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Q1. An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 400-g sample of silver at an initial temperature of 87°C is placed in the water. The stirrer is used to stir the mixture until it reaches its last equilibrium temperature of 32°C. Analyse the mass of the aluminum cup.
Q2. A potter's wheel having a radius 0.50 m and a moment of inertia 14.3 kg•m2 is rotating freely at 51 rev/min. The potter can stop the wheel in 5.0 s by pressing a wet rag against the rim and exerting a radially inward force of 66 N. Find out the effective coefficient of kinetic friction between the wheel and the wet rag.
A small coil of 40 turns and a surface area 30 cm^2 has its plane perpendicular to a magnetic field B=0.5T. how much charge passes through the coil
A cylinder which is in a horizontal position contains an unknown noble gas at 4.63 × 104 Pa and is sealed with a massless piston. calculate the change in internal energy of the system
Light of intensity 2.5W/m2 passes through the pupil of one of your eyes and eventually falls on your retina. The radius of the pupil is controlled by the iris.
The isotope 88224Ra of radium has a decay constant of 1.19×10-6 per second. What is the half-life (in days) of this isotope
The position of a particle moving along the x axis is given by x = (32 + 40t - 8.0t2) m, where t is in s. What is the average velocity during the time interval t = 1.0 s to 3.0 s?
The force involved in a collision is 1.0 × 10^2 newtons. What is the value of the change in momentum
The spring of the pressure gauge has a force constant of1000 n/m and the piston has a diameter of 2.00 cm as the gauge is lowered into water, what change in depth causes piston to move in by 0.50 cm.
A football is kicked from ground level and lands 57.0 m downfield. What max heigh above the ground does the ball reach
Assuming that all radiation is emitted at the wavelength of peak intensity, for a skin temperature of 34 degrees C and a surface area of 1.6 m2, how many photons per second does the body emit
A solenoid is wound with a single layer of insulated copper wire of diameter 2.000 mm and has a diameter of 5.000 cm and is 1.800 m long. How many turns are on the solenoid
A compact disc rotates from rest up to an angular speed of 31.4 rad/s in a time of 0.892 s. What is the magnitude of the tangential acceleration
A 2.30-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 3.40sin(2?t), Find the angular frequency of the driven system
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