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A piñata of mass 3.50 kg is attached to a string tied to a hook in the ceiling. The length of the string is 0.78 m, and the piñata is released from rest from an initial position in which the string makes an angle of 56.4° with the vertical. What is the work done by gravity by the time the string is in a vertical position for the first time?
A 52kg ballet dancer stands on her toes during a performance with four square inches (26cm2) in contact with the floor. What is the pressure exerted by floor over the area of contact in some cases.
Calculate the acceleration on the radio. The rms voltage across a 5.02 Ω resistor is 34.7 V. Find the maximum instantaneous current by the resistor.
A certain particle has the life time of 10^-7 s, while measured at rest. How far does it go before decaying if its speed is 0.99 c when it is created.
In an experiment, 200 g of aluminum (with a specific heat of 900 J/kg·K) at 100°C is mixed with 48.0 g of water (4186 J/kg·K) at 20°C, What is the entropy change of the aluminum
You have a 1.0m long copper wire. You want to make an N-turn current loop that generates a 1.2mT magnetic field at the center when the current is 2.5A. What will be the diameter of your coil
A rectangular container measuring 10cmx20cmx25cm is filled with gas. What is the mass volume of water in kilograms.
A battery with an emf of 12.0 V shows a terminal voltage of 11.0V when operating in a circuit with two lightbulbs rated, What is the battery's internal resistance
Find out the angular velocity at the beginning of the 4.60 interval; the angular acceleration of the flywheel.
A simple pendulum consists of a small object of mass m (the "bob") suspended by a cord of length l of negligible mass. A force F is applied in the horizontal direction (so F is Fi), Determine the work done by the gravitational force on the bob
Using the data calculate the average speed of blood flow in the major arteries of the body which have a total cross-sectional area of about 2.0 cm2.
A musician plays a string on a guitar that has a fundamental frequency of 330.0 Hz. The string is 65.2 cm long and has a mass of 0.268 g. At what speed do the waves travel on the string
A dentist uses a mirror to examine a tooth that is 1.25 cm in front of the mirror. The image of the tooth is formed 5.0 cm behind the mirror. Determine the mirror's radius of curvature
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