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A ball of mass 5.0 kg is lifted off the floor a distance of 1.7m. What is the change in gravitational potential energy of the ball? If the ball is released from rest and falls to the floor, what is the kinetic energy of the ball just before it hits the floor? what is it velocity? What if it was attached to a parachute, is the KE same, larger or smaller and it mechanic energy conserved in this case?
Discuss displacement versus distance moved for an object and illustrate with examples. Define Inertia and explain its consequences on motion
The refractive index of a material is 2.58. What is the critical angle for a light ray
Water is being boiled in an open kettle that has a 0.500 cm thickcircular aluminum bottom with a radius of 11 cm. If the water boils away at rate of0.480 kg/min, what is the temperatureof the lower surface of the bottom of the kettle? Assume that the..
If an isolated conducting sphere 10 cm in radius has a net charge of +7.9 µC, what is the potential on the surface of the sphere
A small button placed on a horizontal rotating platform with diameter 0.326m will revolve with the platform when it is brought up to a rotational speed of 43.0rev/min, How far from the axis can the button be placed, without slipping,
a fire hose exerts a force on the person holding it. this is because the water accelerates as it goes from the hose
A train flat car is passing a loading dock at a speed of 8.0m/s, What is the horizontal acceleration of the cargo crate as it increases speed to that of the train flat car
When a certain air-filled parallel-plate capacitor is connectedacross a battery, it acquires a charge (on each plate) of magnitude98 μC. While the battery connection is maintained, adielectric slab is inserted into the space between the capacitorplat..
Pulsed lasers used in science and medicine produce very short bursts of electromagnetic energy. how many wavelengths are found within the laser pulse
the average thermal conductivity of the walls including the windows and roof of the house depicted in the figure below
Microcontrollers usually do not include D/A converters but you can easily create a crude version of one usually signle digital I/O pin. This can be done by outputting a variable-width pulse train to an RC circuit.
Vertically polarized light with an intensity of 0.40 W/m2 passes through a polarizer whose transmission axis is at an angle of 55 degrees with the vertical
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