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1) What is the new angular speed?
2) Find the change in kinetic energy of the block.
3) How much work was done in pulling the cord? A small block on a frictionless, horizontal surface has a mass of 2.50x10-2kg .
It is attached to a massless cord passing through a hole in the surface (the figure ). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 1.65rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a particle.
A flat surface with area 1.6 m2 is in a uniform electric field of 560 N/C. What is an electric flux through the surface when it is oriented as follows.
a juggler traveling in a train on level track throws a ball straight up relative to the train with a speed of 6.65 ms.
In an experiment the speed of sound in air, a student a measures a column of air in a resonance tube. find the speed of sound in the room
At a certain instant a particle (mass=0.5 kg) is moving in the +x direction with velocity 14 m/s. What is the magnitude of the momentum of the particle (in kg*m/s) at the end of this 0.15 second interval
A 70 kg man (rad=0.25m) standing on a 10-kg disc (rad=0.4m) with his arms extended (rad=0.9m) holding a 15-kg weight in each hand. What is the rotational inertia of man with weights.
A rat with an emissivity of .40, total area of .15m^2 and a temperature of 37C. How much energy must the rat's body generate to maintain a skin surface of 37C in a 24 hour period
Find the average molecular weight and specific gas constant for moist air saturated with water vapor at 0 degrees Celsius and 1000hPa of total pressure
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 11-g nail
Two resistors are connected in a series to a 15V battery. The voltage drop across the first resistor is 3.5V, What is the resistance of the two resitors
a sample of serum has a mass of 54 mg and a volume of 225 cm3. what is its density in gcm3? what would be the mass of
a railroad engine weighs three times as much as a freight car. if the engine coasts at 9 km per hour into a freight
In the process of changing a flat tire, a motorist uses a hydraulicjack. She begins by applying a force of 45 N to the input piston,which has a radius r1. obtain the force that the output plunger applies to the car
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