1.A light mass and heavy mass have equal momentum.Which will have more KE,Why?
2.Two equal and opposite forces act on an object.How is its motion affected?Give Reason.
3.What is the advantage of using a concave horse shoe magnet over straight magnet in electric motors.
4.If u place ur ear close to an iron railing which is tapped some distance away you hear the sound twice
5.The lower block of a block and tackle pulley must b of negligible weight.
6.The sun is seen few minutes before sunrise above the horizonand even after it sets.
7.The scissors for cutting cloth may hv blades longer than the handle,but shears cutting metals have short blades and long handles
Hope to get answers soon:)
Please answer the following :
1200g of molten lead at its melting point 325 degrees Celsius, is dropped into 600g of water at 10 degrees Celsius. Calculate the final temperature of the mixture. (Specific heat capacity of lead=0.15,water=4.2,and specific latent heat of fusion of lead=30 joule per gram)
1)What is the refractive index of an opaque body?Give reason.
2)On what factors does velocity of wave in a medium depend?
3)State the unit of magnetic field in terms of force experienced by a current carrying conductor placed in a magnetic field.
4)When can an electric charge give rise to a magnetic field?
5)Heat supplied to a substance during its change of state does not cause any rise in temp.Explain.
A block weighing 20kgf is pulled up a slope at a constant speed by a constant force
of 150 N.(g=10m/s2) Calculate :
i) The work done by the force in moving along the slope
ii)The increase in the potential energy of the body.
iii)The amount of energy dissipated in pulling up the body along the slope.
Show the working please
A metal ball coated with soot appears to shine underwater.
A person's face sitting near a campfire appears to shimmer.
Optic fibres along the road shine brightly during daytime
A person experiences mirage in a desert
Stars appear to twinkle in the sky
A truck driver sometimes sees a pool of water ahead of him on a road
Give Reasons pls
Can someone please upload the Gear stuff from 2017 edition of Selina Concise Physics so that all of us can agree on a common point wrt the Question in BS Powai paper.
PS: I am the unluckiest here ( I have 2014 edition :( )
THANKS IN ADVANCE !
According to : V = IR
Voltage is directly proportional to Current
But according to: P = VI
Voltage is indirectly proportional to Current
Does it has to do something with the quantity which we want to keep constant.
200g of ice at 0 degree Celsius converts into water at 0 degree Celsius in one minute when heat is supplied to a constant rate in how much time 200g of water at 0 degree Celsius will change to 20 degree Celsius ?Take specific heat latent of ice = 336j?
A cell of emf 2V and internal resistance 1.2V is connected to an ammeter of resistance 0.8V and two parallel resistors of 4.5ohm and 9ohm. Find the reading of the ammeter, the PD across the terminals of the cell and the PD across the 4.5 ohm resistor
Questions from calorimetery
1. In case of a pizza, the crest and the sauce are at the same temperature. Biting a hot pizza sauce produces greater burning effect in your mouth as compared to crest. Why is it so?
2. On a hot summer day you remove a chilled water melon and a chilled sandwich from a refrigerator. Which of the two shall remain cool for a longer time?
3. What is regelation?
4. Why is water in earthern pitcher cold?
An earnest request to all those students who attempted a regional language paper ( Tamil, kannada, bengali etc) :
Can you post the essays and letters that you had received in the question paper in : English or Hindi? It will be beneficial to all Hindi students as a similar topic may come.