Request a call back

Join NOW to get access to exclusive study material for best results

ICSE Class 10 Answered

1) Why is no work done when a person is holding a briefcase in his hand ? 2) Sometimes the air bubbles emerging out of a fish tank apeear silvery ? 3) Why do the faces of the persons sitting around a camp fire appear to be shimmery ? 4) State two important precauitions during an experiment for finding specific latent heat of ice . 5) An electric bulb gives much brighter light when the magnitude of emf increases . Explain  6) State two ways of increasing magnitude of induced current .  7) From the ground floor , a man comes upto the fourt floor of a building using a staircase . Another person comes upto the same floor , using an elevator . Neglicting frition , comparee the work done in two cases .  8) What is the range of loudness level for normal conversation and whispering ? 9) How does the water in a living system( just as our body ) controls and maintains our body temperature ? 10) What do you understand by the term refraction of light ? 11) Why do the diamonds sparkle ? 12) Explain briefly the energy released in a thermal power plant is converted into electric energy .  13) Why is the power generated at the power houses stepped up during transmission ? 14) Why are the coils of a heavy transformer immersed in a special kind of oil ? 15) A copper calorimeter weighing 57.5g contains 60g of water at 12 degree C , 55 g of iron nails at 100 degree C are dropped into the calorimeter , when the final temperature of the contents of calorimeter is 20 degree C . Calculate the specific heat capacity of iron . [ Specific heat capacity of copper is 0.4 J/gC and that of water is 4.2 J/gC]  16) Calculate the wavelength of an electromagnetic wave of frequency 15 MHz  17) What do you understand by the term radioactivity . 
Asked by DILIP | 16 Feb, 2019, 11:11: PM
answered-by-expert Expert Answer
When the person is standing at a place holding a suitcase, there is no change in the position of the man or the suitcase.
Therefore, displacement (s) = 0
W = F × s
W = F × 0 = 0
 
When the person is moving holding the suitcase in his hand, he applies force in the upward direction and the displacement of the suitcase is in the forward direction, i.e. perpendicular to the direction of the force applied.
Therefore, angle theta = 90 degrees
Since W = F × s cos (theta)
W = F × s cos90˚ = 0
Hence, work done on the suitcase is zero.
Answered by Science Mate | 17 Feb, 2019, 01:05: AM
ICSE 10 - Physics
Asked by diahant.taunk10 | 24 Nov, 2021, 08:46: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
Asked by ss130001.jashkaransingh | 14 Sep, 2021, 08:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
Asked by akash21gsk | 22 Jun, 2020, 08:16: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
Asked by snehalburud22.10spicertl | 11 Jun, 2020, 03:26: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
Asked by sanjeevrao.2704 | 04 Jun, 2020, 08:43: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×