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Two thermally insulated reservoirs each contain 2 kg of water at temperatures of 80 °C and 20 °C respectively. The two quantities of water are mixed in one of the containers without heat transfer to the surroundings and are allowed to reach equilibrium. Determine the find equilibrium temperature and find the change in entropy of the local universe in the mixing process. The specific heat water is 4.18 J g-1 K-1.
A 30-06 caliber hunting rifle fires a bullet of mass 0.0146 kg with the velocity of 314 m/s to the right. The rifle has a mass of 2.49 kg.
A spacecraft is traveling with a velocity of vox = 5675 m/salong the +x direction. Two engines are turned on for a time of 847 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.25 m/s2,while the other gives it an acc..
A somewhat longer cable replaces the old and is attached to the steel bar 5 m from its upper end, connecting to the same place on the wall as before and maintaining the same angle between the bar and the wall.
A robot probe drops a camera off the rim of a 239m high cliff on Mars, where the free fall acceleration is -3.7m/s^2. Find out the velocity with which the camera hits the ground.
Team B is pulling on a rope attached to the same anvil with the same force but in direction of 32 degrees S of E. What is the initial acceleration of the anvil.
what horizontal force is required to move the crate. If the coefficient of kinetic friction between a 33 kg crate and the floor is 0.26, what horizontal force is required to move the crate at a steady speed across the floor? Which is 84 I just help..
The emissivity of tungsten is 0.350. A tungsten sphere with a radius of 1.19 is suspended within a large evacuated enclosure whose walls are at a temperature of 285.0 . What power input is needed to maintain the sphere at a temperature of 2500.0 i..
A 3.10 kg steel ball strikes a wall with a speed of 10 m/s at an angle of 60 ° with the surface. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.190 s, what is the average force exerted on the ball by th..
An inquisitive physics student and mountain climber climbs a 55 m cliff that overhangs a calm pool of water. She throws two stones vertically downward 0.8 s apart and observes that they cause a single splash.
With what velocity would they be separating after the collision.
Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of an ultrasound waves themselves. What is a size of the smallest feature observable in human tissue while examined with 25 MHz ultrasound? The speed of..
Assume that the earth is a uniform density spherical mass. (This assumption is not correct but we will use it for simplicity in working the problem.)
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