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A person of mass 80.0kg stands at the center of a rotating merry-go-round platform of radius 2.50m and moment of inertia 910kg*m^2 . The platform rotates without friction with angular velocity 2.20rad/s . The person walks radially to the edge of the platform.
A. Calculate the angular velocity when the person reaches the edge.
B. Calculate the rotational kinetic energy of the system of platform plus person before and after the person's walk.
A 2.5hp electric motor on a water well pumps water from 10m below the surface. The density of water is 1.0 kg per liter. How many liters of water does the motor pump in 2.0hr
An 0.8kg baseball with an initial velocity of 40m/s is hit with a baseball bat so that its recoil velocity is 60m/s in the exact opposite direction. what is the average force the bat puts on the ball
In a period of 1 s, 4.00 x10^23 nitrogen molecules strike a wall with an area of 6.30 cm2. If the molecules move with a speed of 300 m/s and strike wall head-on in elastic impacts, what is the pressure exerted on the wall? (The mass of one N2 mole..
An AC generator has 80 rectangular loops on its armature. Each loop is 11 cm long and 10 cm wide. calculate the maximum output voltage of this generator
For light that originates within a liquid and strikes the liquid/air interface, What is Brewster's angle for this light
Two red blood cells each have a mass of 9.05 × 10-14 kg and carry a negative charge spread uniformly over their surfaces. What is the maximum accleration of the cells as they move toward each other and just touch
A uniform, cylindrical pulley of mass M=12.7 kg and radius R=0.636 m rotates freely about a fixed horizontal axis. obtain the magnitude of the angular acceleration of the pulley
Guns on World War II battleships could shell targets 15 km away. Find (a) the minimum launch speed needed to achieve that range and (b) the shell s flight time under these conditions
A string is wrapped around a pulley with a radius of 2.0cm. The pulley is initally at rest. What is the moment of inertia of the pulley
If a 4-engine jet accelerates down the runway at 5m/s2 and 3 of the jet engines fail, how much acceleration will the other one produce.
John starts at the origin and walks 3.0 km due east. If he then walks 30? north of east for 8.0 km, what is his distance from the origin (in km)
A truck starts out at position x = 2.7 mi and y = 5.4 mi and winds up at position x = 4.5 mi, y = 2.2 mi. The truck made the displacement in 11 minutes. Find the average velocity of the truck in miles per hour
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