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Naireet Bagchi
Subject: Physics
, asked on 15/11/17
A boy walks a distance 30m in 1 minute and another 30m in 15 minute. Describe the type of motion of the boy and find his average speed in m s-1.
Answer
3
Naireet Bagchi
Subject: Physics
, asked on 15/11/17
Please tell me the method.
QC. Numericals
1. A car covers a distance of 160 km between two cities in 4 h. What is the average speed of the car ?
Ans : 40 km h
–1
2. A train travels a distance of 300 km with an average speed of 60 km h
–1
. How much time does it take to cover the distance ?
Ans : 5 h
3. A boy travels with an average speed of 10 m
–1
for 20 min. How much distance does he travel ?
Ans : 12 km
4. A boy walks a distance 30 m in 1 minute and another 30 m in 1.5 minute. Describe the type of motion of the boy and find his average speed in m s
–1
. Ans : non-uniform. 0-4 m s
–1
Answer
6
Deepa
Subject: Physics
, asked on 28/10/17
how does migration support transnational corporations?
Answer
1
Deepa
Subject: Physics
, asked on 10/9/17
why there is low pressure at high altitude
Answer
3
Deepa
Subject: Physics
, asked on 10/9/17
why does water come out of a downstairs tap faster than an upstairs
Answer
4
Deepa
Subject: Physics
, asked on 8/9/17
How does the density of a liquid change with the rise in temperature?
Answer
1
Deepa
Subject: Physics
, asked on 8/9/17
State the relation between Volume and Density.
Answer
1
Deepa
Subject: Physics
, asked on 8/9/17
Two solids A and B of densit y25 g/cm3 and 0.80 g/cm3 are placed in a liquid L of density 1.2 g/cm3. Which solids is likely to float and why?
Answer
1
Deepa
Subject: Physics
, asked on 8/9/17
33. Why does an iron needle sink in water, but an iron ship float in water?
Answer
1
Deepa
Subject: Physics
, asked on 8/9/17
32. Why do the bodies like cork and wood float in water? [2]
Answer
1
Deepa
Subject: Physics
, asked on 8/9/17
Q.55. Label the parts of the aerosol and explain the working.
Answer
1
Deepa
Subject: Physics
, asked on 8/9/17
What has the greater density, a cube of water measuring 1cmX1cmX1cm and having a mass of 1g,
or a block of plastic measuring 2cmX3cmX1cm with a mass of 4g?Convert the value of the density
into kg/m³.
Answer
1
Deepa
Subject: Physics
, asked on 8/9/17
What is the density of a block of wood measuring 0.9cmX2cmX6cm with a mass of 5.4g.Convert the
value of the density into kg/m³.
Answer
1
Deepa
Subject: Physics
, asked on 8/9/17
Water has a density of approximately 1g/cm3. In fact 1cm3 of water used to be the standard for a gram.
Objects will sink if their density is greater that water and will float if their density is less. For the following
problems, decide if the block will sink or float.
a. A cube measuring 2cm on each side weights 5g, will it sink or float?
b. A block has a mass of 20g and measures 2cmX4cmX2cm, will it sink or float?
c. A hollow iron cube has measures 5cm on each side and has a mass of 20g. Will the iron cube sink or float?
Answer
1
Deepa
Subject: Physics
, asked on 8/9/17
An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water
equal to 2 ml. The height of the water rose to 7 ml. If the mass of the stone was 25 g, what was
its density?
Answer
1
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What are you looking for?
QC. Numericals
1. A car covers a distance of 160 km between two cities in 4 h. What is the average speed of the car ?
Ans : 40 km h–1
2. A train travels a distance of 300 km with an average speed of 60 km h–1 . How much time does it take to cover the distance ?
Ans : 5 h
3. A boy travels with an average speed of 10 m–1 for 20 min. How much distance does he travel ?
Ans : 12 km
4. A boy walks a distance 30 m in 1 minute and another 30 m in 1.5 minute. Describe the type of motion of the boy and find his average speed in m s–1. Ans : non-uniform. 0-4 m s –1
or a block of plastic measuring 2cmX3cmX1cm with a mass of 4g?Convert the value of the density
into kg/m³.
value of the density into kg/m³.
Objects will sink if their density is greater that water and will float if their density is less. For the following
problems, decide if the block will sink or float.
a. A cube measuring 2cm on each side weights 5g, will it sink or float?
b. A block has a mass of 20g and measures 2cmX4cmX2cm, will it sink or float?
c. A hollow iron cube has measures 5cm on each side and has a mass of 20g. Will the iron cube sink or float?
equal to 2 ml. The height of the water rose to 7 ml. If the mass of the stone was 25 g, what was
its density?