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Describe the effect on speed, frequency, and wavelength of a sound traveling from warm to cold air. (hint:cold air is more dense than warm air).
An automobile engine slows down from 3000 rpm to 900 rpm in 4.5 s. find the total number of revolutions the engine makes in this time
Consider two spherical stones with same density (mass per unit volume). Find the ratio of the terminal speed in air of the larger stone to that of the smaller stone
A village maintains a large tank with an open top, containing water for emergencies. The water can drain from the tank through a hose of diameter6.55cm. compute the friction force exerted by the nozzle on the stopper
A horizontal force of 210N is exerted on a 2.0 kg discus as itrotates uniformaly in a horizontal circle ( at arm's length ) ofradius .90 m. Calculate the speed of the discus
What voltage must be applied to the 10.0 µF capacitor of a heart defibrillator to store 450 J in it? Find the amount of stored charge
A 12.0 g bullet is fired horizontally into a 100 g woodenblock that is initially at rest on a frictionless horizontalsurface and connected to a spring having spring constant 150 N/m. what was thespeed of the bullet at impact with the block
An automobile starter motor has an equivalent resistance of 0.0660 ? and is supplied by a 12.0-V battery with a 0.0170-? internal resistance. What is the current to the motor
A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 480 m. What is the speed of the current
1 what is the spring stiffness of the entire wire considered as a single macroscopic large scale very stiff spring?2
A certain string just breaks when it is under 25 N of tension. A boy uses this spring to whirl a 0.75kg in a horizontal circle of radius 2.0m. At approximately what speed will the string break
Your task in physics lab is to make a microscope from two lenses. One lens has a focal length of 2 cm, the other a focal length of 1 cm. What will be the magnification of your microscope
A light wave was reflected off of a mirror at an angle of56°. What was the incident angle? A light ray in water is incident on fused quartz at a 31° angle of incidence. Find the angle of refraction.
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