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A count rate meter is used to measure the activity of a given sample. At one instant, the meter shows 4.750 counts/min. Five minutes later, it shows 2700 counts/min. Find
a) the decay constant
b)the half life of the sample (log101.760=0.2455)
Two circular plates of radius 5.22 cm possess a charge separation of 8.252 ?C. find the electric field between the two plates
An Earth satellite has a speed of 29500 km/hr when it is at its perigee, 230 km above Earth's surface. Find the apogee distance, the speed at apogee, and the period of revolution.
Determine an angle (in radians) through which the drill rotates during this period.
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 45.0cm . The explorer finds that the pendulum completes 99.0 full swing cycles in a time of 145s What is the magnitude of the gravitational acceleration on..
An aluminum calorimeter with a mass of 100 g contains 250 g of water. The calorimeter and water are in thermal equilibrium at 10.0°C. Determine the specific heat of the unknown sample
An electron traveling at 15 m/s enters a 1.3 T magnetic field. The angle between the velocity and the field is 90o. Find the radius of the resulting circular path.
You have a lens with a focal length of 35 cm. You need to combine this lens with another, What focal length should you choose for the second lens
A hockey puck struck by a hockey stick is given an initial speed of 10 m/s. how far will the puck slide before stopping
A rock of mass m = 1.0 kg is tied to a string of length L = 1.9 m and is twirled in a vertical circle. The speed v of the rock is constant; that is, it is the same at the top and the bottom of the circle. If the tension in the string is zero when the..
A 35.0-kg boy, riding a 2.50-kg skateboard at a velocity of +5.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 7.30° above the h..
A 1200 kg car carrying four 84 kg people travels over a rough washboard dirt road with corrugations 4m apart which causes the car to bounce on its spring suspension.
A brick has a mass of 1.10 kg. What is the brick's weight at the surface of the Earth? A bucket of water weighs 48.2 N. What is the mass of the bucket and water?
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