the circle
T=mv2/r –mg= mr?2-mg=mr(2p/f)2-mg
= (1*1*4*p2/22)-(1*10)
= 147.95N
b) Tension when it is at the bottom
T= mr(2p/f)2+mg
= (1*1*4*p2/22) + (1*10)
= 167.95N
c) At what position is the string likely to break? Why?
At the bottom of the circle. The string experiences maximum tension at this point.
d) What is the minimum speed required to maintain the string under tension.
V=(rg)1/2=(1*10)1/2= 3.162m/s
Moraa orina answered the question on April 11, 2018 at 17:08
- An object of mass 0.4kg is rotated by a string at a constant speed, v in a vertical circle of radius 1m. If the
minimum...(Solved)
An object of mass 0.4kg is rotated by a string at a constant speed, v in a vertical circle of radius 1m. If the
minimum tension in the string is 3N, calculate :
a) The speed, v
b) Maximum tension in the string
c) The tension when the string is just horizontal
Date posted: April 11, 2018. Answers (1)
- An object of mass 8kg is whirled round rapidly in a vertical circle of radius 2m with a constant speed of
6m/s. Calculate the maximum...(Solved)
An object of mass 8kg is whirled round rapidly in a vertical circle of radius 2m with a constant speed of
6m/s. Calculate the maximum and minimum tension in the string. Take g=10N/kg
Date posted: April 11, 2018. Answers (1)
- A stone of mass 0.6kg attached to a string of length 0.5m is whirled in a horizontal circle at a constant speed. If the maximum...(Solved)
A stone of mass 0.6kg attached to a string of length 0.5m is whirled in a horizontal circle at a constant
speed. If the maximum tension in the string is 5N before it breaks, calculate:
a) The maximum speed of the stone
b) The maximum number of revolutions per second it can make
Date posted: April 11, 2018. Answers (1)
- A stone of mass 2kg is whirled in a horizontal circle of radius 0.5m. The tension in the string was found to
be 64N. Determine...(Solved)
A stone of mass 2kg is whirled in a horizontal circle of radius 0.5m. The tension in the string was found to
be 64N. Determine the velocity of the stone in the circle.
Date posted: April 11, 2018. Answers (1)
- Calculate the period and frequency of a particle in a circular path moving at an angular velocity of 4p
rads-1.(Solved)
Calculate the period and frequency of a particle in a circular path moving at an angular velocity of 4π
rads-1.
Date posted: April 11, 2018. Answers (1)
- A car of mass 100kg moves round a circular track of radius 100m with a linear speed of 20m/s. calculate:a) The angular velocityb) The centripetal...(Solved)
A car of mass 100kg moves round a circular track of radius 100m with a linear speed of 20m/s. calculate:
a) The angular velocity
b) The centripetal force
c) The centripetal acceleration
Date posted: April 11, 2018. Answers (1)
- 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)