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Q1. A 60 m ladder leans against a wall. What is the minimum force of friction essential to prevent the ladder from sliding? Presume that the force in the wall is negligible.
Q2. Two identical diverging lenses are separated by 12 cm. The focal length of each lens is -7.0 cm. An object is located 5.0 cm to the left of the lens that is on the left. Find out the final image distance relative to the lens on the right.
Q3. Radioactive isotopes frequently occur together in mixtures. Assume a 400g sample contains, with a half-life of 12 days, and, with a half-life of 4.5 days. If there are firstly twice as many calcium atoms as there are barium atoms, what will be the ratio of calcium atoms to barium atoms 3.50 weeks later?
If the average frequency emitted by a 200,-, rm W light bulb is 5.00 times 10^ {14}, {rm Hz}, and 10.0 percent of the input power is emitted as visible light, about how many visible-light photons are emitted per second.
The speed of light in a transparent medium (such as glass) is less than the speed of light in a vacuum. Is this a violation of the theory of relativity.
When he reaches equator, the sphere is rotating at how many rpm. A car takes 9 s to go from v = 0 to v = 55 m/s at about constant acceleration.
Assume that plane continues to fly with the similar velocity
What is velocity of wind that is moving the plane
A 1.2 kg mass attached to a spring oscillates with amplitude of 6.3 cm and a frequency of 1.1 Hz. What is its energy of motion.
A converging lens has a focal length of f = 26 cm. An object is placed 39 cm from the lens. Find out the size of an image in cm if the object has a height of 5 cm. express answer with one decimal place.
The effectual coefficient of kinetic friction is 0.37. Compute the work done by the man on the piano.
Calculate change in kinetic energy
What is t he steam-side coefficient
Conclude the electric field at the origin
A diffraction grating with 330 {rm lines/mm} is 1.00 {rm m} in front of a screen. What is the wavelength of light whose first-order maxima will be 17.0 {rm cm} from the central maximum on the screen.
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