575 - Physics Questions Answers
Can You Please Explain the Cartesian method for mirror and Lens?
Cartesian method is the method of sign convention
Sir/Madam,
Can you please explain me to find potential difference between two plates of capacitor like this shown in figure. Can you Give anymore examples if possible? Thank You! (Please omit time)
after time t charge on plates of capacitor q = CE(1-e-t/RC)
then potential difference between the plates of capacitor = q/C
after a long time this potential difference = E [this can be obtained by putting t = ∞]
A particle has initial velocity of y = 3i+ 4j and a constant force F = 4i -3j acts on it. Then what will be the path followed by the particle?
acceleration is constant and initial velocity is perpendicular to it because dot product of two given vectors is 0 so this is the case equivalent to a particle thriwn from the top of a building horizontally under gravity so path will be parabolic
if you want the equation of path then reply
A block of mass 100 g is moved with a speed of 5 m/s at the highest point in a closed circular tube of radius 10 cm kept in vrtical plane.The cross section of the tube is such that the block just fits in it.The block makes several oscillations inside the tube and finally stops at the lowest point. Find the work done by the tube on the block.
Total energy is lost so K E will be the work done
A ball is dropped from the top of the tower of height h. It covers a distance h/2 in the last second of its motion. How long does the ball remain in air?
let total time of flight = t
so h = gt2/2 and
h/2 = gt-(g/2)
so gt2/4 = gt-(g/2)
or t2/4 = t -(1/2)
now solve
If L is the angular momentum of a satellite revolving around earth is a circular orbit of radius r with speed v, then (i) L α v
(ii) L α r
(iii) L α √v
(iv) L α √r
L = m*v*r
If potential energy of a body of mass m on the surface of earth is taken as zero then its potential energy at height h above the surface of earth is [ R is radius of earth and M is mass of earth]
[-GMm/(R+h)]-[-GMm/R] = GMm[1/R - 1/(R+h)]
solve ?
Two points masses having m and 4m are placed at distance at r. The gravitational potential at a point, where gravitational field intensity zero is
field intensity at distance x from m = Gm/x2 - G4m/(r-x)2
compare it to 0 and find x
then calculate gravitational potential at the point
During motion of a planet from perihelion to aphelion the work done by gravitational force of sun on it is positive or negative.
change in K E = work done by all the forces
and from perihelion to aphelion velocity decreases
so work done will be negative
If an object is projected vertically upwards with speed, half the escape speed of earth , then the maximum height attained by it is [R is radius of earth]
from ground to that point
1/2 m[√(2gR)/2]2 + [-GMm/R] = 0 + [-GMm/(R+h)]
solve for h