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a roller coaster car is at the top of a "loop-de-loop" and is at the point where it is upside down. Not ignoring air resistance, assume the car is moving rapidly enough to remain in firm contact with the rails. Why is there no outward force on the car?
When a potential difference of 172 V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of 23.0 nC/cm2
Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8 ? 1011 solar masses. What should the orbital period of that star be
A real heat engine working between heat reservoirs at 970. K and 650. K produces 550. J of work per cycle for heat input of 2200. J. Calculate the total entropy change of the universe
A man pushes a wooden crate on wooden floor. The direction of the force is 30o downward relative to the horizontal, How much force does he use in order to maintain a constant speed
The index of refraction for violet light in silica flint glassis 1.66, and that for red light is 1.62. What is the angulardispersion of visible light passing by an equilateral prism ofapex angle 60.0° if the angle of incidence is 50°.
A bedroom bureau with a mass of 40 kg, including drawers and clothing, rests on the horizontal floor. What is the static friction force on the bureau initially
A child launches an air powered toy rocket up into the air giving it an initial velocity of 6m/s at an angle of 80degree above the horizontal. How long after the rocket is launched does it take for the rocket to hit the ground
With brakes fully applied, a 1430kg car decelerates from a speed of 74km/hr. What is the work done by the braking force in bringing car to a stop.
Bailey is trying to save a young girl under a 15 m long wooden beam. She lifts the beam up from one side with a force of 25 N using her nose. find the magnitude of the torque that Bailey puts on the beam
A circular coil of wire with 200 turns and a radius of 30 cm is laying flat on a horizontal wooden table. find the magnitude of the magnetic flux through the coil
A skateboarder shoots off a ramp with a velocity of 6.6 m/s, directed at an angle of 58 degrees above the horizontal. how far is this point horizontally from the end of the ramp
Five seconds later, the police officer leaves on her motorcycle, starts her stopwatch, and accelerates at 2 m/s^2 toward the car. According to her stopwatch, how many seconds until she catches the car
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