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A person lifts a 500N barbell overhead. the barbell is 1.84m long and half the weight is loaded on each(assuming the bar is weightless). if the hands grip the bar 30.0cm and 40.0cm on each side fro
Consider the changes that occurred both structurally and functionally as plants evolved to their modern forms. If you were to discover a totally new plant to you, what characteristics would you look f
To hoist himself into a tree, a 69.0 kg man ties one end of a nylon rope around his waist and throws the other end over a branch of the tree. He then pulls downward on the free end of the rope with
A point charge of +5Q is placed at the center of a square. When a second point charge of -Q is placed at one of the square's corners, it is observed that an electrostatic force of 3 N acts on the p
The binary star system Krell consists of two stars, Krell A and Krell B, orbiting each other, with no other ojects nearby. Find the ratio of the orbit speeds vA/vB.
Explain how the long-term survival of a species depends on resources that may be limited from time to time.
A 27 kg loudspeaker is suspended 3.0 m below the ceiling by two cables that are each 50 degrees from vertical. What is the tension in the cables?
Calculate the magnitude of the electric field at one corner of a square 1.1 m on a side if the other three corners are occupied by 3.05x10-6 C charges in N/C.
A 8.1 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.710 T pointing up. During the course of 0.160 s, the field is changed to one of 0.280 T
Single-stranded DNA molecules are said to be antiparallel when they are lined up next to each other but oriented in opposite directions.
What is the magnitude of the acceleration of a speck of clay on the edge of a potter's wheel turning at 50 (revolutions per minute) if the wheel's diameter is 38 cm?
Which one of the following is the main reason that a typical eucaryotic gene is able to respond to a far greater variety of regulatory signals than a typical procaryotic gene or operon?
The K-shell binding energy of an electron in a lead atom is 88.0 keV and the L-shell energy is approximately 15.0 keV. A 100 keV photon ejects a K-shell electron. What is the energy of the photoelec
A stream of water gets narrower as it falls from a faucet (try it and see). Explain this phenomenon using the equation of continuity.
An experiment is designed to study the mechanism of surose uptake by plant cells.
At time a grinding wheel has an angular velocity of 21.0 . It has a constant angular acceleration of 26.0 until a circuit breaker trips at time = 1.6. From then on, the wheel turns through an angle
A series of enzymes catalyze the reaction X-->Y-->Z-->A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of t
Two points A and B lie 20 cm apart on a line extending radially from a point charge Q. If the potential at A is 150 V and the potential at B is 120 V, find the charge Q and the distance of point A
A boy is sledding down a snow covered hill inclines at 35 degrees. The combined mass of the boy and his sled is 125 kg and the coefficient of kinetic friction between the sled and the snow is .267.
Two spherical point charges each carrying a charge of 40 μC are attached to the two ends of a spring of length 20 cm. If its spring constant is 120 Nm-1, what is the length of the spring when th
A proton moving to the right at 6.2 × 105 ms-1 enters a region where there is an electric field of 62 kNC-1 directed to the left. Describe qualitatively the motion of the proton in this filed
A 5.0 kg mass on a 1m long string swings in a circle on a horizontal, frictionless tables at a steady speed of 2 m/s. how much work does the tension in the string do on the mass during one revoluti
You are driving home from school steadily at 98km/h for 140km . It then begins to rain and you slow to 64km/h . You arrive home after driving 3 hours and 30 minutes. How far is your hometown from s
Planet Z is in elliptical orbit about the star Loki. At perihelion, the planet is moving at speed vp = 1.92x104 m/s. Find va, the speed of Planet Z at aphelion.
When a force of 19 N is applied to a spring, it elongates 0.085 m. Determine the period of oscillation of a 4.0-kg object suspended from this spring.