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A 1.00 kg block of copper at 20.0°C is lowered into a large insulated container of liquid ammonia at its boiling point (-33.3°C). If the specific heat of copper is 387 J/kg°C and heat of vaporization of liquid ammonia is 1371 kJ/kg, determine the mass of liquid ammonia that boils away before thermal equilibrium. Assume an excessive amount of liquid ammonia is present and that the liquid ammonia does not react with the copper.
Two charges, q1 and q2, are separated by a distance, r, and exert a force, F, on each other. What will the new force be if:
A railroad car of mass 40900 kg moving at 3.35m/s collides and couples with two railroad cars,each of the same mass as the single car and moving in the same direction at 1.53m/s. what is the speed of three cars after the collision.
The maximum distance from Earth to the Sun (at our aphelion) is 1.521 x 10^11 m and the distance of closest approach (at perihelion) is 1.471 x 10 ^11 m. Assume the Earth's orbital speed at perihelion is 3.027 x 10 ^ 4 m/s. (overlook the effect of th..
The cockroach's speed (relative to the ground) is 2.0 m/s, and the lazy Susan turns clockwise with angular velocity ω0 = 3.2 rad/s. The cockroach find out a bread crumb on the rim and, of course, stops.
Two cars are travelling on a desert road. After 5s, they are side by side at the next telephone pole. The distance between the poles is 70m.
A loudspeaker of mass 21.0 {rm kg} is suspended a distance of h = 2.40 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has the length of l = 3.90 {rm m}.
The yellow light from a helium discharge tube has a wavelength of 587.50. When this light illuminates a certain diffraction grating it produces a first-order principal maximum at an angle of 1.050.
Two long, parallel conductors carry currents I1 = 3.10 A and I2 = 5.10 A, both directed into the plane of the computer screen. Find out the magnitude and direction of the resultant magnetic field at a point midway between the wires. (b) Find out the ..
find the work done by the field on the electron. What is the change in potential energy associated with the electron.
The altitude of a hang glider is increasing at a rate of 6.80 m/s. At the same time, the shadow of the glider moves along the ground at a speed of 15.5 m/s when the sun is directly overhead. Calculate the magnitude of the glider’s velocity.
A wave on a Slinky has a frequency of 1.69 Hz. It takes 4.1 s to travel the length of the Slinky (0.29 m). What is the wavelength.
Determine the resolution limit set by diffraction . what average force do you need to apply to stop the sled? Utilize the concepts of impulse and momentum.
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