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A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. Fourteen minutes later, the count rate is 2,000 counts per minute. What is the half-life of the radioisotope?
A proton is released from rest inside a region of constant, uniform electric field E1 pointing due North. 27.3 seconds after it is released, What is the ratio of the magnitude of E2 to the magnitude of E1
A block of wood 34 cm wide and 85 cm tall is placed on a merry-go-round which rotates at 0.95 rad/s. How far from the center may the block be placed before it will tip over?
A ball of aluminum is at a depth of 100.0 m under water whose density is 1,000 kg/m3. The bulk stress on the ball due to the water is
The mass of a proton or neutron is about 2000 times that of electron. Using the approximate rest energy of the electron, Calculate the approximate rest energy of a carbon
a plane traveling at a speed at 1300kmhr in a northerly direction at height of 5 km above the ground suddenly climbs at
A machinist turns the power on to a grinding wheel, at rest, at time t = 0 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 66 rad/s. The wheel is run at that angular velocity for 37 s and then power is shu..
If the Moon were less massive and/or further away, then the gravitational force of the Moon on the oceans would diminish.
A parallel beam of light containing red (660 nanometer) and violet (410 nanometer) wavelengths goes from crown glass to water, Obtain the angle between the two colors in water
In a specific heat experiment 210.0 grams of aluminum (C=913.0 J/kg.K) at 100.0°C) is mixed with 36.0 g water at 20.0°C. Find the entropy change of the water
What is the highest speed with which a 1550 car can round a turn of radius 76 on a flat road if the coefficient of static friction between tires and road is 0.50.
question what is the minimum number of 70 ohms resistors that must be connected in parallel to produce an equivalent
When a block slides across a floor, what is the direction of the frictional force acting on the block from the floor? in the direction of the sliding. opposite the direction of the sliding
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