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A single cell is placed into a culture tube containing nutrient agar. If the number of cells doubles every 2 minutes and the culture tube is completely filled in 8 hours, how long does it take for the culture tube to be only half full of cells? please explain!
Landing on the Moon, a spacecraft fires its retrorockets and comes to a complete stop just 19m above the lunar surface. It then drops freely to surface.How long does it take to fall in seconds? What is its impact speed in meter per seconds.
A flywheel comprises a uniform circular disk with a moment of inertia of 5.70×101 Kg m2. What energy (in Joules) must this force dissipate to stop the wheel
The hydrogen spectrum has a red line at 656 nm and a violet line at 434 nm. What angular separation between two spectral lines obtained with a diffraction grating that has 4920 lines/cm? (Assume that the light is incident normally on the grating.) fi..
an insulated beaker with negligible mass contains liquid water with a mass of 0.215 kg and a temperature of 66.8 c. how
in coming to a stopa car leaves a skid marks 92m long on th highway. assuming a deceleration of 7.0 ms squared estimate
What is the safe operating voltage for a 100 Ohm, 1/10W resistor? The maximum current? How much power is dissipated at half the maximum voltage
A lead ball is dropped into a lake from a diving board 9.10 meter above the water. Find with what velocity does ball hit the water surface
Five thousand joules of heat is put into a Carnot engine whose hot and cold reservoirs have temperatures of 600 and 200 K, respectively. How much heat is convertedd into work?
the cool end has a constant temperature of 22°C. What is the temperature of the rod 25cm from the cool end
A container of volume 23 cm3 is initially filled with air. The container is after that evacuated at 0oC to a pressure of 30 mPa. How many molecules are in the container after evacuation if we suppose that air is an ideal gas.
If the three friends pull the object at constant velocity for 10 m, how much work have they done? What is the coefficient of kinetic friction between the object and the surface?
A block with mass m = 0.80 kg is forced against a horizontal spring of negligible mass, compressing the spring a distance of 0.20 m. When released, the block moves on a horizontal table top for 1.00 m before coming to rest. The spring constant k is 1..
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