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in its daily prow of the neighborhood a cat makes a displacement of 100m due north followed by an 80m displacement east. what is the magnitude and direction of the velocity
a road rises 1ft for every 100ft it travels horizontally it is said to have a 15 grade. if the road you are traveling on has a 5 % grade what is the angle of the road above the horizontal
A bat emits chirping sounds of frequency 75 kHz while hunting for moths to eat. The bat flies east at 8 m/s. What is the frequency of the reflected sound detected by the bat
A glaucous-winged gull, ascending straight upward at 5.00m/s , drops a shell when it is 14.0m above the ground. how long did it take for shell to hit the ground?
A pressure wave in air is described by the following equation: P(x,t) = A sin(2(pi)t/T - 2(pi)x/lambda), Determine the speed of the pressure wave
A wedge of mass M and angle ? is placed on a flat frictionless surface. A crate of mass m is placed on the wedge at height h and starts sliding down the wedge without friction. Find the accelerat
A 89 kg box rests on a level surface as shown in Figure 1. The coefficient of static friction, µS = 1.3 and the coefficient of kinetic friction, µK = 0.9. find the magnitude of Gravity
In a biochemical pathway, three ATP molecules are hydrolyzed. The endergonic reactions in the pathway require a total of 17.3 kcal/mole of energy to drive the reactions of the pathway.
One can not align the apparatus to eliminate entirely the effects of the Earth's magnetic field. calculate the component of the earth magnetic field perpendicular to the entering electron beam
A heterzygous plant ABCDE/abcde is crossed with an abcde/abcde plant. Only the following progeny are found in the F1: ABCDE/abcde, abcde/abcde, Abcde/abcde, aBCDE/abcde, ABCDe/abcde, and abcdE/abcde.
In the f2 generation, how many genotypic classes could be generated from a dihybrid cross of two heterozygotes in which the genes involved show complete dominance
A person with mass m1 = 52 kg stands at the left end of a uniform beam with mass m2 = 109 kg and a length L = 3.1 m. What is the location of the center of mass of the system
The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized in the rough ER,
A heavy sled is being pulled by two people as shown in the figure. The coefficient of static friction between the sled and the ground is ?s = 0.571, what is the minimum rope tension required to get
In the diversity and abundance of bacteria, we always have some uncertainty about the identity of an isolate. With this in mind, how can we be certain that growth with a metallic sheen is truly a co
Digital bits on a 12.0-cm diameter audio CD are encoded along an outward spiraling path that starts at radius R1=2.5cm, Determine the total length of the spiraling path
You suspect that Michael has sickle cell anemia and you have ordered an isoelectric focusing analysis of the child's lysed red blood cells. (Lysing the red blood cells releases the hemoglobin.)
what would you expect to happen to the virulence of lyme disease in humans if the pathogen that cause it ( a spirochete bacterium) were to become sexually transmissible between humans
The bacterium Helicobactor pylori naturally grows in human and animal stomachs at pH about 2. It will grow also at pH 2 and pH 7 in culture media. It's genome sequence has been determined and annota
Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 60.0?. Dog A exerts a force of 272N , and dog B exerts a force of 346N. Find the magnitude of the resultant for
A dockworker applies a constant horizontal force of 88.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. What is the mass of the block of ice
A hot-air balloon consists of a basket, one passenger, and some cargo. Let the total mass be M. Find the upward lift force in terms of the initial total weight Mg
Are they necessarily required or simply an artefact of the evolutionary history of eukaryotes. Why, for example, would eukaryotic cells require a membrane-bound nucleus when prokaryotes seem to repl
The equation of a transverse wave traveling along a very long string is y = 5.5 sin( 0.055?x + 36.0?t ), What is the maximum transverse speed of a particle in the string
A Van de Graa? generator has a potential di?erence of 2.35 MV between the belt and the outer shell. What minimum power is needed to drive the moving belt