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1. A biologist wishes to determine the density of an oil sample that she has extracted from a rare species of plant. She puts some distilled water (with some food coloring added for visibility) in a small U-tube and then pipettes the oil sample in on top of the water. The system comes into equilibrium as shown below. If the water has a density of 1000 kg/m3 then what is the density of the oil?
In the frame S, two electrons approach each other, each having a speed v = c/2. What is the relative speed of the two electrons
A 2.6-kg cart is rolling along a frictionless, horizontal track towards a 1.7-kg cart that is held initially at rest. What is the total momentum of the system of the two carts at this instant
A ball is thrown from the window of a high-rise building with an initial velocity of 5.1 m/s at an angle of 22 deg. how fast is the ball travelling when it hits the (horizontal) ground
The primary coil of a transformer has 232 turns; the secondary coil has 1900 turns. An alternating current is sent through the primary coil. What is the emf amplitude in the secondary
Hail is falling on the roof of a car at a mass rate ofm/t = 0.070kg/s and an inital velocity of v0 = -10m/s, Calculate the force exerted by the hail on the roof
Suppose your waffle iron is rated at 0.85 kW when connected to a 2.10 102 V source. What current does the waffle iron carry
A river 18.0m wide and 4.0m deep drains a 3000.0km2 land area in which the average precipitation is 48cm/year. What is the average speed of the river
A uniform electric field with a magnitude of 450 N/C is directed parallel to the positive x-axis. If the electric potential at x = 3.00 m is 1 000 V, what is the change in potential energy of a particle
The electric field everywhere on the surface of a thin spherical shell of radius 0.780m is measured to be equal to 940 N/C and points radially toward the center of the sphere.
The drawing shows a sulfur dioxide molecule. It consists of twooxygen atoms and a sulfur atom. A sulfur atom is twice as massiveas an oxygen atom. Using this information and the data provided inthe drawing, find the coordinates of the center of ma..
questionan elevator of mass 2268 kg rest at a level of 7.62 m above a base of elevator shaft. it is raised to 76.2 m
A teeter-totter is made of a 5.400 m long plank with a mass of 58.0 kg, with a fulcrum (pivot point) located 2.900 m from the right end. If a box with a mass of 94.0 kg is placed at the extreme right end of the plank, what mass must be placed at the ..
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