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Explain phototropism in plants, including the role of auxin in tropisms, and the relevance of coleoptiles.
A cube of ice is taken from the freezer at -9.3°C and placed in a 95 g aluminum calorimeter filled with 297 g of water at room temperature of 20°C. The final situation is observed to be all
Write a one page essay discussing common household items(chemicals)that you would expect to find in a cell
There is a net passage of 6.0 x 1018 electrons by a point in a wire conductor in 0.14 s. What is the current in the wire?
What are the effects of pH on the rate of fermentation?
A spring (spring constant = 104 N/m) is mounted on the floor and is oriented vertically. A 0.400 kg block is placed on top of the spring and pushed down to start it oscillating in simple harmonic m
Determine the magnitude of the electric field along the axis of the rod at a point 47.2714 cm from the center of the rod.
What do you understand the word asymptote and how does it related to population growth model?
An object is found to have a weight in air of 500 N. It is then tied to a string connected to a balance and immersed in water (density of water is 1000 kg/m3). The scale now reads 450 N. Finally th
According to clonal selection theory, all the immunoglobulin molecules on a single B cell have the same antigenic specificity. Explain why the presence of both IgM and IgD on the same B cell does not
One mole of an ideal gas does 2160 J of work on the surroundings as it expands isothermally to a final pressure of 0.8 atm and volume of 37 L. The universal gas constant is 8.31451 J/K · mol.
A square coil that is 20 cm on a side is made of 10 turns of wire. It is in a 0.8T magnetic field that is perpendicular to the plane of the coil. The coil has a resistance of 100 ohms. If it takes 0
You design a simple friction-brake to stop the cylinder by pressing the brake against the outer rim with a normal force. The coefficient of kinetic friction between the brake and rim is 0.344. What
During a hard sneeze, your eyes might shut for 0.30 s. If you are driving a car at 120 km/h during such a sneeze, how far does the car move during that time?
On a rainy day, raindrops fall with a vertical velocity of 11.7 m/s. If a car drives through the rain at 87.0 km/hr, what is the magnitude of the velocity of the raindrops relative to the car?
What type of genes are expressed by the mother and have their products deposited into the developing egg?
A cylindrical shell of radius 9 cm and length 277 cm has its charge density uniformly dis- tributed on its surface. What is the net charge on the shell?
Describe how the mammalian immune system responds to a laceration
Suppose the force acts at the bottom end of the rod. Find the acceleration of its center of mass and the horizontal force the hinge exerts.
Describe the events that occur at a chemical synapse when a single nerve impulse arrives at a synaptic end bulb and describe how this may lead to the initiation of a nerve impulse in the neighbo
The ratio of the average acceleration values is a1/a2 = 1.61. Find the velocity of the car at the end of the initial ten-second interval.
In examining a picture of a cell taken with an electron microscope, a student observes that the cell has a nucleus and a cell membrane but not a cell wall. The student can correctly conclude that the
Two vectors A and B have the same magnitude of 100 N (they represent forces of equal strength). What is the magnitude of the resultant vector of A and B if they are parallel and pointing in opposit
She comes to rest 1.12 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This force is nonconservative.
When one person shouts at a football game, the sound loudness at the center of the field is 50 dB. When all the people shout together, the loudness increases to 110 dB. Assume that each person is ab