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Lead pellets, each of mass 1.20 g, are heated to 200°C. How many pellets must be added to 450 g of water that is initially at 20.0°C to make the equilibrium temperature 25.0°C? Neglect a
A model rocket rises with constant acceleration to a height of 3.7 , at which point its speed is 25.0 What was the magnitude of the rocket's acceleration?
A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 4.60 rev/s while rotating through three-fourths of a revolution. H
Assuming that no energy is lost by heat to the surroundings, determine the total entropy change of the horseshoe-plus-water system.
A 535 g ball swings in a vertical circle at the end of a 1.4 m-long string. When the ball is at the bottom of the circle, the tension in the string is 22 N. What is the speed of the ball at that poi
To determine if the ball clears the cross-bar, what is its height with respect to the crossbar when it reaches the plane of the crossbar?
A child of mass 25kg stands at a distance of 1m from the axle. The child then proceeds to walk toward the edge of the merry go round. What is the new angular speed of the system when the child reach
On July 15, 2004, NASA launched the Aura spacecraft to study the earth's climate and atmosphere. How many hours does it take this satellite to make one orbit?
A 5 m wide dam holds back a 6 m deep lake with only air on the other side. What is the net force on the dam?
The Celsius thermometer reads -40 degrees; Celsius and the Kelvin thermometer read 233K. Which of the following statements is necessarily true?
The child then proceeds to walk toward the edge of the merry-go-round. What is the angular speed of the system when the child reaches the edge?
Three point charges, -5.7 x 10-9 C, -9.3 x 10-9 C, and +7.3 x 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -1700 V. What is the
Which of the two, the first one the train passes (guy A) or the second (guy B), should be arrested for firing the first shot?
An antitank weapon fires a 3.00 kg rocket which acquires a speed of 50.0 m/s after traveling 90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force
Two skaters, both of mass 75 kg, are on skates on a frictionless ice pond. One skater throws a .3 kg ball at 5 m/s to his friend, who catches it and throws it back at 5 m/s. When the first skater ha
A charge of -5.5 micro-Coulombs is placed at the origin of a coordinate system. Another charge of -5.5 micro-Coulombs is placed at x = +0.22 m, y = +0.15 m. A third charge of +6.9 micro-Coulombs is
A second light source with 1/2 the wavelength of the first ejects photoelectrons with a maximum kinetic energy of 5.27eV. What is the work function of the metal?
A 20.0 kg floodlight in a park is supported at the end of a horizontal beam of mass 20.0 kg. Find the horizontal and vertical forces exerted by the beam on the pole.
Calculate the angular velocity when the person reaches the edge. Calculate the rotational kinetic energy of the system of platform plus person before and after the person's walk.
The mass of the rope is 2.50 . The geologist at the bottom of the mine signals to his colleague at the top by jerking the rope sideways. (Do not neglect the weight of the rope.)
The car first encounters a minimum in reception after it travels 124.0 m. What is the wavelength of the radio waves? Assume that the car and the transmitters are all at the same altitude.
A Fabry-Perot interferometer is to be used to resolve the mode structure of a He-Ne laser operating at 632.8 nm. What is the free spectral range of the instrument under these conditions?
What is the magnitude of the total electrostatic energy of the final 5 charge system? It may be useful to consider the symmetry property of the charge distribution which leads to cancellations amon
If the angular acceleration of the wheel is constant during the motion, how long will it take the wheel to make the one-half revolution? Please provide step-by-step method to solving the problem.
The mover pulls the dolly with constant velocity and with a steady force of 497 N up the ramp. The dolly and ramp constitute a machine. The acceleration of gravity is 9.8 m/s2 . What work does the m