Disadvantages
1. They are very expensive
2. They have lower e.m.f per cell.
Moraa orina answered the question on April 5, 2018 at 07:23
-
A battery is rated at 30 Ah. For how long will it work if it steadily supplies a current of 3 A?
(Solved)
A battery is rated at 30 Ah. For how long will it work if it steadily supplies a current of 3 A?
Date posted:
April 5, 2018
.
Answers (1)
-
The length of a pinhole camera is 25.0 cm. An object 2.0 cm is placed 10.0 m from the
pinhole. Calculate the height of the...
(Solved)
The length of a pinhole camera is 25.0 cm. An object 2.0 cm is placed 10.0 m from the
pinhole. Calculate the height of the image produced and its magnification
Date posted:
April 5, 2018
.
Answers (1)
-
Calculate the height of a building 300 m away from a pinhole camera which produces
an image 2.5 cm high if the distance between the...
(Solved)
Calculate the height of a building 300 m away from a pinhole camera which produces
an image 2.5 cm high if the distance between the pinhole and the screen is 5.0 cm.
Date posted:
April 5, 2018
.
Answers (1)
-
List four applications of radiation
(Solved)
List four applications of radiation.
Date posted:
April 5, 2018
.
Answers (1)
-
State the applications of conductors
(Solved)
State the applications of conductors
Date posted:
April 5, 2018
.
Answers (1)
-
Starting a car with 12 volts battery is better than 12 dry cells in series.Explain
(Solved)
Starting a car with 12 volts battery is better than 12 dry cells in series.Explain
Date posted:
April 5, 2018
.
Answers (1)
-
The master cylinder piston in a car braking system has a diameter of 2.0 cm. The
effective area of the brake pads on each of...
(Solved)
The master cylinder piston in a car braking system has a diameter of 2.0 cm. The
effective area of the brake pads on each of the four wheels is 30 cm2
. The driver
exerts a force of 500 n on the brake pedal. Calculate
a) The pressure in the master cylinder
b) The total braking force in the car.
Date posted:
April 4, 2018
.
Answers (1)
-
The area of the smaller piston of a hydraulic press is 0.01 m2 and that of the bigger piston is 0.5 m2. If the force...
(Solved)
The area of the smaller piston of a hydraulic press is 0.01 m2
and that of the bigger
piston is 0.5 m. If the force applied to the smaller piston is 2 N, what force is
transmitted to the larger piston?
Date posted:
April 4, 2018
.
Answers (1)
-
Explain how a hydraulic press works
(Solved)
Explain how a hydraulic press works
Date posted:
April 4, 2018
.
Answers (1)
-
Describe how a hydraulic brake system works
(Solved)
Describe how a hydraulic brake system works
Date posted:
April 4, 2018
.
Answers (1)
-
Explain the applications of pressure in gases and liquids
(Solved)
Explain the applications of pressure in gases and liquids
Date posted:
April 4, 2018
.
Answers (1)
-
The height of the mercury column in a barometer is found to be 67.0 cm at a certain place.
What would be the height of...
(Solved)
The height of the mercury column in a barometer is found to be 67.0 cm at a certain place.
What would be the height of a water barometer at the same place? (densities of mercury-
1.36 × 104
kg/m3
and water- 1.0 × 103
kg/m3
).
Date posted:
April 4, 2018
.
Answers (1)
-
The density of mercury is 13,600 kgm-3
. Determine the liquid pressure at a point 76 cm
below the surface of mercury. (Take g = 10...
(Solved)
The density of mercury is 13,600 kgm-3
. Determine the liquid pressure at a point 76 cm
below the surface of mercury. (Take g = 10 Nkg-1
)
S
Date posted:
April 4, 2018
.
Answers (1)
-
A diver is 10 m below the surface of water in a dam. If the density of water is 1,000 kgm-3
, determine the pressure due...
(Solved)
A diver is 10 m below the surface of water in a dam. If the density of water is 1,000 kgm-3
, determine the pressure due to the water on the diver. (Take g = 10 Nkg-1
)
Date posted:
April 4, 2018
.
Answers (1)
-
A man of mass 84 kg stands upright on a floor. If the area of contact of his shoes and
the floor is 420 cm2
,...
(Solved)
A man of mass 84 kg stands upright on a floor. If the area of contact of his shoes and
the floor is 420 cm2
, determine the average pressure he exerts on the floor. (Take g =
10 N/Kg)
Date posted:
April 4, 2018
.
Answers (1)
-
Differentiate between scalar and vector quantity giving examples
(Solved)
Differentiate between scalar and vector quantity giving examples
Date posted:
April 3, 2018
.
Answers (1)
-
Explain the differences between mass and weight
(Solved)
Explain the differences between mass and weight
Date posted:
April 3, 2018
.
Answers (1)
-
An astronaut weighs 900 N on earth. On the moon he weighs 150 N. Calculate the moons’
gravitational strength. (Take g = 10 N/kg)
(Solved)
An astronaut weighs 900 N on earth. On the moon he weighs 150 N. Calculate the moons’
gravitational strength. (Take g = 10 N/kg)
Date posted:
April 3, 2018
.
Answers (1)
-
What is induction? What is earthing?
(Solved)
What is induction?
What is earthing?
Date posted:
April 3, 2018
.
Answers (1)
-
100 cm3
of fresh water of density 1,000 kgm-3
is mixed with 100 cm3
of sea water of density
1030 kgm-3
. Calculate the density of the mixture
(Solved)
100 cm3
of fresh water of density 1,000 kgm-3
is mixed with 100 cm3
of sea water of density
1030 kgm-3
. Calculate the density of the mixture
Date posted:
April 3, 2018
.
Answers (1)