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Ask more people. Just before a presidential election, a national opinion-polling firm increases the size of its weekly sample from the usual 1500 people to 4000 people. Why do you think the firm does this?
A hollow cylinder (hoop) is rolling on a horizontal surface at a speed v=3.3 m/s when it reaches a 15 degree incline. estimate how far up the incline will it go
A person with a digital camera uses a lens of focal length 15.0mm to take a photograph of the image of a 1.40cm -tall seedling located 9.80cm behind a double-convex lens of 17.0cm focal length
Light is incident normally on the largest face of an isosceles-right-triangle prism. What is the speed of light in this prism
A system gains 2960 Joule of heat at a constant pressure of 1.31× 105 Pa, and its internal energy increases by 4040 Joule. Determine the change in the volume of the system
Light from a laser beam with a wavelength of 600 nm passes through a narrow single slit and observed on a screen 1.5 m behind the slit. How wide is the slit
an infinitely wide charged non-conducting slab with a non-zero thickness is centered over the xy plane as described.
a point charge of -6 microc is located at x 1 m y -2 m. a second point charge of 12 microc is located at x 1 m y 3
A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N. As the string unwinds the pulley begins to rotate. What..
An object of mass 1.2kg is placed 0.1m from the axis of a rotating turntable of variable speed. Find the number of revolutions per minute at which the object just starts to slide off
Precisely 1.10 after the speeder passes, the policeman steps on the accelerator. If the police car's acceleration is 2.10 m/s2, Explain how much time elapses after the police car is passed until it overtakes the speeder
A Porsche 944 Turbo has a rated engine power of 217 . 30% of the power is lost in the drive train, and 70% reaches the wheels. what is its speed when it reaches maximum power output
A 5.0 kilogram block is initially at rest on the surface of a smooth frozen lake. Mary applies a 7.0 N horizontal force directed North, Find the total horizontal force on the box
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