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An astronaut arrives at a new planet, and gets out his simple device to decide the gravitational acceleration there. Prior to this arrival, he noted that the radius of the planet was 6940 km. If his 0.600-m-long pendulum has a period of 1.0 s, what is the mass of the planet?
A flower pot falls from the ledge of a building. A person in an apartment below, coincidentally holding a stopwatch, notices it takes 0.7s for the pot to fall past his window, which is 18m high. g=9.81m/s2. How far above the top of the window is t..
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
Two blocks, one of 50 g and the other of 46 g, are connected by a string and hung over a frictionless pulley which has a radius of 5 cm. What is the moment of inertia of the pulley
A 1.10-mol sample of hydrogen gas is heated at constant pressure from 304 K to 422 K. Calculate the increase in its internal energy
the coefficient of static friction for aluminum on steel is 0.61 and for copper on steel is 0.53. an aluminum block of
A blue puck with a mass of 4.30×10?2kg , sliding with a speed of 0.190m/s on a frictionless, horizontal air table, Find the direction of the velocity of the red puck after the collision
A spring (k = 812 N/m) ishanging from the ceiling of an elevator, and a 4.8 kg object is attached to the lower end. By how much does the spring stretch
Estimation instantaneous rate of evaporation
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 bowling ball and a silver dollar are rolled down a 15 degrees incline which is 5 meters long. Calculate the final linear speed of the silver dollar
The axis of a cylindrical container is vertical. The container is filled by equal masses of water and oil. The oil floats on top of the water, and the open surface of the oil is at a height above the bottom of the container.
light traveling in air is incident on the surface of a block of plastic at an angle of 72.7deg to the normal and is
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