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A metal worker in a foundry needs to melt aluminum. Thealuminum (3.5 kf) is at room temperature (20 C). How much energy inJoules is needed to melt the aluminum?
A spring has of constant k=1200 N/m is compressed by 8.0cm. A 2.5kg block is placed against the compressed spring. find the resulting kinetic energy and speed of the block
A car with 52cm -diameter tires accelerates uniformly from rest to 20m/s in 10s. How many ties does each tire rotate
A mass-spring system oscillates with an amplitude of 4.40 cm. If the spring constant is 237 N/m and the mass is 411 g, Determine the maximum speed of the object
What is the wavelength of the reflection minimum?
q1. an ocean liner leaves new york city and travels 37.0deg north of east for 171 km. how far east and how far north
Communications satellites are placed in a circular orbit where they stay directly over a fixed point on the equator as the earth rotates. find the period of a satellite in a geosynchronous orbit
The intensity of the sound wave from a jet airplane as it is taking off is 105 W/m2 at a distance of 3.2 m. What is the intensity of the sound wave
A sled is pulled with a horizontal force of 20 N along a level trail, and the acceleration is found to be 0.35 m/s2. An extra mass m = 4.2 kg is placed on the sled. If the same force is just barely able to keep the sled moving, what is the coeffic..
A crate of 45.2-kg tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it and observe that the crate just begins to move when your force exceeds 310N. find the coefficient of static friction between the crate and ..
A spherical conducting shell has an interior radius of 18 cm and an outer radius of 21cm. The shell carries a net charge of -2.4 micro coulombs. A point charge of charge +6.4 micro coulombs is placed at the center of spherical shell.
A ball is thrown straight upward in the air at a speed of 18.0 m/s, What is the maximum height the ball will reach
Classical Mechanics: Projectile Motion, A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.80 m/s at an angle of 21.0° below the horizontal. It strikes the ground 3.00 s later.
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