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A worker pulls horizontally on a crate on a rough horizontal floor, causing it to move forward with constant velocity. In the figure, force is the pull of the worker and force is the force of frict
A parallel-plate air capacitor is made from two plates 0.070 square, spaced 9.3 apart. What must the potential difference between the plates be to produce an energy density of ?
How might you use a radioactive isotope to find out whether the oxygen in co2 comes form sugar or oxygen gas?
The clerk pulls with a force of 175.0 N at an angle of 30° with the horizontal. The box has a mass of 31 kg, and the coefficient of kinetic friction between the box and the floor is 0.45. Find
Archaeologists discover skeletal remains of human like animals in Ethiopia.
A laboratory ultracentrifuge is designed to produce a centripetal acceleration of 5.0 106 g at a distance of 4.00 cm from the axis. What angular velocity in rev/min is required?
You are designing a new single-celled organism. Discuss the problems of size, getting molecules like nutrients and wastes in and out, temperature, energy and replication of genetic materials
A uniform disk can rotate around its center like a merry-go-round. The disk has a radius of 2.00 cm and a mass of 20.0 grams and is initially at rest. Starting at time t=0, two forces are to be app
Does the geometry of distribution of multiple charges affect the electric field generated by the charge?
Lab report on ubiquity timed experiment with 6 plates of agar.I need explaination on the number of colonies formed when agar is exposeed to air at diferent time" "
A 5.25-kg ball of clay is thrown downward from a height of 2.79 m with a speed of 4.41 m/s onto a spring with k=1530 N/m. The clay compresses the spring a certain maximum amount before momentarily s
A cube of ice is taken from the freezer at -8°C and placed in a 100 g aluminum calorimeter filled with 298 g of water at room temperature of 20°C. The final situation is observed to be all
Red blood cells come in many "blood types" including type a, type b, type AB...... If blood is transfused, the recipient detects any new or "foreign" proteins. These blood type proteins are
The engineer of the high-speed train immediately applies the brakes. What must be the magnitude of the resulting constant deceleration if a collision is to be just avoided?
A 1-kg iron block is to be accelerated through a process that supplies it with 1 KJ of energy. Assuming all this energy appears as kinetic, what is the final velocity of the block?
As a result of his observations, Ole Roemer concluded that eclipses of Io by Jupiter were delayed by 22 min during a six-month period as the Earth moved from the point in its orbit where it is clos
1) Assume the diameter of the field of vision in your microscope is 2mm under low power. If one Bacillus cell is 2um, how many Bacillus cells could fit end across the field? How many 10um yeast cells
A plane flies from base camp to Lake A, 300 km away in the direction 36.9° south of east. After dropping off supplies it flies to Lake B, which is 260 km at 30.0° west of north from Lake A.
The cellular organelle of eukaryotic organisms which is responsible for photosynthetic activity is the
A cube of ice is taken from the freezer at -5.7 and placed in a 100 aluminum calorimeter filled with 306 of water at room temperature of 20.0 . The final situation is observed to be all water at 15
If the magnitude of the instantaneous velocity at t1 is v1 = 3 m/s, what is the instantaneous velocity v2 at time t2? Determine the magnitude of the instantaneous acceleration of the object at time t2
Discuss in detail how negative feedback works with the thyroid gland and its hormones
A 13 g bullet traveling 233 m/s penetrates a 2.0 kg block of wood and emerges going 175 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet em
Describe neurotransmission and explain using relevent examples how it influence cognitive proccesses
Capacitors C1 = 6.11 uF and C2 = 1.54 uF are charged as a parallel combination across a 291 V battery. The capacitors are disconnected from the battery and from each other. They are then connected p